Abstract
We report the development of a combined optical parametric oscillator based on a fan-out MgO:PPLN crystal and a HgGa2S4 crystal, providing smooth wavelength tuning in the spectral range from 2.5 to 10.8 μm. A transversely pumped Nd:YAG laser with a pulse energy of ∼4 mJ and a spatial beam distribution described by a second-order Gaussian function along the x axis and a fourth-order Gaussian function along the y axis is used as a pump source. A maximum achievable radiation energy of the optical parametric oscillator is at a level of 360 μJ for a wavelength of 3.3 μm, 130 μJ for a wavelength of 4.73 μm, and 110 μJ for a wavelength of 7.40 μm. The developed radiation source is used to record absorption spectra of gas mixtures of methane, propane and nitrogen dioxide.
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ACKNOWLEDGMENTS
The authors would like to thank the Optical Crystal Laboratory LLC for the provided equipment and useful discussions.
Funding
The work was supported by the Russian Science Foundation (scientific project no. 17-72-30006-P).
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Erushin, E., Yakovin, M., Latkin, N. et al. Tunable Optical Parametric Oscillator Based on MgO:PPLN and HgGa2S4 Crystals Pumped by an Nd:YAG Laser with Increased Energy Characteristics. Bull. Lebedev Phys. Inst. 51 (Suppl 1), S39–S50 (2024). https://doi.org/10.3103/S1068335624600190
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DOI: https://doi.org/10.3103/S1068335624600190