Laser Obstacle Ranging and Display

• US 20090262760A1
• Filed: 07/20/2007
• Published: 10/22/2009
• Est. Priority Date: 01/20/2005
• Status: Active Grant

• Current Assignee: Elbit Systems Electro-Optics ELOP Limited (Elbit Systems Limited)
• Original Assignee: Elbit Systems Electro-Optics ELOP Limited (Elbit Systems Limited)
• Inventors: Luria, Elena, Shoshan, Itamar, German, Alla, Sarid, Moshe, Yaniv, Avishay, Zajdman, Avigdor, Krupkin, Vladimir
• Granted Patent: US 7,847,235 B2
• Time in Patent Office: Days
• US Class Current: 372/6
• CPC Class Codes: G01S 13/18 wherein range gates are used
• CPC Class Codes: G01S 13/22 using irregular pulse repetition frequency G01S13/12 takes precedence
• CPC Class Codes: G01S 17/04 Systems determining the presence of a target
• CPC Class Codes: G01S 17/933 of aircraft or spacecraft
• CPC Class Codes: G01S 7/414 Discriminating targets with respect to background clutter
• CPC Class Codes: G01S 7/4817 relating to scanning
• CPC Class Codes: G01S 7/4818 using optical fibres
• CPC Class Codes: G01S 7/484 Transmitters
• CPC Class Codes: G01S 7/4868 Controlling received signal intensity or exposure of sensor
• CPC Class Codes: G01S 7/487 Extracting wanted echo signals , e.g. pulse detection
• CPC Class Codes: H01S 3/00 Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range semiconductors lasers H01S5/00
• CPC Class Codes: H01S 3/0007 Applications not otherwise provided for working metals or other materials by laser beam B23K26/00; using photons to produce a reactive propulsive thrust F03H3/00; optical recording of measured values in general G01D15/14; optics in general G02B; holographic processes or apparatus G03H; optical marking or sensing of data record carriers G06K7/10 - G06K7/14, G06K15/12; injection heating of plasma by laser H05H1/22; acceleration of neutral particles by electromagnetic wave pressure H05H3/04
• CPC Class Codes: H01S 3/067 Fibre lasers
• CPC Class Codes: H01S 3/06754 Fibre amplifiers H01S3/06708 takes precedence
• CPC Class Codes: H01S 3/06758 Tandem amplifiers
• CPC Class Codes: H01S 3/094007 Cladding pumping, i.e. pump light propagating in a clad surrounding the active core
• CPC Class Codes: H01S 3/094011 with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre
• CPC Class Codes: H01S 3/1608 erbium
• CPC Class Codes: H01S 3/1618 ytterbium
• CPC Class Codes: H01S 3/2333 Double-pass amplifiers

Abstract

Apparatus, for detecting at least one object and preventing receiver burn-out, mounted on a vehicle, including a laser and at least one receiver, the receiver being coupled with the laser, the laser for transmitting a beam of light and the receiver for detecting reflections of the beam of light from the object, the laser including at least one signal diode, a commutator, a power supply signal diode driver, a circulator, an erbium doped fiber (EDF), a wavelength division multiplexer (WDM), a narrow band Bragg reflector, a first fiber pump diode, an output combiner and a second fiber pump diode, the commutator being coupled with each signal diode and the power supply signal diode drive, the circulator being optically coupled with each signal diode, the EDF and the output combiner, the WDM being optically coupled with the EDF, the narrow band Bragg reflector and the first fiber pump diode and the second fiber pump diode being optically coupled with the output combiner, each signal diode generating a beam of light distinct from one another, the power supply signal diode driver for supplying energy to each signal diode, the circulator for directing the beam of light in at least one of at least two different directions, the EDF for amplifying the beam of light thereby producing an amplified beam of light, the narrow band Bragg reflector for reflecting only the amplified beam of light through the EDF a second time, thereby producing a double amplified beam of light and the first fiber pump diode and the second fiber pump diode for pumping the EDF, wherein the WDM and each of the signal diodes are located on opposite sides of the EDF, wherein the output combiner outputs the beam of light, wherein the commutator enables each signal diode, one at a time, to draw a predetermined amount of energy from the power supply signal diode driver, wherein one signal diode generates a low energy beam of light and another one generates a high energy beam of light, wherein the low energy beam of light is transmitted by the output combiner before the high energy beam of light, and when the low energy beam of light is detected by the receiver, and the energy level of the low energy beam is above a predetermined threshold, the high energy beam of light is not transmitted.

Claims

1. Fiber laser, for detecting at least one object, comprising:

at least one signal diode, said at least one signal diode generating at least one beam of light;

a circulator, optically coupled with said at least one signal diode, for directing said at least one beam of light in at least one of at least two different directions;

an erbium doped fiber (EDF), optically coupled with said circulator, for amplifying said at least one beam of light thereby producing at least one amplified one beam of light;

a wavelength division multiplexer (WDM), optically coupled with said EDF;

a delay line, optically coupled with said WDM;

a narrow band reflector, optically coupled with said delay line, for reflecting only said at least one amplified beam of light back through said EDF a second time, thereby producing at least one double amplified beam of light;

a first fiber pump diode, optically coupled with said WDM, for pumping said EDF;

an input combiner, optically coupled with said circulator;

an erbium-ytterbium co-doped fiber (EYDF), optically coupled with said input combiner, for amplifying said at least one double amplified beam of light, thereby producing at least one triple amplified beam of light;

a second fiber pump diode, optically coupled with said input combiner, for pumping said EYDF;

an output combiner, optically coupled with said EYDF; and

a third fiber pump diode, optically coupled with said output combiner, for pumping said EYDF,

wherein said WDM and said at least one signal diode are located on opposite sides of said EDF,

wherein said output combiner outputs said at least one triple amplified beam of light.

2. The fiber laser according to claim 1, wherein an erbium-ytterbium co-doped fiber can be substituted for said EDF.

3. The fiber laser according to claim 1, further comprising a first band pass filter (BPF), optically coupled with said circulator and said input combiner, for suppressing spontaneous light emissions that result from said EDF.

4. The fiber laser according to claim 1, further comprising:

at least one thermoelectric cooler, coupled with said fiber laser;

a heat sink, coupled with said fiber laser; and

an external forced air unit, coupled with said fiber laser,

wherein said at least one thermoelectric cooler, said heat sink and said external forced air unit cool said fiber laser.

5. The fiber laser according to claim 1, wherein the operational wavelength of said at least one signal diode ranges from 1.5 to 2.3 micrometers.

6. The fiber laser according to claim 1, wherein the pulse width of said generated at least one beam of light ranges from a 3 nanoseconds to 2000 nanoseconds.

7. The fiber laser according to claim 1, wherein the bandwidth of said at least one signal diode is narrow.

8. The fiber laser according to claim 1, wherein the bandwidth of said at least one signal diode and said narrow band reflector are substantially similar.

9. The fiber laser according to claim 1, wherein the delay of said delay line is equal to or greater than the pulse width of said at least one beam of light.

10. The fiber laser according to claim 1, wherein the frequency at which said at least one beam of light is generated by said at least one signal diode ranges from one kilohertz to one thousand kilohertz.

11. The fiber laser according to claim 1, wherein the energy of said generated at least one beam of light is on the order of tens of microwatts.

12. The fiber laser according to claim 1, wherein said narrow band reflector is a narrow band Bragg reflector.

13. The fiber laser according to claim 1, wherein said narrow band reflector is a fiber Bragg grating.

14. The fiber laser according to claim 1, wherein the operational wavelengths of said first fiber pump diode, said second fiber pump diode and said third fiber pump diode ranges from 910 nanometers to 985 nanometers.

15. The fiber laser according to claim 1, wherein said first fiber pump diodes pumps said EDF with at least one beam of light on the order of hundreds of milliwatts.

16. The fiber laser according to claim 1, wherein said second fiber pump diode comprises at least one fiber coupled laser diode.

17. The fiber laser according to claim 1, wherein said third fiber pump diode comprises at least one fiber coupled laser diode.

18. The fiber laser according to claim 1, wherein said second fiber pump diode pumps said EYDF with at least one beam of light on the order of tens of watts.

19. The fiber laser according to claim 1, wherein said third fiber pump diode pumps said EYDF with at least one beam of light on the order of tens of watts.

20. The fiber laser according to claim 1, wherein said EYDF comprises a double clad erbium-ytterbium fiber.

21. The fiber laser according to claim 1, wherein said second fiber pump diode pumps one end of said EYDF and said third fiber pump diode pumps the other end of said EYDF.

22. The fiber laser according to claim 1, wherein said EDF is a single mode fiber amplifier.

23. The fiber laser according to claim 1, wherein said EYDF is a multimode fiber amplifier.

24. The fiber laser according to claim 1, wherein at least one of said input combiner and said output combiner comprises at least one collimating lens and at least one focusing lens, for focusing and directing said at least one amplified beam of light.

25. The fiber laser according to claim 1, wherein at least one of said input combiner and said output combiner comprises at least one dichroic mirror, for combining said at least one amplified beam of light with the light generated by said second fiber pump diode and said third fiber pump diode.

26. The fiber laser according to claim 1, wherein at least one of said input combiner and said output combiner comprises at least one protective filter, for protecting said second fiber pump diode and said third fiber pump diode from laser light damage.

27. The fiber laser according to claim 26, wherein said at least one protective filter is a band pass filter (BPF).

28. The fiber laser according to claim 1, further comprising an optical assembly, coupled with said output combiner, for directing and focusing said at least one triple amplified beam of light towards a volume of interest.

29. The fiber laser according to claim 1, wherein the components of said fiber laser are optically coupled by fiber optics.

30. The fiber laser according to claim 1, wherein the length of said EDF is in accordance with the characteristic absorption length of erbium doped fibers.

31. The fiber laser according to claim 1, wherein the length of said EYDF is double the length of the characteristic absorption length of erbium-ytterbium co-doped fibers.

32. The fiber laser according to claim 1, further comprising:

at least one receiver, coupled with said fiber laser, for detecting reflections of said at least one beam of light from said at least one object,

said fiber laser further comprising;

a commutator, coupled with each of said at least one signal diode; and

a power supply signal diode driver, coupled with said commutator, for supplying energy to each of said at least one signal diode,

wherein said fiber laser is mounted on a vehicle,

wherein said fiber laser is enabled to prevent receiver burn-out,

wherein each said at least one signal diode generates at least one beam of light distinct from another one of said at least one signal diode,

wherein said commutator enables each of said at least one signal diode, one at a time, to each draw a predetermined amount of energy from said power supply signal diode driver,

wherein one of said at least one signal diode generates at least one low energy beam of light and another one of said at least one signal diode generates at least one high energy beam of light,

wherein said at least one low energy beam of light is transmitted by said output combiner before said at least one high energy beam of light, and

wherein when said at least one low energy beam of light is detected by said receiver, and the energy level of said low energy beam is above a predetermined threshold, said at least one high energy beam of light is not transmitted.

33. The fiber laser according to claim 32, wherein when said at least one low energy beam of light is detected by said receiver in a predetermined time period, said at least one high energy beam of light is not transmitted.

34. The fiber laser according to claim 32, further comprising a scanner, optically coupled with said fiber laser, for directing said at least one beam of light to a volume of interest in which said at least one object may be present.

35. The fiber laser according to claim 32, further comprising an indicator, coupled with said receiver, for providing an indication of said at least one object to a user when said at least one receiver detects reflections of said at least one beam of light from said at least one object.

36. The fiber laser according to claim 35, wherein said indication is selected from the list consisting of:

visual indication;

audible indication; and

tactile indication.

37. The fiber laser according to claim 32, further comprising an image processing unit, coupled with said at least one receiver, for generating an image of said volume of interest, from the various intensities of all the reflections of said at least one beam of light from said at least one object.

38. The fiber laser according to claim 32, wherein the distinction between said generated beams of light is selected from the list consisting of:

different wavelengths;

different pulse widths;

different types of polarization;

different amplitudes;

different pulse frequencies;

different generation times; and

different frequency modes.

39. The fiber laser according to claim 32, wherein the distinction between said generated beams of light comprises different generation times, and

wherein the difference in time between said different generation times is on the range of tens to hundreds of microseconds.

40. The fiber laser according to claim 32, wherein the distinction between said generated beams of light comprises different frequency modes.

41. The fiber laser according to claim 40, wherein said different frequency modes comprises a single frequency mode.

42. The fiber laser according to claim 40, wherein said different frequency modes comprises a multi-frequency mode.

43. The fiber laser according to claim 41, wherein said at least one signal diode operating in said single frequency mode is selected from the list consisting of:

signal diode;

single frequency fiber laser; and

solid state laser.

44. The fiber laser according to claim 42, wherein said at least one signal diode operating in said multi-frequency mode is selected from the list consisting of:

a signal diode;

a fiber laser oscillator; and

a solid state laser oscillator.

45. The fiber laser according to claim 32, wherein said commutator allows each of said at least one signal diode to draw the same amount of energy from said power supply signal diode driver simultaneously.

46. The fiber laser according to claim 45, wherein said output combiner outputs said at least one beam of light generated by each of said at least one signal diode simultaneously.

47. The fiber laser according to claim 32, further comprising:

an optical assembly, for transmitting said at least one beam of light, wherein said output combiner is coupled with said optical assembly, and

wherein said output combiner comprises an opto-mechanical interface for transmitting said at least one beam of light to said optical assembly.

48. The fiber laser according to claim 32, further comprising:

a hardware controller, coupled with said fiber laser, for coordinating and synchronizing the operation of said fiber laser;

a transceiver optics, coupled with said fiber laser, for aligning said generated at least one beam of light and a received reflected at least one beam of light, reflected from said at least one object, onto a common optical axis;

an optical receiver, coupled with said transceiver optics and with said hardware controller, for receiving said reflected at least one beam of light and for providing said hardware controller with information indicative of the characteristics of said reflected at least one beam of light;

a scanner, coupled with said transceiver optics and with said hardware controller, for scanning a volume of interest in front of said vehicle and for directing said reflected at least one beam of light towards said transceiver optics;

a scanner driver, coupled with said scanner and with said hardware controller, for mechanically setting the mode of operation of said scanner;

a processor, coupled with said hardware controller, for setting said fiber laser to a certain mode of operation and for instructing said hardware controller to set said scanner driver to an appropriate mode of operation;

an inertial navigation system (INS), coupled with said processor, for continuously detecting the motion of said vehicle, in real-time, and for providing said detected motion to said processor;

a user interface, coupled with said processor, for allowing a user to operate said fiber laser, and to set the characteristics of said fiber laser for a given operation scenario;

a voice management unit, coupled with said processor, for conveying information to a user of said vehicle;

a helmet mounted display (HMD) symbol generator, coupled with said processor, for conveying information to said user;

a global positioning system (GPS), coupled with said processor, for continuously detecting the position of said vehicle, and for providing said detected position to said processor; and

a power supply, coupled with said fiber laser, said hardware controller and with said processor, for providing electrical power to said fiber laser, said hardware controller and to said processor,

wherein said hardware controller coordinates and synchronizes the operation of said scanner driver and said processor, sets said fiber laser to said certain mode of operation, according to said characteristics of said reflected at least one beam of light, and provides said processor with information regarding a possible hazard to said vehicle when said characteristics of said reflected at least one beam of light indicates that said at least one object, from which said reflected at least one beam of light reflected from, is an obstacle presenting a possible hazard to said vehicle,

wherein said transceiver optics transmits said at least one beam of light to said scanner,

wherein said processor uses said detected motion to determine said appropriate mode of operation for said scanner driver and to determine said certain mode of operation for said fiber laser,

wherein said HMD symbol generator indicates the presence of said possibly hazardous obstacle in the path of said vehicle, to said user through a visual effect,

wherein said voice management unit indicates the presence of said possibly hazardous obstacle in the path of said vehicle, to said user through an acoustic effect, and

wherein said HMD symbol generator and said voice management unit provides said user with information regarding the location and the nature of said possibly hazardous obstacle, as received by said processor.

49. The fiber laser according to claim 48, wherein said scanner scans a volume of interest in front of said vehicle, said volume of interest located a predetermined distance in front of said vehicle.

50. The fiber laser according to claim 48, further comprising:

an altimeter, coupled with said processor, for detecting the altitude of said vehicle and for providing said detected altitude to said processor; and

a weight sensor, coupled with the wheels of said vehicle and with said processor, for detecting the weight on said wheels and for providing said processor with said detected weight,

wherein said altimeter and said GPS are used to increase the accuracy of said detected motion of said vehicle detected by said INS,

wherein said processor uses said detected weight to determine the flight state of said vehicle, and

wherein said weight sensor increases the operational safety of said fiber laser by preventing the use of said fiber laser if said vehicle is not in flight.

51. The fiber laser according to claim 48, wherein said transceiver optics comprises a plurality of optical elements selected from the list consisting of:

a beam combiner;

a telescope; and

a deflecting mirror.

52. The fiber laser according to claim 48, wherein said acoustic effect comprises a beeping sound.

53. The fiber laser according to claim 48, wherein said acoustic effect comprises a human voice.

54. The fiber laser according to claim 1, further comprising:

at least one receiver, for receiving reflections of said at least one beam of light from said at least one object;

a reflecting-transmitting plate, optically coupled with said at least one receiver, for reflecting one of said at least one beam of light towards one of said at least one receiver, and transmitting said another one of said at least one beam of light towards another one of said at least one receiver; and

an optical assembly, optically coupled with said fiber laser and with said reflecting-transmitting plate, for transmitting and receiving said at least one beam of light,

wherein each of said at least one beam of light is transmitted at a different time.

55. The fiber laser according to claim 54, wherein said at least one beam of light is distinct compared to said another one of said at least one beam of light in wavelength.

56. The fiber laser according to claim 54, wherein said at least one beam of light is directed towards a different section of a volume of interest than said another one of said at least one beam of light.

57. The fiber laser according to claim 1, wherein said at least one beam of light is a transmitted pulsed beam of light, and wherein said fiber laser is enabled to distinguish between a pulsed light reflection from said at least one object and a pulsed light reflection from clutter, said fiber laser further comprising:

at least one receiver, for receiving reflections of said pulsed beam of light from said at least one object and said clutter;

a pulse width detector, coupled with said at least one receiver, for detecting the pulse width of said pulsed light reflection; and

a processor, coupled with said pulse width detector and with said at least one receiver, for distinguishing between said pulsed light reflection from said at least one object and said pulsed light reflection from said clutter,

wherein said processor provides an object of interest indication when the detected width of said pulsed light reflection is substantially similar to the pulse width of said transmitted pulsed beam of light, and

wherein said processor provides a clutter indication when the detected width of said pulsed light reflection is substantially longer than the pulse width of said transmitted pulsed beam of light.

58. The fiber laser according to claim 57, wherein said pulse width detector comprises at least one notch filter, for detecting low, middle and high frequency pulse widths.

59. The fiber laser according to claim 58, wherein said at least one notch filter comprises at least one narrow band pass filter, said at least one narrow band pass filter comprising at least one RCL circuit.

60. The fiber laser according to claim 57, wherein said pulse width detector comprises a signal processor, for detecting said pulse width of said pulsed light reflection.

61. The fiber laser according to claim 57, wherein said processor can perform at least one operation selected from the list consisting of:

detecting background signals impinging upon said fiber laser;

rejecting said background signals;

detecting the time of arrival of said pulsed light reflection;

adjusting a detection threshold of said pulsed light reflections; and

selecting an optimal mode for signal processing said pulsed light reflection.

62. The fiber laser according to claim 57, wherein said processor provides a low visibility indication when the number of said clutter indications received in a time period exceeds a predetermined amount.

63. The fiber laser according to claim 57, wherein said object of interest indication and said clutter indication are graduated according to the detected width of said pulsed light reflection as compared with the pulse width of said transmitted pulsed beam of light.

83. The fiber laser according to claim 1, wherein a double clad WDM can be substituted for said input combiner.

64. Fiber laser, for detecting at least one object, comprising:

at least one signal diode, said at least one signal diode generating at least one beam of light;

a preamplifier stage, coupled with said at least one signal diode, for amplifying said at least one beam of light;

at least one additional preamplifier stage, coupled with said preamplifier stage, for additionally amplifying said at least one amplified beam of light; and

a booster stage, coupled with said at least one additional preamplifier stage, for amplifying said at least one additionally amplified beam of light,

said preamplifier stage comprising;

a circulator, optically coupled with said at least one signal diode, for directing said at least one beam of light in at least one of at least two different directions;

an erbium doped fiber (EDF), optically coupled with said circulator, for amplifying said at least one beam of light thereby producing at least one amplified one beam of light;

a wavelength division multiplexer (WDM), optically coupled with said EDF;

a delay line, optically coupled with said WDM;

a narrow band reflector, optically coupled with said delay line, for reflecting only said at least one amplified beam of light back through said EDF a second time, thereby producing at least one double amplified beam of light; and

a first fiber pump diode, optically coupled with said WDM, for pumping said EDF,

said booster stage comprising;

an input combiner, optically coupled with said at least one additional preamplifier stage;

an erbium-ytterbium co-doped fiber (EYDF), optically coupled with said input combiner, for amplifying said at least one double amplified beam of light, thereby producing at least one triple amplified beam of light;

a second fiber pump diode, optically coupled with said input combiner, for pumping said EYDF;

an output combiner, optically coupled with said EYDF; and

a third fiber pump diode, optically coupled with said output combiner, for pumping said EYDF,

wherein said WDM and said at least one signal diode are located on opposite sides of said EDF,

wherein said output combiner outputs said at least one triple amplified beam of light.

65. The fiber laser according to claim 64, wherein said at least one additional preamplifier stage comprises:

a circulator, for directing said at least one beam of light in at least one of at least two different directions;

an erbium doped fiber (EDF), optically coupled with said circulator, for amplifying said at least one beam of light thereby producing at least one amplified one beam of light;

a wavelength division multiplexer (WDM), optically coupled with said EDF; and

a fiber pump diode, optically coupled with said WDM, for pumping said EDF,

wherein said circulator in one of said at least one additional preamplifier stage is coupled with said circulator in another one of said at least one additional preamplifier stage,

wherein said circulator in the first of a chain of said at least one additional preamplifier stage is coupled with said circulator in said preamplifier stage, and

wherein said circulator in the last of a chain of said at least one additional preamplifier stage is coupled with said input combiner in said booster stage.

66. The fiber laser according to claim 64, wherein said at least one additional preamplifier stage comprises:

a circulator, for directing said at least one beam of light in at least one of at least two different directions;

an erbium doped fiber (EDF), for amplifying said at least one beam of light thereby producing at least one amplified one beam of light;

at least one wavelength division multiplexer (WDM); and

at least one fiber pump diode, each said at least one fiber pump diode respectively optically coupled with each said at least one WDM, for pumping said EDF,

wherein one of said at least one WDM is optically coupled to one side of said EDF and to said circulator,

wherein another one of said at least one WDM is optically coupled to the other side of said EDF,

wherein said circulator in one of said at least one additional preamplifier stage is coupled with said circulator in another one of said at least one additional preamplifier stage,

wherein said circulator in the first of a chain of said at least one additional preamplifier stage is coupled with said circulator in said preamplifier stage, and

wherein said circulator in the last of a chain of said at least one additional preamplifier stage is coupled with said input combiner in said booster stage.

84. The fiber laser according to claim 64, wherein said at least one additional preamplifier stage comprises:

an erbium doped fiber (EDF), for amplifying said at least one beam of light thereby producing at least one amplified one beam of light;

a wavelength division multiplexer (WDM), optically coupled with said EDF; and

a fiber pump diode, optically coupled with said WDM, for pumping said EDF,

wherein said EDF in one of said at least one additional preamplifier stage is coupled with said WDM in another one of said at least one additional preamplifier stage,

wherein said EDF in the first of a chain of said at least one additional preamplifier stage is coupled with said circulator in said preamplifier stage, and

wherein said WDM in the last of a chain of said at least one additional preamplifier stage is coupled with said input combiner in said booster stage.

67. Fiber laser, for detecting at least one object, comprising:

at least one signal diode, said at least one signal diode generating at least one beam of light;

a preamplifier stage, coupled with said at least one signal diode, for amplifying said at least one beam of light;

a splitter, coupled with said preamplifier stage, for splitting said at least one amplified beam of light into a plurality of amplified beams of light; and

at least one booster stage, each said at least one booster stage being coupled with said splitter, for amplifying respectively each one of said plurality of amplified beams of light,

said preamplifier stage comprising;

a circulator, optically coupled with said at least one signal diode and with said splitter, for directing said at least one beam of light in at least one of at least two different directions;

an erbium doped fiber (EDF), optically coupled with said circulator, for amplifying said at least one beam of light thereby producing at least one amplified one beam of light;

a wavelength division multiplexer (WDM), optically coupled with said EDF;

a delay line, optically coupled with said WDM;

a narrow band reflector, optically coupled with said delay line, for reflecting only said at least one amplified beam of light back through said EDF a second time, thereby producing at least one double amplified beam of light; and

a first fiber pump diode, optically coupled with said WDM, for pumping said EDF,

each one of said at least one booster stage comprising;

an input combiner, optically coupled with said splitter;

an erbium-ytterbium co-doped fiber (EYDF), optically coupled with said input combiner, for amplifying said at least one double amplified beam of light, thereby producing at least one triple amplified beam of light;

a second fiber pump diode, optically coupled with said input combiner, for pumping said EYDF;

an output combiner, optically coupled with said EYDF; and

a third fiber pump diode, optically coupled with said output combiner, for pumping said EYDF,

wherein said WDM and said at least one signal diode are located on opposite sides of said EDF,

wherein each said respective output combiner outputs a respective one of said plurality of amplified beams of light.

68. Method, for detecting at least one object, comprising the procedures of:

scanning a volume of interest, from a moving vehicle, using a pulsed beam of light at a certain field-of-view (FOV);

detecting the motion of said vehicle;

adjusting said FOV according to detected motion of said vehicle.

69. The method according to claim 68, wherein said procedure of adjusting comprises adjusting said FOV according to a detected linear velocity of said vehicle using an increasing function.

70. The method according to claim 68, wherein said procedure of adjusting comprises adjusting said FOV according to a detected angular velocity of said vehicle using a decreasing function.

71. The method according to claim 68, wherein said detected motion is selected from the list consisting of:

the angular velocity of said vehicle;

the angular acceleration of said vehicle;

the linear velocity of said vehicle; and

the linear acceleration of said vehicle.

72. The method according to claim 68, wherein said pulsed beam of light is at a certain line-of-sight (LOS), further comprising the procedure of adjusting said LOS in the direction of said motion according to a detected angular velocity of said vehicle using an increasing function.

73. The method according to claim 68, wherein said pulsed beam of light is at a certain pulse repetition rate (PRR), and wherein said pulsed beam of light originates from a light source, further comprising the procedure of adjusting said PRR of said pulsed beam of light according to said detected motion.

74. The method according to claim 73, wherein said procedure of adjusting comprises adjusting said PRR according to a detected linear velocity of said vehicle using an increasing function.

75. The method according to claim 73, wherein said procedure of adjusting comprises adjusting said PRR according to a detected angular velocity of said vehicle using a decreasing function.

76. The method according to claim 73, further comprising the procedures of:

detecting the motion of said light source with respect to said vehicle;

adjusting the PRR of said pulsed beam of light according to said detected motion.

77. The method according to claim 76, wherein said procedure of adjusting comprises adjusting said PRR according to a detected linear velocity of said light source with respect to said vehicle using an increasing function.

78. The method according to claim 76, wherein said procedure of adjusting comprises adjusting said PRR according to a detected angular velocity of said light source with respect to said vehicle using a decreasing function.

79. The method according to claim 68, wherein said pulsed beam of light is at a certain output peak power and wherein said pulsed beam of light originates from a light source, further comprising the procedure of adjusting said output peak power of said pulsed beam of light according to said detected motion.

80. The method according to claim 79, wherein said procedure of adjusting comprises adjusting said output peak power according to a detected linear velocity of said vehicle using an increasing function.

81. The method according to claim 79, further comprising the procedures of:

detecting the motion of said light source with respect to said vehicle;

adjusting said output peak power of said pulsed beam of light according to a detected motion of said light source.

82. The method according to claim 81, wherein said procedure of adjusting comprises adjusting said output peak power according to a detected linear velocity of said light source with respect to said vehicle using an increasing function.