E. Yu. Erushin, M. D. Yakovin, N. I. Latkin, S. N. Podzyvalov, N. Yu. Kostyukova, A. A. Boyko
- Novosibirsk State University, 630090, Novosibirsk, Russia
- Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia
- Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia
- National Research Tomsk State University, 634050, Tomsk, Russia
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.
Keywords: optical parametric oscillator, nonlinear crystal, pulsed pump laser, laser photoacoustic spectroscopy.
The work was supported by the Russian Science Foundation (scientific project no. 17-72-30006-P).
Received: 10.09.2023
Revised: 28.11.2023
Accepted: 28.11.2023