4 November 2010 Generation of tunable coherent nanosecond 8-12μm mid-infrared pulses based on difference frequency generation in GaSe and ZnGeP2
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Abstract
Based on the theoretical analysis on the phase-matching relations, effective nonlinear coefficients, walk-off and acceptance angles, the generation of tunable and coherent nanosecond mid-infrared radiation covering the 8-12μm range is realized by use of difference frequency generation (DFG) in a GaSe and a ZnGeP2 (ZGP) crystal. Using an 8-mm-long GaSe crystal, we achieve the mid-infrared generation that is continuously tunable from 8.28μm to 18.365μm. The maximum pulse energy is 31μJ at 8.76μm, corresponding to the conversion efficiency of 0.9% and the maximum midinfrared peak power of about 7kW. In the case of using an 8-mm-long ZGP crystal, the tuning range is from 7.2μm to 12.2μm. The maximum pulse energy is about 10μJ at 9.22μm, corresponding to the conversion efficiency of 0.45% and the peak power of 2.2kW.
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Kai Zhong, Kai Zhong, Jianquan Yao, Jianquan Yao, Jiansong Li, Jiansong Li, Degang Xu, Degang Xu, Peng Wang, Peng Wang, } "Generation of tunable coherent nanosecond 8-12μm mid-infrared pulses based on difference frequency generation in GaSe and ZnGeP2", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460S (4 November 2010); doi: 10.1117/12.868562; https://doi.org/10.1117/12.868562
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