Turbidity suppression by optical phase conjugation using a spatial light modulator
AssigneeCalifornia Institute of Technology
InventorsChanghuei Yang, Meng Cui
Life of this patent
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Abstract
A detector of light transmitted through a turbid medium, comprising: one or more Digital Optical Phase Conjugation (DOPC) devices, wherein the DOPC devices include (1) a sensor for detecting input light that has been transmitted through the turbid medium and inputted on the sensor; and (2) a spatial light modulator (SLM) for outputting, in response to the input light detected by the sensor, output light that is an optical phase conjugate of the input light.
Claims26
A detector of transmitted light that has been transmitted through a turbid medium, comprising:
- one or more Digital Optical Phase Conjugation (DOPC) devices, wherein the DOPC devices include:
- a sensor for detecting interference of reference light with input light, wherein the input light has been transmitted through the turbid medium and inputted on the sensor;
- one or more processors for:
- determining one or more input phases of the input light from the interference;
- modifying the input phases to produce optical phase conjugates of the input phases;
- and
- a spatial light modulator (SLM) for outputting, in response to the input light detected by the sensor, output light that is generated from the optical phase conjugates of the input light.
A method of fabricating a detector of transmitted light transmitted through a turbid medium, comprising:
- positioning and connecting, in one or more Digital Optical Phase Conjugation (DOPC) devices:
- a sensor for detecting interference of reference light with input light, wherein the input light has been transmitted through the turbid medium and inputted on the sensor;
- one or more processors for:
- determining one or more input phases of the input light from the interference;
- modifying the input phases to produce optical phase conjugates of the input phases;
- and
- a spatial light modulator (SLM) for outputting, in response to the input light detected by the sensor, output light that is generated from the optical phase conjugates of the input light, wherein the output light experiences reduced effects due to scattering by the turbid medium as compared to the input light.
A method for detecting transmitted light transmitted through a turbid medium, comprising:
- interfering reference light with one or more input light beams to form interference, wherein the input light beams have been transmitted through the turbid medium, inputted on the sensor, and include one or more input light fields;
- detecting the interference on a sensor;
- determining, in one or more processors, one or more input phases of the input light from the interference;
- modifying, in the one or more processors, the input phases to produce optical phase conjugates of the input phases;
- and
- outputting, from a spatial light modulator (SLM), in response to the input light beams detected by the sensor, one or more output lights beams having one or more output light fields that are the optical phase conjugates of the input light fields, wherein the sensor and the SLM are in one or more digital optical phase conjugation (DOPC) devices.
A phase conjugating device, comprising:
- a sensor for measuring interference of a reference wave with an input wave, wherein the input wave has been transmitted through a scattering medium;
- one or more processors for:
- determining one or more phases of the input wave from the interference;
- modifying the phases to produce one or more phase conjugates of the phases;
- and
- a spatial light modulator (SLM) for outputting one or more output waves generated from the phase conjugates.
Dependencies are inferred from the claim text.