Оптимизация спектральных и геометрических параметров параметрического генератора света среднего ИК-диапазона

Abstract

The results of computational and experimental studies of the parameters of a parametric light generator in the mid-IR range are presented. One of the main problems of OPO in the near and mid-IR range (1-8 μm) is the high divergence of the output radiation. The purpose of this study is to improve the spectral and amplitude-spatial characteristics for the out-of-cavity scheme of the IR-OPO ring resona-tor. In an in vitro experiment simulating the radiation of an IR parametric laser, the dependences of the spectral width and quality factor of the radiation of a tunable laser frequency on the wavelength were obtained. It is shown that the improved optical-geometrical parameters of the out-of-zone OPO scheme made it possible to achieve high values of the spectral radiation width (≤ 1 cm-1) and quality factor (≥ 4.106). It is shown that such a developed scheme of an out-of-cavity OPO based on new chalcogenide crystals will expand its application in the mid- and far-IR ranges.