A Longitudinal Local Beam Expansion Triple Frequency Laser Terminal Optical System
An optical system, frequency triple technology, applied in optics, lasers, nonlinear optics, etc., can solve problems such as increased cost and system complexity, mismatched optical component loads, increased device operating costs, etc., to save installation space, The effect of reducing system complexity and reducing implementation costs
Inactive Publication Date: 2017-11-14
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology
In order to suppress the laser plasma instability (Laser Plasam Instablity, LPI) problem during the shooting process, it is necessary to convert the frequency of the neodymium glass near-infrared laser into a triple-frequency ultraviolet laser with a shorter wavelength. A serious engineering problem was exposed. The optical components in the ultraviolet section of the triple frequency laser terminal optical system (mainly completing the frequency conversion and beam focusing functions) were severely damaged, which increased the operating cost of the device and reduced the operating efficiency of the device.
In fact, the operation of the optical components of the base frequency band of the device is much better. It can be seen that there is a problem that the load of the optical components of the base frequency band and the triple frequency band does not match. In order to solve this problem, the simplest and most effective way is to use the triple frequency laser The terminal optical system expands the beam to reduce the average flux of the three-frequency laser, but the beam expansion often brings a significant increase in cost and system complexity, and the implementation is very difficult. This patent is proposed to solve this problem
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[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0021] Such as figure 1 As shown, as the tilt angle of the optical element increases, the surface beam area, in vivo beam area, and in vivo path length all increase, while the ratio of in vivo path length to in vivo beam area decreases. For the same input laser energy, this means that the laser flux on the surface of the optical element is reduced, the laser intensity in the body is reduced, the thickness of the laser medium is increased, and the laser intensity in the body is multiplied by the thickness of the laser medium. Linear effects are mitigated. Taking the Brewster's angle placement of optical components as an example, the refractive index is 1.5, the inclination angle is 56.3°, the surface laser flux is reduced by 1.8 times, the laser intensity in the body is reduc...
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Abstract
The invention relates to the field of high-power lasers, in particular to a longitudinal local beam expansion triple frequency laser terminal optical system, comprising: double frequency crystals arranged in sequence along the incident laser transmission direction, a first cylindrical focusing lens, a frequency triple The crystal and the second cylindrical focusing lens, wherein the frequency-tripling crystal and the second cylindrical focusing lens are arranged obliquely, and the frequency-tripping crystal is inclined along its vertical rotation axis, and the second cylindrical focusing The lens is inclined along its horizontal rotation axis, and the vertical rotation axis of the triple frequency crystal and the horizontal rotation axis of the second cylindrical focusing lens are orthogonal to each other. The invention provides a high-energy triple-frequency laser terminal optical system capable of realizing local beam expansion and reducing the average flux of triple-frequency lasers, alleviating serious ultraviolet damage problems, saving implementation costs and reducing system complexity.
Description
technical field [0001] The invention relates to the field of high-power lasers, in particular to a longitudinal local beam-expanding triple frequency laser terminal optical system. Background technique [0002] Inertial Confinement Fusion (ICF) is one of the effective ways to realize controllable thermonuclear fusion, and all major countries in the world are actively carrying out related research. At present, there are many large-scale laser devices that have been built or are being built for ICF research, such as the NIF device in the United States, the LMJ device in France, and the Shenguang series devices in China. Because the neodymium glass laser has the characteristics of high output power and easy control, most devices are designed based on the neodymium glass laser. In order to suppress the laser plasma instability (Laser Plasam Instablity, LPI) problem during the shooting process, it is necessary to convert the frequency of the neodymium glass near-infrared laser i...
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IPC IPC(8): H01S3/109G02F1/35G02F1/37
Inventor 张小民李富全魏晓峰韩伟王芳向勇周丽丹王礼权敬域堃冯斌李明中朱启华郑奎兴粟敬钦胡东霞
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS