Quaternary nonlinear crystals of AgxGaxGe1-xSe2 with orthorhombic symmetry for the mid-infrared spectral range

Vladimir Panyutin; Valeriy Badikov; Galina Shevyrdyaeva; Konstantin Mitin; Alexander Seryogin; Valentin Petrov; Frank Noack

doi:10.1117/12.761018

13 February 2008 Quaternary nonlinear crystals of Ag_xGa_xGe_1-xSe₂ with orthorhombic symmetry for the mid-infrared spectral range

Vladimir Panyutin, Valeriy Badikov, Galina Shevyrdyaeva, Konstantin Mitin, Alexander Seryogin, Valentin Petrov, Frank Noack

Author Affiliations +

Proceedings Volume 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII; 68750A (2008) https://doi.org/10.1117/12.761018
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

We present a systematic study of the birefringence (including Sellmeier equations valid in the 0.6-11.5 μm range) and nonlinearity of the orthorhombic AgGaGe_nSe_2(n+1) crystals for n=2...5, solid solutions in the system AgGaSe₂-nGeSe₂. The birefringence, e.g. n_a-n_c at 1064.2 nm, increases from 0.114 for n=2 (AgGaGe₂Se₆) to 0.149 for n=5 (AgGaGe₅Se₁₂) which substantially exceeds the birefringence of the uniaxial AgGaSe₂ (~0.022), the parent compound in the limit n=0. All four quaternary compounds are optically negative biaxial crystals. The calculated SHG limit (minimum fundamental wavelength) is ≈1470 nm for AgGaGe₂Se₆ and ≈1240 nm for AgGaGe₅Se₁₂, for type-I interaction and propagation along the Y principal optical axis. These limits are much lower than the ≈3120 nm limit for type-I interaction in AgGaSe₂. Thus, the AgGaGe_nSe_2(n+1) crystals can be used for SHG down to their band-edge. The results for the nonlinear coefficients of AgGaGe_nSe_2(n+1) (n=3, 4 and 5), obtained from phase-matched SHG, indicate weak dependence on the composition. On the average, the larger nonlinear coefficient d₃₁ is very close to d₃₆ of AgGaSe₂ (~30 pm/V) while d₃₂ is roughly two times smaller.

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Vladimir Panyutin, Valeriy Badikov, Galina Shevyrdyaeva, Konstantin Mitin, Alexander Seryogin, Valentin Petrov, and Frank Noack "Quaternary nonlinear crystals of Ag_xGa_xGe_1-xSe₂ with orthorhombic symmetry for the mid-infrared spectral range", Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68750A (13 February 2008); https://doi.org/10.1117/12.761018

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