Adaptive optical system based on modulation and modulation-free combined pyramid wave-front sensor

Abstract

The invention discloses an adaptive optical system based on a modulation and modulation-free combined pyramid wave-front sensor. The adaptive optical system comprises a wave-front correction module, a beam-splitting module, an imaging module, a pyramid wave-front sensor module and a control module, wherein before the adaptive optical system works, the pyramid wave-front sensor in a modulation operating mode is utilized to measure the transfer function of the system, and when the adaptive optical system works, the pyramid wave-front sensor in a modulation-free operating mode is utilized to perform closed-loop control. According to the adaptive optical system, the signal to noise ratio can be improved when the transfer function of the system is measured, and a stable transfer function matrix is obtained; and meanwhile, the detection sensitivity can be effectively improved in the closed-loop control process.

Description

technical field [0001] The invention relates to an adaptive optics system based on a modulated and non-modulated combined pyramidal wavefront sensor. Background technique [0002] Adaptive optics technology uses optoelectronic devices to measure wavefront dynamic errors in real time, uses fast electronic systems for calculation and control, and uses active devices for real-time wavefront correction, so that the optical system has the ability to automatically adapt to changes in external conditions and maintain a good working condition . Generally, an adaptive optics system includes three basic components: a wavefront sensor that detects wavefront errors, a wavefront controller that provides a wavefront correction signal, and a wavefront corrector that dynamically corrects distortion. Among them, the wavefront sensor measures the wavefront error from the target or the beacon near the target in real time. It is the core unit device in the adaptive optics system, and typically...

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Problems solved by technology

The adaptive optics system of pyramidal wavefront sensor with modulation working mode is adopted abroad. In the process of transfer function measurement and closed-loop control, the pyramidal wavefront sensor works in the working mode of modulation. In the process of closed-loop control, although the working mode of modulation The detection linear range is increased, but the detection sensitivity of the pyramidal wavefront sensor is reduced. At the same time, because the closed-loop control requires a high detection frame frequency, it requires a higher frequency for modulating the tilting mirror, which increases the hardware complexity of the system; The adaptive optics system of the pyramidal wavefront sensor in the non-modulation working mode is adopted abroad. During the transfer function measurement process and the closed-loop control process, the pyramidal wavefront sensor works in the non-modulation working mode, but because the pyramidal wavefront sensor The detection linear range is very small, so the degree of influence by various noises and static aberrations will be exacerbated during the transfer function measurement process, and may even cause errors in the transfer function measurement

[0003] At present, there is no report on the adaptive optics system that uses a pyramidal wavefront sensor with a modulation working mode to measure the transfer function, and uses a pyramidal wavefront sensor with a non-modulating working mode for closed-loop control.

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