Coherent Optical Receiver Wavefront Shaping Scattering Correction
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Solution Overview
Problem
Highly-scattering media pose challenges for optical imaging systems by introducing aberrations and scattering effects that are difficult to correct, leading to issues with light wave interactions and the formation of speckle patterns that hinder accurate imaging.
Innovation Solution
An imaging system comprising a spatial light modulator and a coherent optical receiver that performs wavefront shaping based on error signals derived from speckle patterns, using a local oscillator wave for mixing and coherent detection to iteratively adjust the optical input wave and focus it onto a selected location, thereby mitigating scattering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wavefront shaping is performed iteratively to correct scattering effects, then imaging quality is improved, but system complexity increases
Solution Approach 1:
The patent implements iterative wavefront shaping by using the coherent optical receiver to detect the output wave from the scattering medium and feed this information back to the spatial light modulator. The receiver provides feedback signals that enable the modulator to adjust the wavefront shape in successive iterations, progressively correcting scattering effects and improving imaging quality through closed-loop control.
Solution Approach 2:
The patent replaces traditional mechanical or iterative adjustment methods with coherent optical detection and digital signal processing. Instead of mechanical adjustments to correct wavefront distortion, the system uses coherent detection to measure the scattered light field and digitally computes the required wavefront correction, substituting mechanical complexity with optical and computational methods.
2Measurement precision
If coherent optical detection is used to extract amplitude and phase information, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces a local oscillator wave as an intermediary to enable coherent detection. The local oscillator serves as a reference wave that mixes with the scattered light wave in a beam splitter, converting the optical field into an electrical signal that contains amplitude and phase information. This intermediary mechanism enables precise measurement without requiring direct complex optical measurements.
Solution Approach 2:
The patent substitutes direct optical measurement with electrical signal processing by using coherent detection. Instead of measuring optical properties directly, the system mixes the optical field with a local oscillator and detects the resulting electrical signal, transferring the measurement problem from the optical domain to the electrical domain where more precise and controllable measurements can be performed.
3Manufacturing precision
If iterative wavefront shaping is implemented to focus light at a selected location, then focusing precision is improved, but time consumption increases
Solution Approach 1:
The patent implements continuous iterative optimization where the spatial light modulator continuously adjusts the wavefront shape based on feedback from the coherent optical receiver. Rather than discrete adjustments, the system performs continuous iterative shaping to maximize light intensity at the selected location, maintaining useful action throughout the optimization process to achieve high focusing precision.
Solution Approach 2:
The coherent optical receiver provides real-time feedback signals that enable the spatial light modulator to adjust the wavefront in successive iterations. This feedback mechanism allows the system to progressively improve focusing precision by using information about the actual light distribution to guide subsequent adjustments, accelerating the convergence toward the optimal focus position.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively corrects for scattering effects by optimizing wavefront shaping, resulting in improved focusing and increased intensity of the light wave at a specific location, enhancing imaging quality through the use of iterative wavefront adjustments and coherent detection.
Implementation Method 1
The spatial light modulator may be configured to receive an optical input wave and perform wavefront shaping on the optical input wave to output a shaped wave
Implementation Method 2
The optical beam splitter may be configured to receive a scattering medium output wave and the local oscillator wave and mix the scattering medium output wave with the local oscillator wave to form a mixed wave
Implementation Method 3
The processing circuitry may be configured to receive the electrical signal from the optical detector, perform coherent detection on the electrical signal to extract optical amplitude and phase information corresponding to the mixed wave
Implementation Method 4
Light waves are refracted or reflected as they pass through or are reflected from a scattering medium. When light is highly scattered by such a medium, speckle patterns of light can be formed at a receiving device
Data Source
AI summary
An example imaging system may include a spatial light modulator and a coherent optical receiver. The spatial light modulator may be configured to receive an optical input wave and perform wavefront shaping on the optical input wave to output a shaped wave. The coherent optical receiver may include an optical local oscillator, an optical beam splitter, an optical detector, and processing circuitry. The optical detector may be configured to receive a mixed wave from the optical beam splitter that is based on the mixing of a local oscillator wave with a scattering medium output wave that at least initially comprises a speckle pattern formed by the shaped wave interacting with a scattering medium. The processing circuitry may be configured to perform coherent detection on the mixed wave to extract optical amplitude and phase information, and provide an error signal as feedback to the spatial light modulator for performing iterative wavefront shaping.