Extreme chirped/stretched pulsed amplification and laser

• US 7,095,772 B1
• Filed: 04/21/2004
• Issued: 08/22/2006
• Est. Priority Date: 05/22/2003
• Status: Expired due to Fees

• Current Assignee: University of Central Florida (State University System of Florida)
• Original Assignee: University of Central Florida (State University System of Florida)
• Inventors: Resan, Bojan, Delfyett, Peter J., Kim, Kyungbum
• Primary Examiner(s): Rodriguez, Armando
• Assistant Examiner(s): SAYADIAN, HRAYR
• Application Number:
  US10/828,965
• Time in Patent Office: 853 Days
• Field of Search: 372/21, 372/39, 372/43.01, 372/50.22, 372/69, 372/70, 372/75, 359/333, 359/334
• US Class Current: 372/50.22
• CPC Class Codes: H01S 2301/02 ASE (amplified spontaneous emission), noise; Reduction thereof
• CPC Class Codes: H01S 3/0057 Temporal shaping, e.g. pulse compression, frequency chirping soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108
• CPC Class Codes: H01S 5/065 Mode locking; Mode suppression; Mode selection ; Self pulsating
• CPC Class Codes: H01S 5/0657 Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity
• CPC Class Codes: H01S 5/141 using a wavelength selective device, e.g. a grating or etalon H01S5/146 takes precedence
• CPC Class Codes: H01S 5/50 Amplifier structures not provided for in groups H01S5/02 - H01S5/30
• CPC Class Codes: H01S 5/5027 Concatenated amplifiers, i.e. amplifiers in series or cascaded

Abstract

Methods, devices and systems for generating ultrashort optical linear chirped pulses with very high power by amplifying the pulses so that their temporal duration is longer than the storage time of the amplifying medium. The additional gain factor is related to the ratio of the storage time to the stretched pulse. A preferred embodiment connects a mode locked laser source that generates optical pulses whose duration is stretched with a chirped fiber Bragg grating. Embodiments include methods, devices and systems causing an extreme chirped pulse amplifier (XCPA) effect in an oscillator.

Claims

1. A method of generating ultrashort optical pulses having increased optical power, comprising the steps of:

generating optical pulses from a source;

stretching duration of each of the optical pulses to be greater than energy storage time of an optical amplifier;

amplifying the stretched optical pulse with the optical amplifier; and

compressing the optical pulse, wherein optical power of the compressed optical pulse is increased.

2. The method of claim 1, wherein the increased optical power is increased at least approximately 100 times.

3. The method of claim 1, wherein the optical pulses include:

chirped pulses.

4. The method of claim 3, wherein the chirped pulses include:

linear chirped pulses.

5. The method of claim 1, wherein the method step includes the step of:

providing a mode locked laser source.

6. The method of claim 5, wherein the mode locked laser source includes:

a gain-flattened mode-locked laser source.

7. The method of claim 1, wherein the optical amplifier includes:

a semiconductor optical amplifier.

8. The method of claim 7, wherein the semiconductor optical amplifier includes a grating coupled surface emitting optical amplifier.

9. A method of increasing power in optical pulses, comprising the steps of:

generating optical pulses from a source;

increasing the temporal duration of the optical pulses to be greater than the storage time of an amplifying medium connected to the optical pulses; and

amplifying the optical pulses by the amplifying medium, wherein power in the generated optical pulses in substantially increased.

10. The method of claim 9, wherein the optical pulses are chirped pulses.

11. The method of claim 10, wherein the chirped pulses are linear chirped pulses.

12. The method of claim 9, wherein the generating step includes the step of:

providing a mode locked laser source.

13. An extreme chirped pulse amplifier (XCPA), comprising:

means for generating optical pulses;

means for stretching temporal duration of the optical pulses to be greater than storage time of an amplifying medium;

means for amplifying by the amplifying medium the stretched optical pulses; and

means for compressing the stretched optical pulse, wherein higher power optical pulses are generated.

14. The laser of claim 13, wherein the generating means includes:

a mode locked laser source.

15. The laser of claim 14, wherein the generating means includes:

a gain-flattened mode-locked laser source.

16. The laser of claim 13, wherein the stretching means includes:

a chirped fiber Bragg grating.

17. The laser of claim 13, wherein the compressing means includes:

a chirped fiber Bragg grating.

18. A method of generating a highly precise high frequency timing signal, comprising the steps of:

generating optical pulses from a source;

stretching duration of each of the optical pulses to be greater than energy storage time of an optical amplifier;

amplifying the stretched optical pulse with the optical amplifier;

compressing the optical pulse; and

coupling the optical pulse to an output, wherein the optical pulse is provided as a timing signal.

19. The method of claim 18, wherein the optical pulses include:

linear chirped pulses.

20. The method of claim 18, wherein the method step includes the step of:

providing a gain-flattened mode locked laser source.

21. An extreme chirped pulse amplification (XCPA) laser oscillator, comprising:

a means for generating optical pulses;

means for stretching temporal duration of the optical pulses to be greater than storage time of an amplifying medium;

means for amplifying by amplifying medium the stretched optical pulses;

means for compressing the stretched optical pulses; and

means for coupling optical pulses to an output, wherein high frequency high precision optical pulses are provided.

22. The laser of claim 21, wherein the generating means includes:

a gain-flattened mode-locked laser source.

23. The laser of claim 21, wherein the stretching means includes:

a chirped fiber Bragg grating.

24. The laser of claim 21, wherein the compressing means includes:

a chirped fiber Bragg grating.

25. A method of generating ultrashort optical pulses having increased optical power, comprising the steps of:

generating optical pulses with high optical energy and a linear chirp;

stretching the duration of each optical pulse to be greater than the energy storage time of an optical amplifier;

amplifying the stretched optical pulse with said optical amplifier;

compressing the optical pulse, wherein the optical power of compressed optical pulse is increased.

26. The method of claim 25, wherein the method step includes modulating the optical pulse whereby the optical pulse is further shortened.

27. The method of claim 26, wherein the modulating step comprises an active modulator such as a LiNbO3 modulator.

28. The method of claim 26, wherein the modulating step comprises a passive modulator such as a multiple quantum well saturable absorber.

29. The method of claim 25, wherein the method step includes the step of:

routing the compressed optical pulse back to the generating step.

30. The method of claim 29, wherein the method step includes the step of:

output coupling the compressed optical pulse.

31. The method of claim 30, wherein the output coupling includes a:

fiber coupler.