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

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Abstract

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 ZnGeP2 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/cm2. 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.

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Funding

The work was supported by the Russian Science Foundation (grant no. 22-22-20103) and the Administration of the Tomsk oblast.

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Correspondence to I. O. Kinyaevskiy.

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Translated by I. Ulitkin

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Kinyaevskiy, I., Klimachev, Y., Ionin, M. et al. Broadband Sum-Frequency Generation of a CO Laser in Antireflection-Coated and Uncoated ZnGeP2 Crystals. Bull. Lebedev Phys. Inst. 50 (Suppl 12), S1341–S1347 (2023). https://doi.org/10.3103/S1068335623602261

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