Refined Sellmeier equations for BaGa4S7.

This paper reports refined Sellmeier equations for the biaxial nonlinear crystal BaGa4S7 that provide a good reproduction of the phase-matching angles for second-harmonic generation (SHG) and sum-frequency generation (SFG) of the mid-IR outputs of Nd:YAG and Ho:YLF laser-pumped optical parametric oscillators (OPOs) and a frequency-doubled CO2 laser in the 0.7584-8.018 µm range. The theoretical results are found to agree with the recent experimental data for 1-µm-pumped optical parametric processes based on BaGa4S7 beyond 8 µm.

[1]  M. Mero,et al.  Barium nonlinear optical crystals for the mid-IR: characterization and some applications , 2021, Journal of the Optical Society of America B.

[2]  V. Petrov,et al.  Few-cycle, μJ-level pulses beyond 5 μm from 1-μm-pumped OPA's based on non-oxide nonlinear crystals , 2021, LASE.

[3]  Zu-Yan Xu,et al.  Tunable mid-IR optical parametric amplifier pumped at 1064 nm based on a wideband-gap BaGa4S7 crystal , 2020 .

[4]  V. Petrov,et al.  Efficient, sub-4-cycle, 1-µm-pumped optical parametric amplifier at 10  µm based on BaGa4S7. , 2020, Optics letters.

[5]  Valentin Petrov,et al.  Progress in ultrafast, mid-infrared optical parametric chirped pulse amplifiers pumped at 1 µm , 2020, LASE.

[6]  P. Schunemann,et al.  Single Crystal Growth of BaGa4S7 and BaGa4Se7 by the Horizontal Gradient Freeze Technique , 2018, 2018 Conference on Lasers and Electro-Optics (CLEO).

[7]  Kiyoshi Kato,et al.  Temperature-tuned 90° phase-matched SHG and DFG in BaGa4S7 , 2015, Photonics West - Lasers and Applications in Science and Engineering.

[8]  Kiyoshi Kato,et al.  Fourth-harmonic generation of the CO2 laser wavelength at 10.5910 μm in BaGa4S7 , 2013, Photonics West - Lasers and Applications in Science and Engineering.

[9]  Aleksey Tyazhev,et al.  Midinfrared optical parametric oscillator based on the wide-bandgap BaGa4S7 nonlinear crystal. , 2012, Optics letters.

[10]  V. Petrov,et al.  BaGa_4S_7: wide-bandgap phase-matchable nonlinear crystal for the mid-infrared , 2011 .

[11]  V. Petrov,et al.  Phase‐matching properties of BaGa4S7 and BaGa4Se7: Wide‐bandgap nonlinear crystals for the mid‐infrared , 2011 .

[12]  Ning Ye,et al.  Growth and Characterization of BaGa4S7: A New Crystal for Mid-IR Nonlinear Optics , 2009 .