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Mid-infrared ZGP OPO pumped by near-degenerate narrowband type-I PPKTP parametric oscillator

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Abstract

The total pulse energy of the signal and idler in a near-degenerate type-I periodically poled KTiOPO4 (PPKTP) optical parametrical oscillator (OPO) was spectrally confined within a 2 nm spectral bandwidth at 2.13 μm. This was achieved by using a volume Bragg grating as the output coupler. Both the signal and the idler from the PPKTP OPO were then simultaneously used to pump a mid-infrared ZnGeP2 (ZGP) OPO. The 2 nm bandwidth was narrower than the ZGP crystal acceptance bandwidth and, thus, made efficient conversion in the second OPO possible. A total slope efficiency of 10% from 1.06 μm to the 3.5–5 μm region was demonstrated, generating 250 μJ in the mid-IR with only 3.6 mJ of 1.06 μm pump energy. This corresponds to a Nd:YAG pump to mid-IR conversion efficiency of 7%.

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Correspondence to M. Henriksson.

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42.65.Yj; 42.72.Ai; 42.40.Eq

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Henriksson, M., Tiihonen, M., Pasiskevicius, V. et al. Mid-infrared ZGP OPO pumped by near-degenerate narrowband type-I PPKTP parametric oscillator. Appl. Phys. B 88, 37–41 (2007). https://doi.org/10.1007/s00340-007-2661-3

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  • DOI: https://doi.org/10.1007/s00340-007-2661-3

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