Methods and systems for control of nonlinear light transmission

Patent metadata

Field	Value
Publication number	US-11768420-B2
Application number	US-201916723196-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Jul 18, 2017
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

Recent remarkable progress in wave-front shaping has enabled control of light propagation inside linear media to focus and image through scattering objects. In particular, light propagation in multimode fibers comprises complex intermodal interactions and rich spatiotemporal dynamics. Control of physical phenomena in multimode fibers and its applications is in its infancy, opening opportunities to take advantage of complex mode interactions. Various embodiments of the present technology provide wave-front shaping for controlling nonlinear phenomena in multimode fibers. Using a spatial light modulator at the fiber's input and a genetic algorithm optimization, some embodiments control a highly nonlinear stimulated Raman scattering cascade and its interplay with four wave mixing via a flexible implicit control on the superposition of modes that are coupled into the fiber.

First claim

What is claimed is:

1. A method for shaping multimode dynamics in a transmission medium, the method comprising:
measuring a property of a light output at a distal end of a transmission medium;
selecting, using a controller, a phase mask to shape the property of the light as measured at the distal end of the transmission medium, wherein selecting the phase mask comprises:
controlling, using the controller, generation of nonlinear stimulated Raman scattering (SRS) cascades and four-wave-mixing of the light in the transmission medium; and

instructing a spatial light modulator to apply the phase mask to an input light generated by a light source to selectively tune nonlinear interactions within the transmission medium.

2. The method of claim 1 , wherein the transmission medium includes a waveguide, a multimode fiber, a multicore fiber, a waveguide array, a step index fiber, a nonlinear material, or a graded indexed (GRIN) fiber.

3. The method of claim 1 , further comprising generating the light using a femtosecond pulsed laser, a picosecond pulsed laser, or a nanosecond pulsed laser.

4. The method of claim 1 , wherein the light source includes a laser light system, and wherein the nonlinear interactions occur within the laser light system.

5. The method of claim 1 , wherein the controller further controls at least one of the following properties: a polarization of the light, a pulse shape or duration of the light, a spectrum of the light, a spatial shape distribution of the light, a reduction of nonlinear effects, and an output of a laser.

6. The method of claim 1 , wherein the light is used to transmit information.

7. The method of claim 1 , wherein the light is used to retrieve imaging information from either the distal end, or a proximal end, of the transmission medium.

8. The method of claim 1 , wherein the method is implemented as part of a laser system.

9. The method of claim 1 , wherein the method implements an artificial neural network.

10. A system for shaping multimode dynamics in a transmission medium, the system comprising:
a means for measuring a property of a light output at a distal end of a transmission medium;
a means for controlling one or more properties of an input light directed to a proximal end of the transmission medium to control the property of the light as measured at the distal end, wherein the means for controlling one or more properties of the input light is configured to control generation of nonlinear stimulated Raman scattering (SRS) cascades and four-wave-mixing of the light in the transmission medium; and
a means for controlling the input light generated by a light source to selectively tune nonlinear interactions within the transmission medium.

11. The system of claim 10 , wherein the one or more properties of the input light include at least one of: a spatial phase, an amplitude, a polarization, a pulse shape, a pulse duration, and a spectral shape.

12. The system of claim 10 , wherein the means for controlling one or more properties of the input light is a spatial light modulator comprising a liquid crystal spatial light modulator, a phase mask, or a deformable mirror device.

13. The system of claim 10 , wherein the transmission medium includes a waveguide, a multimode fiber, a multicore fiber, a waveguide array, a step index fiber, a bulk medium, a nonlinear optical material, or a graded indexed (GRIN) fiber.

14. The system of claim 10 , further comprising a means for generating the input light using a laser system.

15. The system of claim 14 , wherein the means for generating the input light is configured to generate the input light using one of: a femtosecond pulsed laser, a picosecond pulsed laser, and a nanosecond pulsed laser.

16. The system of claim 10 , wherein the means for controlling one or more properties of the input light is further configured to control at least one of the following properties: a polarization of the light as measured at the distal end of the transmission medium, a pulse shape or duration of the light as measured at the distal end, a spectrum of the light as measured at the distal end, a spatial shape distribution of the light as measured at the distal end, and a reduction of nonlinear effects.

17. The system of claim 10 , wherein the light is used to transmit information.

18. The system of claim 10 , wherein the light is used to retrieve imaging information from either the distal end, or the proximal end, of the transmission medium.

19. One or more non-transitory computer-readable storage media having programmable instructions stored thereon which, when executed by a system for shaping multimode dynamics in a transmission medium, cause the system to:
measure a property of a light output at a distal end of a transmission medium;
select, using a controller, a light modulator setting to shape the property of the light as measured at the distal end of the transmission medium, wherein when executed by the system to select the light modulator setting, the program instructions further cause the system to control, using the controller, generation of nonlinear stimulated Raman scattering (SRS) cascades and four-wave-mixing of the light in the transmission medium; and
instruct a light modulator to shape an input light generated by a light source to selectively tune nonlinear interactions within the transmission medium.

20. The one or more non-transitory computer-readable media of claim 19 , wherein the property of the input light controlled at a proximal end of the transmission medium includes at least one of: a spatial phase, an amplitude, a polarization, a pulse shape, a pulse duration, and a spectral shape.

21. The one or more non-transitory computer-readable media of claim 19 , wherein the system includes a light modulator comprising a liquid crystal spatial light modulator, a phase mask, or a deformable mirror device.

22. The one or more non-transitory computer-readable storage media of claim 19 , wherein the transmission medium includes a waveguide, a multimode fiber, a multicore fiber, a waveguide array, a step index fiber, a bulk medium, a nonlinear optical material, or a graded indexed (GRIN) fiber.

23. The one or more non-transitory computer-readable storage media of claim 19 , wherein when executed by the system, the program instructions further cause the system to generate the input light using a femtosecond pulsed laser, a picosecond pulsed laser, or a nanosecond pulsed laser.

24. The one or more non-transitory computer-readable storage media of claim 19 , wherein when executed by the system, the program instructions further cause the system to cause the controller to control at least one of the following properties: a polarization of the light as measured at the distal end of the transmission medium, a pulse shape or duration of the light as measured at the distal end, a spectrum of the light as measured at the distal end, a spatial shape distribution of the light as measured at the distal end, and a reduction of nonlinear effects.

25. The one or more non-transitory computer-readable storage media of claim 19 , wherein the light is used to transmit at least one of: information, and imaging information.

26. The method of claim 1 further comprising shaping the multimode dynamics in the transmission medium according to the property of the light as measured at the distal end of the transmission medium.

Assignees

• Univ Colorado Regents

Inventors

• Tzang Omer
• Piestun Rafael
• Caravaca-Aguirre Antonio Miguel
• Wagner Kelvin

Classifications

• G02F1/365 Primary

  in an optical waveguide structure (G02F1/377, {G02F1/395} take precedence) · CPC title

• G01N21/65

  Raman scattering · CPC title

• G01N29/46

  by spectral analysis, e.g. Fourier analysis {or wavelet analysis (spectral signal processing per se G06F17/14)} · CPC title

• G02F1/3501

  Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals · CPC title

• G02F1/3536

  Four-wave interaction · CPC title