Method for generating two-micron band single wavelength stable laser output and laser device

Abstract

The invention relates to a method for generating two-micron band single wavelength stable laser output and a laser device. The two-micron band single wavelength stable laser output can be obtained only by adjusting the parameter values of the crystal Tm doped concentration, the crystal length and the transmittance of the output mirror without changing the parameters of other devices so that blindadjustment of various device parameters in the prior art can be effectively avoided. Moreover, the power upgrading method is simple and the high-power laser output can be conveniently obtained.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers, in particular to a method and a laser device for generating a single-wavelength stable high-power laser output in a 2-micron band. Background technique [0002] The 2-micron band is in the atmospheric transmission window and is safe for human eyes. At the same time, there are abundant water molecule absorption peaks and carbon dioxide greenhouse gas absorption peaks in the band. It has broad application prospects in lidar, laser medical and other fields. There are three main ways to obtain a 2-micron laser. One is based on the nonlinear effect, using a 1-micron band laser with relatively mature technology and technology as the fundamental frequency light, and interacting with a nonlinear crystal to generate a 2-micron band laser output. This scheme The advantage is that the device and technology are mature, and the disadvantage is that the conversion efficiency is low; the second is ba...

AI Technical Summary

Problems solved by technology

However, 1) the pump power injected by bulk crystals is limited, which limits its power upgrade; 2) multiple crystals are cascaded, the structure is complex, and the cost is high; 3) F-P etalons, Brewster plates, etc. are inserted into the cavity Devices increase intracavity loss, affect laser efficiency, and increase the risk of device damage

[0007] In recent years, there have been some reports on the use of end-pumped slab structures. As described in Laser Phys.Lett.10 (2013), Tm:YLF can be used to obtain high-power laser output, and the laser can be changed by inserting a Brewster sheet into the cavity. The polarization direction to select the wavelength, but only two wavelengths can be selected

In addition, for slab lasers, if wavelength selection devices are used to achieve wavelength selection, it means that large-sized VBGs, F-P etalons, etc. are required, which increases processing difficulty and is expensive

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