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A method to improve the temperature active tracking compensation accuracy of the laser frequency doubling system

A technology of frequency doubling system and compensation accuracy, which is applied in the field of improving the temperature active tracking compensation accuracy of laser frequency doubling system to achieve the effect of improving control accuracy

Active Publication Date: 2020-11-24
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

[0004] Aiming at the temperature change problem of the laser frequency doubling system, the present invention develops the technical route of actively following the temperature compensation of the laser frequency doubling system, and optimizes it from the aspects of the crystal temperature detection method, the crystal best matching angle changing law with temperature, and the angle adjustment mechanism.

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  • A method to improve the temperature active tracking compensation accuracy of the laser frequency doubling system
  • A method to improve the temperature active tracking compensation accuracy of the laser frequency doubling system
  • A method to improve the temperature active tracking compensation accuracy of the laser frequency doubling system

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Embodiment 1

[0030] This embodiment takes the triple frequency process as an example. The wavelength of the fundamental frequency beam is selected as 1053nm, and the aperture of the light is 360mm. The laser frequency doubling system is composed of a class I KDP crystal and a class II DKDP crystal. Placed in a crystal frame whose angle can be adjusted electrically, the adjustment motor is in a zero-current state when it is not working, and the distance from the crystal is 8cm. The crystal sensitive axis adjustment mechanism adopts a grating ruler feedback mechanism, and the reset accuracy is 0.5μm. Three temperature probes are placed in each optical area. The temperature probes are in contact with the crystal surface. The crystal temperature is the average value of the measured values ​​of the three temperature probes. The crystal temperature range is 22°C to 25°C, and 22.3°C, 24.1°C and 24.8°C are selected respectively. Three temperature measurement points, within the test time range of th...

Embodiment 2

[0040] This embodiment takes the quadruple frequency doubling process as an example. The wavelength of the fundamental frequency beam is selected to be 1053nm, and the aperture of the light is 360mm. The laser frequency doubling system is composed of a class I KDP crystal and a class I DKDP crystal. Placed in a crystal frame whose angle can be adjusted electrically, the adjustment motor is in a zero-current state when it is not working, and the distance from the crystal is 8cm. The crystal sensitive axis adjustment mechanism adopts a grating ruler feedback mechanism, and the reset accuracy is 0.5μm. Three temperature probes are placed in each optical area, and the temperature probes are in contact with the crystal surface. The crystal temperature is the average value of the measured values ​​of the three temperature probes. Three temperature measurement points, within the test time range of the frequency doubling system at each temperature measurement point, the temperature cha...

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Abstract

The invention discloses a method for improving temperature active following compensation accuracy of a laser frequency-doubling system. An optimal matching angle of a frequency-doubling crystal is setaccording to a certain temperature, the detuning of the matching angle of the crystal can be caused by temperature fluctuation of an external environment, and the frequency-doubling frequency is reduced. According to a method of detecting a temperature in real time and dynamically adjusting an angle of the frequency-doubling crystal, optimization is performed from aspects of a crystal temperaturedetection method, crystal matching angle changing rule with the temperature and an angle adjustment mechanism, and accurate temperature active following compensation technology of the laser frequency-doubling system is built. By the method, the control accuracy of the optimal matching angle is improved, and a foundation is laid for high-efficiency and stable output of a large-diameter and high-power laser.

Description

technical field [0001] The invention belongs to the field of high-power laser frequency doubling, and in particular relates to a method for improving the temperature active tracking compensation accuracy of a laser frequency doubling system. Background technique [0002] The high-power solid-state laser device can output megajoule-level (MJ, 1MJ=106J) laser energy, petawatt (PW, 1PW=1015W) or even exawatt-level (EW, 1EW=1018W) laser power. Power density can generate extreme state conditions such as super strong electromagnetic field and pressure in the laboratory, providing conditions for research in the fields of high energy density science, strong field physics, laboratory astrophysics, etc., especially those developed in recent decades The research on inertial confinement fusion has attracted the attention of major countries in the world. The representative large-scale laser device is the NIF device in the United States. [0003] The laser frequency doubling system can c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/02
CPCG01J1/0252
Inventor 柴向旭冯斌李平朱德燕朱启华王礼权敬域堃郑奎兴王冠中粟敬钦王芳
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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