System for measuring frequency conversion efficiency of laser frequency doubling crystal and performance characterizing method

Abstract

The invention discloses a system for measuring the frequency conversion efficiency of a laser frequency doubling crystal and a performance characterizing method. The system comprises a high-rigidity substrate, a carrier board, a crystal fixing frame, an X-direction precision electric translation stage, a Y-direction precision electric translation stage, a laser and a laser receiver. Through alternate incontinuous movement of the X-direction translation stage and the Y-direction translation stage, the laser receiver performs point-by-point sampling on the surface of a light aperture of the frequency doubling crystal to obtain a laser power value after frequency doubling; during frequency conversion performance characterizing operation on large-aperture laser frequency doubling crystal in ahigh-cleanness optical measuring environment, after initial operation, the measuring system can automatically complete the sampling operation according to a specific trajectory under the control of acontroller module thereof and calculate a value (FORMULA) for characterizing the frequency conversion performance of the frequency doubling crystal. The measuring system can meet the need of efficientand precision measurement of the frequency conversion efficiency of the large-aperture laser frequency doubling crystal, adopts a scientific and concise characterizing method, and is applicable to research on influence on the frequency conversion efficiency of the frequency doubling crystal in a high-power inertial confinement fusion laser as well as on-site assembly and calibration test.

Description

technical field [0001] The invention belongs to the technical field of precision measurement of optical components, and relates to the precise measurement of the frequency conversion efficiency of a large-diameter frequency-doubling crystal element in a high-power solid-state laser driver, in particular to a frequency conversion efficiency measurement system and a performance characterization method of a laser frequency-doubling crystal. Background technique [0002] Laser frequency doubling is the use of the secondary nonlinear effect of nonlinear crystals under the action of strong lasers, so that the laser with frequency ω passes through the crystal and becomes frequency-doubled light with frequency 2ω. In high-power solid-state laser drivers, the second harmonic conversion of high-energy laser beams is usually realized by large-aperture KDP crystals. Different crystal growth methods, processing methods and assembly processes will lead to changes in the surface shape accu...

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Problems solved by technology

[0003] At present, the measurement of the frequency conversion efficiency of the large-aperture KDP crystal element in my country's largest high-power solid-state laser driver adopts the method of center point detection. However, in actual working conditions, the aperture of each laser beam exceeds 300mm. Due to the change of shape accuracy and refractive index uniformity, the frequency doubling efficiency value obtained by only using the center point measurement cannot accurately characterize the frequency conversion efficiency of the KDP crystal in the entire optical aperture.

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