Shen Guang Ⅱ consists of six parts: laser system, laser beam automatic collimation system, laser precision shooting range system, laser parameter measurement system, laser energy storage and power supply system (bottom right), environmental protection and precision ultra-clean assembly calibration system. It is the integration of hundreds of laser units or components, which are spatially arranged into eight laser amplification chains, and the net diameter of each laser amplification chain terminal is φ 230 mm. It has two pulse widths, 1ns and 100ps, and three wavelengths, 1.053μm, 0.53μm and 0.35μm m. The terminal output energy of the device reaches 6kJ/1ns/1.053μ m. High power laser. Shen Guang Ⅱ independently solved a series of technical problems and innovatively integrated a number of new unit technologies.
Mainly includes:
A switch-free coaxial dual-channel chip main amplifier was designed and developed, and it was put into operation for the first time in the world.
The innovative small circular screen technology with filter holes in coaxial dual-pass main amplifier solves the output capacity problem of main amplifier.
The core technology of Q-switched loss modulated single longitudinal mode laser oscillator was pioneered, and the high stable output in Shen Guang II operation attracted the attention of international peers.
Innovative time-space conversion laser pulse shaping technology controlled by high stability cold cathode thyratron.
In order to solve the problem of accurate aiming of laser targets, a high-precision ICF shooting range simulation light technology with strict coaxial fundamental frequency tripling was invented independently.
The innovative design of convex cylindrical lens array with high uniform line focusing is solved.
A new technology of flat-topped super-Gaussian sawtooth soft-edged aperture with high laser damage threshold for dielectric films.
The characteristic moisture-proof and antireflection film was made on the surface of the third harmonic crystal with high laser damage threshold by chemical method.
Efficient and fast automatic collimation technology solves the key point of high-precision automatic collimation and aiming of the whole laser device system. The overall technical level of Shen Guang Ⅱ has reached the forefront level of similar devices in the world.
Mainly manifested in:
The output energy of a single laser with fundamental frequency is equivalent to that of American Omega.
The quality of laser output beam reaches the same technical parameter level of similar devices in the world, which is equivalent to the technical index of Omega in the United States. The output laser flux, equivalent focusable power density and space-time signal-to-noise ratio of the device have reached the international advanced level. It provides an efficient experimental platform for physical experiments.
The near-field filling factor of laser beam, which represents the design of laser driver and beam control level, is about 50%, which is equivalent to the level of Gekko-XII in Japan, but still lower than 75% of OMEGA devices in the United States.
The output of tripling laser is higher than Gekko-XII of Japan, the laser external conversion efficiency is about 60%, and the daily operation stability is high. It is similar to the highest internal conversion efficiency of 75% of American Omega devices.
Using new technical route and characteristic CCD parallel image processing technology, the automatic collimation and high-precision adjustment of the whole system optical path can be realized in about 30 minutes, which effectively improves the efficiency of automatic collimation of the optical path, and the overall technical level is higher than that of Gekko-XII optical path automatic collimation adjustment process in Japan.