Neodymium and yttrium doped calcium fluoride laser amplifier of laser diode pumping helium cooling

Abstract

A neodymium and yttrium doped calcium fluoride laser amplifier of laser diode pumping helium cooling is composed of a pumping source, a coupling lens set, a spectroscope and an amplification gain medium. The amplification gain medium is actively cooled through high-speed helium, the temperature distribution evenness of the amplification gain medium is improved, the largest thermal stress is reduced, and the thermal management effect is improved; meanwhile, spontaneous emission amplification is reduced, energy storage efficiency is improved, lasers with high average power, high repetition frequency and high beam quality can be outputted, and the neodymium and yttrium doped calcium fluoride laser amplifier has the advantages of being compact in structure, good in reliability and high in efficiency.

Description

technical field [0001] The invention relates to repetition frequency and high power laser amplifiers, in particular to a laser diode pumped helium gas cooled Nd-doped yttrium calcium fluoride laser amplifier. Background technique [0002] Future energy has always been a major issue of common concern to all countries in the world, and fusion power plants are a solution that can be considered. On the one hand, fusion does not produce chemical pollution or greenhouse gases, and is inherently safe and clean. On the other hand, fusion power plants also produce hydrogen, which can be used for transportation in petrochemical and fuel cell functions, thereby reducing dependence on imported oil , so fusion research has always been a hot topic in the field of scientific research. From the "Janus" laser system in the mid-1970s. Large neodymium glass laser systems pumped by flash lamps have come a long way from what is now the National Ignition Facility (NIF). However, their overall ...

AI Technical Summary

Problems solved by technology

[0005] In addition, in terms of end-pumped laser amplifiers, the crystal structure with a single doping concentration is mainly used at home and abroad. While improving the absorption efficiency of pump light, it also has the problem of uneven pump power density in the laser medium. A large temperature gradient is generated in the pumping direction, resulting in a large thermal stress. This contradiction also greatly restricts the further improvement of the laser power.

Images