Scattered light focusing method based on spatial light modulation and neural network

Abstract

The invention relates to a scattered light focusing method based on spatial light modulation and a neural network, and belongs to the technical field of computational optical imaging. Firstly, a strategy neural network is initialized and random scattered light collection is carried out, then a to-be-focused position is selected, an evaluation neural network is initialized and trained, the trained evaluation neural network is utilized to train the strategy neural network, and the trained strategy neural network is utilized to output the focusing phase modulation amount of the spatial light modulator, and the focusing of the scattered light at the to-be-focused position is realized. Due to the fact that collection of random scattered light is irrelevant to the specific focusing position, any area of the imaging face of the image sensor can be selected as the focusing position in the training stage of the strategy neural network and the evaluation neural network. When different focusing positions are changed, only initialization definition and training of the evaluation neural network and training of the strategy neural network need to be carried out again, the phase modulation amount needed by focusing can be obtained, and random scattered light collection which is repeated many times does not need to be carried out again.

Description

technical field [0001] The invention belongs to the technical field of computational optical imaging, in particular to a scattered light focusing method based on spatial light modulation and neural network. Background technique [0002] The spatial light modulator has multiple controllable units, and each unit can independently change the phase or amplitude of the light incident on the unit. Wherein, the phase or amplitude of the incident light can be spatially modulated by the spatial light modulator to realize focusing of the light beam. However, when the light is randomly scattered, it is difficult to directly measure the changes in the amplitude and phase of the incident light due to the scattering process. Therefore, it is impossible to directly determine the phase or amplitude modulation of each unit required to focus the scattered beam. The current solution is mainly based on the wavefront correction method, which needs to pre-specify the desired focus position, and ...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this method is that after hundreds to thousands of feedback iterations, the beam can only be focused near the desired focal point

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