Temperature variation in the process of terahertz wave generation by intense laser pulsesстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2019 г.
Аннотация:To reach satisfactory energy efficiency of the op-tical-to-terahertz frequency conversion, femtosecond and nanosecond pulsed periodic laser sources in optical and IR range with high peak power are used. This considerably affects the lattice temperature in the interaction area and can lead to the dramatic decrease in conversion efficiency. Nevertheless, the calculations done during the devel-opment of a conversion method are often based on the parameters of the non-linear medium taken without an account for its heating up by focused laser radiation. This can result in unpredicted effects. We have developed a method for the account for non-linear medium heating based on first-principle analytical study of thermo-optical processes which take place in nonlinear-optical crystal structures under periodic femtosecond or nanosecond pumping. The developed approach will allow the exper-imentalists evaluate the temperature and thermo-optical anomalies just inside a pumped volume in every particular case.