Space-time induced linearly encoded transcription for temporal optimization (STILETTO)

Patent metadata

Field	Value
Publication number	US-11715924-B2
Application number	US-202016796564-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 20, 2020
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

Space-to-time pulse shaping techniques are provided that maintain high fidelity with a practical output coupler, maintain an output resolution that is no longer than the input pulse, and are scalable to long records while maintaining fine resolution.

First claim

We claim:

1. A method, comprising:
directing a laser pulse to an optical system configured to produce a tilted pulse front from said laser pulse;
directing said tilted pulse front through an imaging system configured to image said optical system onto a spatial patterning system, wherein said patterning system produces a temporally patterned pulse from said tilted pulse front; and
coupling said temporally patterned pulse into a single-spatial-mode-system to produce an output pulse.

2. The method of claim 1 , wherein said optical system is selected from the group consisting of at least one diffractive optic, at least one prism and at least one etalon.

3. The method of claim 1 , wherein said laser pulse comprises a pulse duration of less than 1 ps.

4. The method of claim 1 , wherein said imaging system comprises a telescope, wherein said telescope comprises a magnification selected from the group consisting of 1:1 and 1:<1.

5. The method of claim 1 , wherein the step of producing a temporally patterned pulse from said tilted pulse front utilizes a patterning system selected from the group consisting of a mask and a spatial light modulator (SLM).

6. The method of claim 1 , wherein said single-spatial-mode system is selected from the group consisting of an optical cavity, a waveguide, fiber optic system, and a series of apertures.

7. The method of claim 1 , comprising at least one of (i) wherein said output pulse is spatially confined to a single spatial mode with no pulse front tilt or space time coupling and (ii) wherein said output pulse retains the temporal profile of said patterned pulse.

8. The method of claim 1 , wherein said laser pulse is directed onto said optic at an angle such that, to reach said imaging system, some rays of said laser pulse travel a relatively shorter distance from said optic than other rays of said laser pulse, which results in said tilted pulse front.

9. The method of claim 1 , wherein said patterned pulse is coupled into said single-spatial-mode-system in one of (i) the near field of said patterned pulse or (ii) the far field of said patterned pulse.

10. The method of claim 1 , further comprising tuning the central wavelength of the coupled laser pulse spectrum of said patterned pulse by adjusting the coupling between said patterned pulse and said single-spatial-mode-system.

11. The method of claim 1 , further comprising applying a chirp to said tilted pulse front.

12. The method of claim 1 , wherein said output pulse comprise a record length selected from the group consisting of (i) at least 100 ps and a resolution of at least 1 ps and (ii) within a range of 100 ps to 1 ns and a resolution of at least 1 ps.

13. The method of claim 1 , wherein said output pulse is patterned with at least one temporal feature that is not longer than said laser pulse.

14. The method of claim 1 , further comprising comparing said temporally patterned pulse to a desired temporal profile and iteratively modifying said patterning system so that subsequent temporally patterned pulses converge toward said desired temporal profile.

15. An apparatus, comprising:
an optical system configured to produce a tilted pulse front from a laser pulse;
an imaging system configured to image said optical system onto a spatial patterning system, wherein when said tilted pulse front is directed through said imaging system, said patterning system produces a temporally patterned pulse from said tilted pulse front; and
a single-spatial-mode-system positioned to receive said temporally patterned pulse to produce an output pulse.

16. The apparatus of claim 15 , wherein said optical system is selected from the group consisting of at least one diffractive optic, at least one prism and at least one etalon.

17. The apparatus of claim 15 , wherein said laser pulse comprises a pulse duration of less than 1 ps.

18. The apparatus of claim 15 , wherein said imaging system comprises a telescope, wherein said telescope comprises a magnification selected from the group consisting of 1:1 and 1:<1.

19. The apparatus of claim 15 , wherein said patterning system is selected from the group consisting of a mask and a spatial light modulator (SLM).

20. The apparatus of claim 15 , wherein said single-spatial-mode system is selected from the group consisting of an optical cavity, a waveguide and a series of apertures.

21. The apparatus of claim 15 , comprising at least one of (i) wherein said output pulse is spatially confined to a single spatial mode with no pulse front tilt or space time coupling and (ii) wherein said output pulse retains the temporal profile of said patterned pulse.

22. The apparatus of claim 15 , further comprising means for coupling said patterned pulse into said single-spatial-mode-system in one of (i) a near field of said patterned pulse or (ii) a far field of said patterned pulse.

23. The apparatus of claim 15 , wherein said output pulse comprise a record length selected from the group consisting of (i) at least 100 ps and a resolution of at least 1 ps and (ii) within a range of 100 ps to 1 ns and a resolution of at least 1 ps.

24. The apparatus of claim 15 , wherein said output pulse comprises a resolution feature size that is no longer than a length of said laser pulse.

25. The apparatus of claim 15 , further comprising means for iteratively modifying said patterning system so that subsequent temporally patterned pulses converge toward a desired temporal profile.

26. The apparatus of claim 15 , wherein at least one of said optical system, said imaging system, said spatial patterning system and said single-spatial-mode-system are an integrated photonic circuit element.

27. An apparatus, comprising:
a pulse tilting/patterning system including:
an imaging system having an optical axis;
a pulse tilting optical system located on said optical axis; and
a pulse spatial patterning system, the pulse spatial patterning system including a programmable mask disposed at an angle to said optical axis and wherein an output pulse is produced when a laser pulse is directed on said optical axis through said pulse tilting/patterning system.

28. The apparatus of claim 27 , wherein when said laser pulse is directed to said pulse tilting optical system in the direction from said pulse tilting optical system to said imaging system, said pulse tilting optical system is configured to produce a tilted pulse front from said input pulse, wherein said imaging system is configured to image said pulse tilting optical system onto said pulse spatial patterning system, and wherein said pulse spatial patterning system is configured to produce a temporally patterned pulse from said tilted pulse front.

29. The apparatus of claim 27 , wherein when said laser pulse is directed to said pulse spatial patterning system in the direction from said pulse spatial patterning system to said imaging system, said pulse spatial patterning system is configured to produce a temporally patterned pulse from said input pulse, wherein said imaging system is configured to image said pulse spatial patterning system onto said pulse tilting optical system, and wherein said pulse tilting optical system is configured to produce a tilted pulse front from said temporally patterned pulse.

30. The apparatus of claim 27 , wherein the pulse tilting optical system has an image plane disposed at an

Assignees

• L Livermore Nat Security Llc

Inventors

• Muir Ryan D
• Heebner John E
• Mittelberger Daniel E

Classifications

• H01S3/0057 Primary

  Temporal shaping, e.g. pulse compression, frequency chirping (soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108) · CPC title

• H01S3/0085

  Modulating the output, i.e. the laser beam is modulated outside the laser cavity · CPC title

• H01S3/005

  Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping (shaping laser beam for working metal or other materials B23K26/06; optical elements, systems or apparatus in general G02B) · CPC title