Broadband Sum-Frequency Generation of a CO Laser in Antireflection-Coated and Uncoated ZnGeP2 Crystals

We report an experimental study of broadband sum-frequency generation of a nonselective Q -switched CO laser (pulse duration, ~0.3 μs; repetition rate, ~90 Hz) in ZnGeP 2 crystals with and without an antireflective interference coating. The uncoated crystal surface is found to be optically damaged a...

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Bibliographic Details
Published in:Bulletin of the Lebedev Physics Institute 2023-12, Vol.50 (Suppl 12), p.S1341-S1347
Main Authors: Kinyaevskiy, I. O., Klimachev, Yu. M., Ionin, M. V., Sagitova, A. M., Zinov’ev, M. M., Yudin, N. N., Podzyvalov, S. N., Ionin, A. A.
Format: Article
Language:English
Subjects:
Broadband
Crystal surfaces
Laser damage
Lasers
Physics
Physics and Astronomy
Pulse duration
Q switched lasers
Radiant flux density
Radiation damage
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Summary:We report an experimental study of broadband sum-frequency generation of a nonselective Q -switched CO laser (pulse duration, ~0.3 μs; repetition rate, ~90 Hz) in ZnGeP 2 crystals with and without an antireflective interference coating. The uncoated crystal surface is found to be optically damaged at a laser radiation intensity of 0.033 GW/cm 2 . Under the same conditions, no damage to the antireflection-coated surface of the crystal is observed. The maximum efficiency of broadband sum-frequency generation of the CO laser in the antireflection-coated sample is 4.8% and turns out to be two times higher than in the uncoated sample. The spectral characteristics of the radiation at sum frequencies do not change in using antireflection-coated and uncoated samples.
ISSN:1068-3356
1934-838X
DOI:10.3103/S1068335623602261