Broadband second-harmonic and sum-frequency generation with a long-wave infrared laser in AgGaGe5Se12
2020
Using an 8 µm long-wave infrared laser as the fundamental wave, we
achieved second-harmonic generation (SHG) and sum-frequency generation
simultaneously in
AgGaGe5Se12
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
(LδT) (FWHM) was 50 K·cm; the angular acceptance
bandwidth (Lδθ) (FWHM) was 13.3 mrad·cm; and the
average absorption coefficient in the wavelength range of 0.86–11.30 µm
was 0.07cm−1. In addition, the spectral
acceptance bandwidth (Lδλ) of fundamental wave in
AgGaGe5Se12
SHG and the spectral gain bandwidth of frequency downconversion in
AgGaGe5Se12
were calculated. In view of the small absorption coefficient, the large
temperature acceptance bandwidth, and the large spectral gain bandwidth,
we conclude that
AgGaGe5Se12
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
AgGaGe5Se12
lasers.
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