An er:yag single-frequency solid-state laser system

Abstract

The invention discloses a method and system for improving the energy and efficiency of an Er: YAG single-frequency solid-state laser, belonging to the technical field of laser. In order to reduce theinfluence of a thermal lens effect and upper energy level effect on laser output, Er: YAG crystal or ceramic with low doping concentration is the first choice of a gain medium. However, due to its lowdoping concentration, in order to achieve high-power and high-energy single-frequency laser output, it is usually necessary to inject a single-frequency seed laser into Q-switched pulsed slave laserand one or more amplifiers. The invention discloses a system for improving the energy and efficiency of an Er: YAG single-frequency solid-state laser, which can obtain a single-frequency laser outputwith large energy in a seed injection mode. The invention can not only solve the problem that the output efficiency of the high-energy single-frequency laser output is low due to adoption of a high-power pumping source and increase of the doping concentration of the gain medium, but also avoids the complex system caused by excessive amplification structure, thereby facilitating the realization ofsmall-sized large-energy single-frequency laser output.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to an Er:YAG single-frequency solid-state laser system, which realizes high-energy and high-efficiency laser output. Background technique [0002] The laser in the 1.6 μm band is eye-safe and is in the atmospheric window (1.5-1.8 μm and 2-2.4 μm), which can meet the requirements of lidar for higher atmospheric transmittance. From the perspective of device maturity, 1.6 μm belongs to the communication band, and various mature devices in the communication band can be directly used, including detectors with high responsivity and optical fiber devices that are easy to miniaturize, so the 1.6 μm lidar is easy to realize miniaturization . From the perspective of absorption of special gas molecules, CH4 gas has abundant absorption peaks in the 1.6 μm band, so 1.6 μm lasers can be used for CH4 differential absorption lidar to achieve fast and real-time detection of CH4 gas. 1.6μm is just in ...

AI Technical Summary

Problems solved by technology

However, due to its low doping concentration, it is difficult to improve the output efficiency

In order to achieve high-power and high-energy single-frequency laser output, existing laser systems usually adopt two methods: the first is to use a high-power pump source and increase the doping concentration of the gain medium. The control system brings a large load, and with the increase of the doping concentration of the gain medium, the influence of the thermal lens effect and the upper energy level conversion effect will also increase, so the overall output efficiency of the laser system will also decrease; the second The first is to use laser power amplification technology. This solution often requires a single-frequency seed laser, a pulse-driven laser, and an amplifier. The system is complex. In order to obtain higher power or energy output, even two or more amplifiers are required. Increased volume of the system

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