NONLINEAR OPTICAL COEFFICIENT ESTIMATION OF GaSe:S CRYSTALS RESPONSIBLE FOR THE INTERACTION OF RADIATION IN THE TELECOMMUNICATION AND TERAHERTZ RANGES
O. N. Shevchenko1,2, V. D. Antsygin1, N. A. Nikolaev1
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: gallium selenide, GaSe, nonlinear optical coefficient, telecommunication range, terahertz range, millimeter waves
Abstract
Currently, GaSe crystals, as a special case of van der Waals materials, are of increased interest to researchers and developers in the field of terahertz optoelectronics and integrated photonics. From the engineering point of view, it is important to have an accurate knowledge of the nonlinear optical coefficient, in particular, at telecommunication wavelengths. Few papers have been devoted to its studying, and the available data differ significantly. In this regard, an independent estimation of the nonlinear optical coefficient deo22 of GaSe1-xSx (where x = 0, 0.03, 0.12, 0.16, and 0.22) responsible for interaction of optical radiation frequencies (including telecommunicational) and terahertz ranges is carried out. Based on the totality of data obtained using electro-optical measurements and predictions based on Miller's rule, it is shown that the value of deo22 for crystals with various doping does not exceed 20 pm/V for near-infrared wavelengths. The resulting value is up to two times smaller than that reported by other authors.
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