Large-aperture laser frequency conversion system and method with efficient frequency multiplication performance

Abstract

The invention discloses a large-aperture laser frequency conversion system with efficient frequency multiplication performance. The large-aperture laser frequency conversion system comprises a deformable mirror, a driver of the deformable mirror, a frequency multiplication crystal, a calculation control processor, a convergent lens and a machine shell assembly. The deformable mirror, the frequencydoubling crystal and the convergent lens are arranged on the same optical axis. The included angle between the mirror surface normal of the deformable mirror and the incident light direction is 45 degrees, and the optical axes of the mirror surface normal of the frequency doubling crystal and the convergent lens coincide with the incident light direction. The frequency doubling crystal has surface shape distortion in an actual working environment, and plane waves deviate from angle phase matching during incidence, so that the frequency doubling efficiency is reduced. According to the invention, through offline measurement before working, a distorted surface shape of the frequency doubling crystal and a response function of the deformable mirror and the driver thereof are obtained. The driving voltage required by the deformable mirror driver for compensating the surface shape distortion of the frequency doubling crystal and correcting the output light wavefront is calculated, and the driver is controlled to load the calculated driving voltage during working, so that the effects of realizing accurate angle phase matching, improving the frequency doubling efficiency and improving theoutput light collimation can be achieved.

Description

technical field [0001] The invention belongs to the field of laser application technology, and relates to the improvement of frequency doubling efficiency in a high-power solid-state laser driver in a laser inertial confinement fusion device, in particular to a large-diameter laser frequency conversion system and method with high-efficiency frequency doubling performance. Background technique [0002] In the high-power solid-state laser driver in the laser inertial confinement fusion device, frequency doubling is an indispensable process before laser output. The frequency doubling efficiency and the wavefront shape quality of the outgoing light directly affect the effect of laser targeting. Angle phase matching is an important condition for generating frequency-doubling light. Specifically, when the angle between the incident light and the optical axis of the frequency-doubling crystal is a specific angle, the frequency-doubling efficiency is the largest. Therefore, it is gen...

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Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art, and further solve the current problem that the large-diameter frequency-doubling crystal is deformed due to factors such as gravity in the actual working environment, resulting in a decrease in the frequency-doubling efficiency, the present invention utilizes the principle and means of adaptive optics, from the active Starting from the idea of ​​changing the incident light wavefront to compensate for the deformation of the frequency-doubling crystal, a large-aperture laser frequency conversion system and method with high frequency-doubling efficiency is provided, and the angular phase matching is improved by adjusting the incident light wavefront, thereby improving the frequency-doubling efficiency; and At the exit end, the wavefront of the outgoing light is also corrected by the method of wavefront regulation, which improves its collimation

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