Laser ignition system

• US 20120312267A1
• Filed: 10/19/2010
• Published: 12/13/2012
• Est. Priority Date: 12/14/2009
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Ridderbusch, Heiko
• Application Number:
  US13/515,771
• Publication Number:
  US 20120312267A1
• Time in Patent Office: Days
• US Class Current: 123/143.B
• CPC Class Codes: F02P 23/04 Other physical ignition means, e.g. using laser rays
• CPC Class Codes: H01S 3/0621 Coatings on the end-faces, e.g. input/output surfaces of the laser light
• CPC Class Codes: H01S 3/0627 the resonator being monolithic, e.g. microlaser
• CPC Class Codes: H01S 3/07 consisting of a plurality of parts, e.g. segments H01S3/067 takes precedence
• CPC Class Codes: H01S 3/082 defining a plurality of resonators, e.g. for mode selection or suppression
• CPC Class Codes: H01S 3/094076 Pulsed or modulated pumping H01S3/1024 takes precedence
• CPC Class Codes: H01S 3/09415 the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
• CPC Class Codes: H01S 3/113 using intracavity saturable absorbers
• CPC Class Codes: H01S 3/1611 neodymium
• CPC Class Codes: H01S 3/1643 YAG
• CPC Class Codes: H01S 3/2333 Double-pass amplifiers

Abstract

A laser device for a laser ignition system for an internal combustion engine, in particular of a motor vehicle or a stationary engine, including a laser oscillator, the laser oscillator having a first laser-active solid, an optical Q-switch, and an output mirror which is partially reflective for a light to be generated by the laser device, in which the laser oscillator has another mirror which is partially reflective for the light to be generated by the laser device.

Claims

1-16. -16. (canceled)

17. A laser device for a laser ignition system for an internal combustion engine of a motor vehicle or a stationary engine, comprising:

a laser oscillator having a first laser-active solid, an optical Q-switch, and an output mirror which is partially reflective for a light to be generated by the laser device, wherein the laser oscillator has another mirror which is partially reflective for the light to be generated by the laser device.

18. The laser device of claim 17, wherein the partially reflective output mirror and the partially reflective mirror are situated on opposite sides of the first laser-active solid or the laser oscillator.

19. The laser device of claim 17, further comprising:

a laser amplifier having at least one second laser-active solid.

20. The laser device of claim 19, wherein the laser amplifier has a mirror, which is highly reflective for the light to be generated by the laser device, on a side facing away from the laser oscillator.

21. The laser device of claim 20, wherein the highly reflective mirror forms, together with at least one mirror which is partially reflective for the light to be generated by the laser device, an optical resonator in which the second laser-active solid is located.

22. The laser device of claim 20, wherein the highly reflective mirror forms, together with a mirror of the laser oscillator, an optical resonator in which the second laser-active solid is located.

23. The laser device of claim 17, wherein the partially reflective output mirror is a coating of the first laser-active solid or of the optical Q-switch and/or the other partially reflective mirror is a coating of the first laser-active solid.

24. The laser device of claim 20, wherein the other partially reflective mirror is a coating of the first or the second laser-active solid and/or the highly reflective mirror is a coating of the second laser-active solid.

25. The laser device of claim 19, wherein the first and the second laser-active solids represent a monolithic unit, implemented by optical contacting, sintering and/or bonding.

26. The laser device of claim 25, wherein an SiO₂-containing intermediate layer is situated between the first and the second laser-active solids, the SiO₂-containing intermediate layer being furthermore connected to at least one of the coatings applied to the first or the second laser-active solid.

27. A laser ignition system for an internal combustion engine of a motor vehicle or a stationary engine, comprising:

a laser device, including a laser oscillator having a first laser-active solid, an optical Q-switch, and an output mirror which is partially reflective for a light to be generated by the laser device, wherein the laser oscillator has another mirror which is partially reflective for the light to be generated by the laser device; and

at least one pumped light source which provides a pumped light which is supplied to the laser device.

28. The laser ignition system of claim 27, wherein:

the laser device further including a laser amplifier having at least one second laser-active solid, wherein the laser amplifier has a mirror, which is highly reflective for the light to be generated by the laser device, on a side facing away from the laser oscillator, and

the pumped light is supplied to the laser device through the mirror which is highly reflective for the light to be generated by the laser device and which subsequently passes initially through the second laser-active solid and later through the first laser-active solid.

29. The laser ignition system of claim 28, further comprising:

a guiding light arrangement for guiding light through which the pumped light is transferred from the pumped light source to the laser device and focused within the laser device, within the laser oscillator.

30. A method for operating a laser ignition system having a laser device, the method comprising:

as a consequence of supplying pumped light to the laser device, bleaching out the optical Q-switch, so that, as a result of the bleaching out, a laser oscillator emits at least two laser pulses in different directions;

wherein the laser ignition system includes;

the laser device, including the laser oscillator having a first laser-active solid, an optical Q-switch, and an output mirror which is partially reflective for a light to be generated by the laser device, wherein the laser oscillator has another mirror which is partially reflective for the light to be generated by the laser device; and

at least one pumped light source which provides a pumped light which is supplied to the laser device.

31. The method of claim 30, wherein one of the at least two emitted laser pulses, which is emitted in a first direction, is focused onto a first point, and another of the at least two emitted laser pulses, which is emitted in another direction, is focused onto another point, the first point and the second point essentially matching and/or the second laser pulse propagating essentially coaxially to the first laser pulse following a deflection.

32. The method of claim 30, wherein a consequence of supplying pumped light to the laser device is a bleaching out of the optical Q-switch, without resulting directly beforehand in a population inversion corresponding to a laser threshold within the second laser-active solid.