Transmission of intense electromagnetic radiation through crystals in the region of exciton absorption

A. F. Lubchenko

V. L. Vinetskiĭ, Tamara A. Kudykina

В. М. Салманов, A. G. Huseynov, Rovnag Rzayev +3 more

In this study, we experimentally study the dependence of the intensity of laser radiation incident on and transmitted through a layered InSe crystal. A picosecond YAG:Nd3+ laser with a parametric light generator was used as a light source, making it possible to generate light pulses with a duration of [Formula: see text]30 ps, tunable in frequency within the range of 0.75–1.5 μm. Optical bistability in the region of exciton resonance was detected in an InSe crystal at room-temperature under the picosecond YAG:Nd laser. It is shown that the decrease in absorption in the exciton resonance region is associated with the process of exciton–exciton interaction, shielding of excitons, and the Mott transition.

J. J. Hopfield

V. Musinschi, Mihail Caraman, Vladimir A. Lichman +3 more

By means of two-beam experiments, the transmission properties of highly excited GaSe crystal of different thicknesses (2 micrometers to 1.5 mm) have been investigated in the fundamental absorption and free exciton region. Induced transmission was observed in the whole considered region for lower pump intensities. Results of bistability in an entire ZnTe thin films are present for the first time.

John J. Sein