Low-threshold high-efficiency pico-second mode-locked Tm,Ho:LiLuF4 laser device

Abstract

The invention, which belongs to the technical field of the laser, discloses a low-threshold high-efficiency pico-second mode-locked Tm,Ho:LiLuF4 laser device comprising a pump source, a focusing lens,a Tm,Ho:LiLuF4 laser gain medium, a low-threshold laser resonant cavity, a semiconductor saturable absorber mirror, and a prism. The pump source is used for generating pumping laser with the wavelength of 780.5 nm; the focusing lens is used for carrying out high transmittance processing on the pumping laser to focus the pumping laser in a crystal; the Tm,Ho:LiLuF4 laser gain medium is used for changing the pumping laser with the center wavelength of 780.5 nm into laser with the center wavelength of 1895 nm; the low-threshold laser resonant cavity is used for realizing low threshold laser operation; the semiconductor saturable absorber mirror is used for transforming output continuous light into mode-locked pulse light; and the prism is used for providing dispersion compensation for the resonant cavity. According to the invention, the low-threshold high-efficiency pico-second mode-locked Tm,Ho:LiLuF4 laser device has advantages of low threshold, high efficiency, and simple operation and is able to support a mode-locked pulse output with the shortest time of 12ps.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a low-threshold high-efficiency picosecond mode-locked Tm,Ho:LiLuF 4 laser. Background technique [0002] Eye-safe 2μm band picosecond mode-locked Tm,Ho:LiLuF 4 The laser, whose central wavelength is 1895nm, is located in the strong absorption band of water molecules 1800-2000nm, and has great application potential. It can be used as an ideal light source for laser rangefinders, coherent Doppler wind radars, water vapor throwing surface differential absorption lidar systems, laser eye surgery, and laser micromachining. The current commercialized 2μm band mode-locked laser mainly adopts passive mode-locked technology and uses Ti:Sapphire laser as the pump source. The laser has high output beam quality and stable performance, and is suitable as a light source for instruments, especially precision instruments. However, the entire system of this type of laser consists of three part...

AI Technical Summary

Problems solved by technology

[0003] In summary, the existing problems in the prior art are: the existing lasers are expensive and limit the application

On the basis of the traditional X-shaped four-mirror cavity, the second folding mirror with a smaller radius of curvature of the concave surface is selected, thereby reducing the light threshold of the laser and improving the oblique efficiency and light-to-light conversion efficiency of the laser, but the smaller radius of curvature of the concave surface The second folding mirror narrows the stable region of the laser cavity and increases the difficulty of adjusting the laser resonator, so few people study it

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