High-speed adaptive optical closed-loop control method based on far field

Abstract

The invention discloses a high-speed adaptive optical closed-loop control method based on a far field, and the method employs a device which consists of a far-field collection module, a far-field-to-wavefront restoration module, a high-voltage amplifier, and a wavefront corrector module, and the far-field collection module records the change process of a far-field image in real time. The wavefrontrestoration module restores wavefront according to the far-field light intensity distribution of the current frame and the far-field light intensity distribution of the previous frame, and drives thehigh-voltage amplifier to control the wavefront corrector to correct the phase difference in the light path according to the wavefront information obtained by restoration. Single far-field light intensity distribution is adopted for closed-loop control, additional far-field information such as far-field light spot distribution on an out-of-focus surface does not need to be added, the light path structure can be simplified, and meanwhile the light energy utilization rate is increased; the phase of the incident wavefront can be determined according to the far fields of the front frame and the rear frame, and particularly, aberration data can be accurately obtained under the condition of less self-adaptive optical correction or smaller input aberration, so that the aberration can be quicklyand accurately corrected, and the real-time performance is stronger.

Description

technical field [0001] The invention relates to a wavefront closed-loop control method, in particular to a far-field-based high-speed adaptive optical closed-loop control method. Background technique [0002] Adaptive optics wavefront control method is an important part of adaptive optics technology. The current adaptive optics wavefront control mainly adopts: control method based on Hartmann wavefront sensor, wavefront control method based on phase difference (PD) far field, and wavefront control method based on quadrangular pyramid and curvature sensor. [0003] Compared with other wavefront measurement methods, the phase difference control method has a higher utilization rate of light energy, and has a relatively large advantage in fields such as astronomy and biomedicine that require a higher utilization rate of light energy. The adaptive optical wavefront control method based on single far field (adaptive optical control algorithm without wavefront sensor) has been gre...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fast closed-loop convergence algorithm for the problem of slow convergence speed in the adaptive optics control algorithm without wavefront sensors

Images