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Proceedings Paper

Quaternary nonlinear crystals of AgxGaxGe1-xSe2 with orthorhombic symmetry for the mid-infrared spectral range
Author(s): Vladimir Panyutin; Valeriy Badikov; Galina Shevyrdyaeva; Konstantin Mitin; Alexander Seryogin; Valentin Petrov; Frank Noack
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Paper 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 AgGaGenSe2(n+1) crystals for n=2...5, solid solutions in the system AgGaSe2-nGeSe2. The birefringence, e.g. na-nc 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 AgGaGenSe2(n+1) crystals can be used for SHG down to their band-edge. The results for the nonlinear coefficients of AgGaGenSe2(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.

Paper Details

Date Published: 13 February 2008
PDF: 12 pages
Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68750A (13 February 2008); doi: 10.1117/12.761018
Show Author Affiliations
Vladimir Panyutin, Kuban State Univ. (Russia)
Valeriy Badikov, Kuban State Univ. (Russia)
Galina Shevyrdyaeva, Kuban State Univ. (Russia)
Konstantin Mitin, FSUE SPA Astrophysica (Russia)
Alexander Seryogin, FSUE SPA Astrophysica (Russia)
Valentin Petrov, Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy (Germany)
Frank Noack, Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy (Germany)


Published in SPIE Proceedings Vol. 6875:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII
Peter E. Powers, Editor(s)

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