Cascade 2-mu m solid laser of double-wavelength mixed pumping

Abstract

The invention relates to a cascade 2-mu m solid laser of double-wavelength mixed pumping, which belongs to the technical field of laser. Pumping light output by a double-wavelength mixed pumping source is focused on 2-mu m laser crystals, the 2-mu m laser crystals absorb the pumping light with different wavelengths lambda 1 and lambda 2 and obtain gains, the two 2-mu m laser crystals are cascadedto realize laser oscillation in a laser resonator comprising a laser totally reflecting mirror, a laser reflecting mirror of 45 degrees and a laser output mirror, and 2-mu m laser is output from the laser output mirror. The invention has the advantages that the absorption of the 2-mu m laser crystals to the pumping light can be increased, the thermal lens effect of the 2-mu m laser crystals is decreased, and the quality of the light beam of the 2-mu m output light is improved, thereby obtaining the output of the 2-mu m laser with high power and high efficiency.

Description

technical field [0001] The invention relates to a 2 μm cascaded solid-state laser with dual-wavelength mixed pumping, belonging to the technical field of lasers. Background technique [0002] Solid-state lasers with an output wavelength around 2 μm have very important application prospects in laser medical treatment and lidar. However, compared with four-level lasers such as Nd:YAG lasers with an output wavelength of 1.064 μm, lasers with an output wavelength near 2 μm are mostly quasi-three-level lasers, which have disadvantages such as high pumping threshold, low efficiency, and severe thermal effects. For the 2μm laser system pumped by the end surface of the semiconductor diode, since the absorption coefficient of the 2μm laser crystal to the pump light of the semiconductor diode (currently the pump light with a wavelength of 785nm, 793nm or 804nm is commonly used) is small, in order to increase the laser crystal to the pump light To absorb light and achieve high-power 2...

AI Technical Summary

Problems solved by technology

However, the current semiconductor laser with a wavelength near 785nm is not yet mature enough to output high power due to technological reasons, and the single-end pumping of a 2μm laser crystal by a high-power semiconductor laser is likely to cause serious thermal lens effects in the laser crystal, thus making the laser The deterioration of the beam quality also affects the output power and efficiency of the laser

On the other hand, if a highly doped 2 μm laser crystal is used, although this method can increase the absorption of the pump light by the laser crystal, it is easy to cause the fluorescence concentration quenching effect of the 2 μm laser crystal in the case of semiconductor pumping. Lead to the reduction of laser efficiency, which is not conducive to improving the output power of the laser

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