Apparatus and method for single-channel digital optical phase conjugation

Patent metadata

Field	Value
Publication number	US-10036888-B2
Application number	US-201414579636-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Sep 19, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A single-channel phase conjugation apparatus includes a spatial light modulator and a single-channel optical sensing and generating unit. The spatial light modulator receives a light having a wavefront scattered by a scattering object. The single-channel optical sensing and generating unit senses a phase control wavefront of an output light focused by the spatial light modulator and outputs a light having a phase conjugation wavefront by changing a direction of the output light in a reverse direction depending on the phase control wavefront.

First claim

What is claimed is:

1. A single-channel phase conjugation apparatus, comprising:
a single-channel optical sensing and generating unit; and
a spatial light modulator configured to receive a light having a wavefront scattered by a scattering object and focus the light by outputting the light to the single-channel optical sensing and generating unit,
wherein the single-channel optical sensing and generating unit is configured to sense a phase control wavefront of the output light focused by the spatial light modulator and to output light having a phase conjugation wavefront by changing a direction of the output light in a reverse direction depending on the phase control wavefront.

2. The single-channel phase conjugation apparatus of claim 1 , wherein the single-channel optical sensing and generating unit senses the phase control wavefront using a predetermined iterative algorithm for focusing an intensity of the light through a plurality of measuring operations to search for an optimal phase control wavefront.

3. The single-channel phase conjugation apparatus of claim 1 , wherein the spatial light modulator focuses an intensity of the light having the scattered wavefront on the single-channel optical sensing and generating unit.

4. The single-channel phase conjugation apparatus of claim 1 , wherein a difference between a wavelength of the light having the phase conjugation wavefront and a wavelength of the output light from the spatial light modulator is smaller than or equal to a reference wavelength.

5. The single-channel phase conjugation apparatus of claim 1 , wherein the single-channel optical sensing and generating unit outputs the light having the phase conjugation wavefront as reversely changing a phase of the output light depending on the phase control wavefront.

6. The single-channel phase conjugation apparatus of claim 1 , wherein the single-channel optical sensing and generating unit restores the output light from the spatial light modulator to a light before scattering of the scattering object as reversely changing a direction of the output light depending on the phase control wavefront.

7. The single-channel phase conjugation apparatus of claim 1 , wherein the single-channel optical sensing and generating unit is a pinhole or a single-channel optical fiber.

8. The single-channel phase conjugation apparatus of claim 1 , further comprising:
at least one of a polarization plate, a dichroic filter, a mirror, and a lens, the at least one being disposed between the spatial light modulator and the single-channel optical sensing and generating unit.

9. A single-channel phase conjugation method, comprising:
receiving, by a spatial light modulator, a light having a wavefront scattered by a scattering object;
focusing, by the spatial light modulator, the light by outputting the light to a single-channel optical sensing and generating unit;
sensing, by the single-channel optical sensing and generating unit, a phase control wavefront of the focused light; and
outputting, by the single-channel optical sensing and generating unit, light having a phase conjugation wavefront by changing a direction of the focused light in a reverse direction depending on the phase control wavefront.

10. The single-channel phase conjugation method of claim 9 , wherein the sensing of a phase control wavefront includes:
sensing the phase control wavefront using a predetermined iterative algorithm for focusing an intensity of the light through a plurality of measuring operations to search for an optimal phase control wavefront.

11. The single-channel phase conjugation method of claim 9 , further comprising:
focusing an intensity of the light having the scattered wavefront on a single-channel optical sensing and generating unit.

12. The single-channel phase conjugation method of claim 9 , wherein a difference between a wavelength of the light having the phase conjugation wavefront and a wavelength of the focused light from the spatial light modulator is smaller than or equal to a reference wavelength.

13. The single-channel phase conjugation method of claim 9 , wherein the outputting of a light includes:
outputting the light having the phase conjugation wavefront by reversely changing a phase of a light depending on the phase control wavefront.

14. The single-channel phase conjugation method of claim 9 , wherein the outputting of a light includes:
restoring a light from the spatial light modulator to a light before scattering of the scattering object by reversely changing a direction of a light depending on the phase control wavefront.

15. A single-channel phase conjugation apparatus, comprising:
a light source configured to emit light to a scattering object;
a single-channel optical sensing and generating unit; and
a spatial light modulator configured to receive the light having a wavefront scattered by the scattering object and focus the light by outputting the light to the single-channel optical sensing and generating unit,
wherein the single-channel optical sensing and generating unit is configured to sense a phase control wavefront of the focused light to restore the light emitted from the light source to light before scattering due to the scattering object by changing a direction of the focused light in a reverse direction depending on the phase control wavefront.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Park Yongkeun
• Lee Kyeo Reh

Classifications

• G02B27/0012 Primary

  Optical design, e.g. procedures, algorithms, optimisation routines · CPC title

• H04B10/516

  Details of coding or modulation · CPC title

• G02F2203/50

  Phase-only modulation · CPC title

• G02B26/06 Primary

  for controlling the phase of light (G02B26/08 takes precedence {, measuring optical phase difference G01J9/00}) · CPC title

• H01S3/13

  Stabilisation of laser output parameters, e.g. frequency or amplitude · CPC title