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Collimating optical system of polymethilpentene for quantum cascade terahertz laser
Russian version
Kuritsyn D. I. 1,2, Morozov S. V. 1,2, Gavrilenko L. V. 1, Gavrilenko V. I. 1,2, Dubinov A. A. 1, Rumyantsev V. V. 1, Khabibullin R. A. 3, Sokolovsky G. S. 2
1Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
2Ioffe Institute, St. Petersburg, Russia
3National Research Center “Kurchatov Institute”, Moscow, Russia
Email: dk@ipmras.ru, more@ipmras.ru, aritany@ipmras.ru, gavr@ipmras.ru, sanya@ipmras.ru, rumyantsev@ipmras.ru, khabibullin_r@mail.ru, gs@mail.ioffe.ru
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The results of an experimental study of a collimating optical system for a quantum cascade laser (QCL) with a frequency of ~ 4.1 THz is presented. This system consists of a hyper-spherical lens, which is a semi-spherical lens glued to a spacer plate on the end of the QCL. The lens and spacer were made from polymethylpentene (TPX) - a material with low dispersion over a wide range of wavelengths and transparent in both the visible and THz ranges. The optimal thickness of the spacer was calculated and experimentally determined. An increase in the collected power of the QCL radiation using the hyper-sphere was found to be 14 times. Keywords: quantum cascade laser, THz radiation, collimator.
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