Coherent synthesis phase observe and control apparatus based on stripe characteristic extraction

Abstract

The present invention discloses a coherent composite phase measurement and control device based on fringe feature extraction algorithm. After collimated by a collimator, a laser beam outputted by a seed laser passes through a 1 multiple N beam splitter, and then passes through two-stage laser amplification of a pre-amplification stage and an amplification stage, and is reflected to a steric compression device through a separate type deformable mirror. The laser beam with compressed spatial distance is focused on a far field imaging system through a focusing lens. The far field coherent facula fringe acquired by the far field imaging system is analyzed by the fringe feature extraction algorithm built in a computer. The computer applies required control voltage to each electrode of the separate type deformable mirror by controlling a high voltage amplifier. The separate type deformable mirror is controlled to correct the phase difference between multiple paths of laser beams. The device based on the fringe feature extraction algorithm can visually and accurately measure the curve of the translation phase feature that varies with time. Through the power spectral analysis, the control bandwidth required by the system can be determined, and the control process for the coherent composite of multi-laser beam is simpler and more effective.

Description

technical field [0001] The invention belongs to the field of coherent combination of lasers, and in particular relates to a multi-channel laser coherent combination measurement and control device. Background technique [0002] Fiber laser is one of the most cutting-edge research topics in the field of optoelectronic technology research. As a new type of laser device, it has the advantages of high conversion efficiency, low laser threshold, wide tunable range, good beam quality, etc., and has a large heat dissipation area, Compared with conventional bulky gas lasers and solid-state lasers, it has significant advantages due to its small size and long life, and has become an important candidate for lasers in civil and industrial applications. Now the output power of a single fiber laser can reach the kW level, and it is quite difficult to increase the output power of a single fiber laser to a greater extent. In order to achieve high laser output power and near-diffraction-limi...

AI Technical Summary

Problems solved by technology

This measurement method (pinhole + photodetector) can approximately express the spectral characteristics of the translational phase disturbance, but it has two shortcomings that cannot be ignored: one is the output current signal of the diode related to the light intensity or the light spot measured by the CCD camera. There is no one-to-one linear relationship between the intensity signal and the translation phase, that is, the measured signal cannot accurately express the translation phase information; second, this method cannot measure the amplitude value of the translation phase disturbance

The response frequency of this type of device is very high, but there are two fatal flaws: low damage threshold and the inability to adjust the consistent direction of each sub-beam

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