Low-quantum-loss sheet laser and laser output method thereof

Abstract

The invention provides a low-quantum-loss sheet laser. The laser comprises a first resonant cavity which comprises a dichroic mirror, a first sheet gain module, and a second sheet gain module; and a second resonant cavity which comprises a 1030nm / 1048nm high-reflectivity mirror and a coupling output mirror. The second resonant cavity and the first resonant cavity share the first sheet gain module;the first resonant cavity generates 1030 nm laser, and pumps the first sheet gain module to enable the first sheet gain module to generate population inversion, so the second resonant cavity generates oscillation, and the 1048 nm laser beam is output from the coupling output mirror. The invention further provides a laser output method. The laser and the method are low in energy quantum loss, goodin light beam quality and high in output power.

Description

technical field [0001] The invention relates to a thin slice laser, in particular to a thin slice laser with low quantum defect. Background technique [0002] Thin-sheet lasers are an important development direction of high-average-power lasers. The heat dissipation characteristics of laser media are an important factor affecting the development of high-power lasers. Thin-sheet lasers use crystals with a thickness of 100-200 μm as gain media. The diamond with the highest thermal conductivity is welded, so it can efficiently transfer the heat in the crystal to the heat sink; in addition, with the support of backside cooling technology and end-face flat-top pump light, this structure can produce a laser gain medium perpendicular to the sheet The surface and almost uniform axial one-dimensional heat flow can reduce the thermal lens effect and heat deposition in the gain medium, making it possible to maintain high efficiency and high beam quality while obtaining high-power laser...

AI Technical Summary

Problems solved by technology

There is not much difference between using conventional 940nm pumping and using 969nm at low power, but for 940nm pumping, as the pump power increases, the heat accumulation gradually increases, which will deteriorate the wavefront of the laser and change the stability of the cavity, Thus deteriorating the output beam quality of the laser and limiting the further improvement of the laser power

In order to obtain a higher average laser power output, a 969nm VBG wavelength-locked LD can be used as the pump source of the Yb:YAG thin-plate laser. Using this scheme, the particles in the ground state can be directly pumped to the upper energy level of the laser, reducing the laser energy consumption. The quantum loss of the gain crystal, through this scheme, a higher laser output than the traditional 940nm pump can be obtained, but the laser output power of this method is limited by the power of the 969nm pump LD

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