Recently, Sun Dunlu, a researcher at the Laser Technology Center of Anhui Institute of Optics and Fine Mechanics, Institute of Material Science, Chinese Academy of Sciences, made a series of progress in the study of 2.79 micron infrared laser crystals.
2.7 micron to 3 micron mid-infrared lasers have important application prospects in spectral analysis, gas detection, laser medical and optical parametric oscillation pumping. Based on the previous research work, Sun Dun's research group further optimized the doping concentration of new high-efficiency radiation-resistant mid-infrared laser crystals Cr, Er, Pr:GYSGG, and theoretically analyzed the thermal distribution of crystals using COMSOL software; The analysis results show that the pure GYSGG crystal is bonded to both ends of the crystal as a heat sink by thermal bonding (pure GYSGG has higher thermal conductivity than Cr, Er, Pr:GYSGG, no activated ions, no heat, Can be used as a heat sink), which accelerates the heat dissipation rate of the laser crystal rod at both ends, and effectively improves the thermal lens effect of the crystal, thereby further improving the laser performance of the Cr, Er, Pr: GYSGG crystal.
In addition, Cr, Er: YSGG is a relatively mature mid-infrared laser crystal. Cr3+ ions can increase the flash pumping efficiency of the crystal after being doped, but the Cr3+ ion doping concentration needs to be further optimized. The research group used the Czochralski method to grow two different doping concentrations of Cr and Er:YSGG crystals, and compared their absorption, fluorescence spectrum, energy level lifetime and laser performance. The results show that the concentration is 3at% Cr3+ Among the mixed crystals, the parameters such as output power and laser oblique efficiency are greatly improved.
Related research results were published on Optics Express. The research was funded by the National Natural Science Foundation and the National High Technology Research and Development Program.
Essay topic:
Influence of Cr3+concentration on the spectroscopy and laser performance of Cr,Er:YSGG crystal
Thermal analysis and laser performance of a GYSGG/Cr,Er,Pr:GYSGG composite laser crystal operated at 2.79 μm
Schematic diagram of xenon lamp pumping GYSGG/Cr, Er, Pr: GYSGG laser crystal
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