Sellmeier and thermo-optic dispersion formulas for BaGa2GeS6

Kiyoshi Kato; Nobuhiro Umemura; Valeriy V. Badikov; Dmitrii V. Badikov; Takayuki Okamoto; Kentaro Miyata; Valentin Petrov

doi:10.1117/12.2648272

14 March 2023 Sellmeier and thermo-optic dispersion formulas for BaGa₂GeS₆

Kiyoshi Kato, Nobuhiro Umemura, Valeriy V. Badikov, Dmitrii V. Badikov, Takayuki Okamoto, Kentaro Miyata, Valentin Petrov

Author Affiliations +

Proceedings Volume 12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII; 124050E (2023) https://doi.org/10.1117/12.2648272
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

We report the experimental results on the temperature-dependent phase-matching properties of BaGa₂GeS₆ for second-harmonic generation (SHG) and sum-frequency generation (SFG) of Nd:YAG laser-pumped KTiOPO₄ (KTP) and HgGa₂S₄ (HGS) optical parametric oscillators (OPOs) and a CO₂ laser in the 0.7674-10.5910 μm range. The experimental values for type-2 90° phase-matching SHG wavelengths in the short and long wavelength branches were measured to be λ1 = 2.0376 and 7.6740 μm, respectively. By using a BaGa₂GeS₆ crystal cut at θ = 48.1˚ and Φ = 0˚, we measured the type-1 and type-2 phase-matching angles for SHG and SFG of a Nd:YAG laser-pumped KTP OPO at λ = 3.1092 μm and HGS OPO at λ = 7.6740 μm as well as those for SHG and SFG of a waveguide CO₂ laser. In addition, we derived the Sellmeier equations that provide a good reproduction of the experimental results for the phase-matching data. The temperature phase-matching bandwidths (FWHM) were also obtained in eight different phase-matching conditions by using the measured temperature variation of the pump wavelengths, the measured temperature dependence of the phase-matching angles (Δθ_ext/ΔT) from 20℃ to 120℃ and the angular acceptance (Δθ_ext‧l) calculated with our Sellmeier equations. Moreover, the temperature phase-matching bandwidth (FWHM) for type-2 90˚ phase-matching SHG was determined to be ΔT‧l = 12.2 ℃‧cm from the measured value of dλ₁/dT = +0.3 nm/℃ and the calculated spectral bandwidth (Δλ₁‧l). From these experimental results and the dn/dT measured at five wavelengths, we derived a thermo-optic dispersion formula valid in the 0.7674 − 10.5910 μm spectral range.

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Kiyoshi Kato, Nobuhiro Umemura, Valeriy V. Badikov, Dmitrii V. Badikov, Takayuki Okamoto, Kentaro Miyata, and Valentin Petrov "Sellmeier and thermo-optic dispersion formulas for BaGa₂GeS₆", Proc. SPIE 12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII, 124050E (14 March 2023); https://doi.org/10.1117/12.2648272

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