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Abstract
Using an 8 µm long-wave infrared laser as the fundamental wave, we achieved second-harmonic generation (SHG) and sum-frequency generation simultaneously in ${{\rm AgGaGe}_5}{{\rm Se}_{12}}$ and obtained a 4 µm laser output. Among them, SHG was achieved in the 173 nm spectral range of the fundamental wave, which was consistent with theoretical calculations. The average power of the obtained 4 µm laser was 41 mW, corresponding to an optical-to-optical conversion efficiency of 3.2%. The measured temperature acceptance bandwidth ($L\delta T$) (FWHM) was 50 K·cm; the angular acceptance bandwidth ($L\delta \theta$) (FWHM) was 13.3 mrad·cm; and the average absorption coefficient in the wavelength range of 0.86–11.30 µm was ${0.07}\;{{\rm cm}^{- 1}}$. In addition, the spectral acceptance bandwidth ($L\delta \lambda$) of fundamental wave in ${{\rm AgGaGe}_5}{{\rm Se}_{12}}$ SHG and the spectral gain bandwidth of frequency downconversion in ${{\rm AgGaGe}_5}{{\rm Se}_{12}}$ were calculated. In view of the small absorption coefficient, the large temperature acceptance bandwidth, and the large spectral gain bandwidth, we conclude that ${{\rm AgGaGe}_5}{{\rm Se}_{12}}$ is a suitable nonlinear crystal for high-power short/mid/long-wave infrared lasers and frequency conversions of nanosecond-femtosecond infrared lasers. These results are conducive to the further development of ${{\rm AgGaGe}_5}{{\rm Se}_{12}}$ lasers.
© 2020 Optical Society of America
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