Nonlinear Optical Absorption in GaSe upon Laser Excitation

The nonlinear absorption in GaSe crystals at high optical excitation levels is experimentally studied. A Nd:YAG laser (first and second harmonics, 1064 and 532 nm) and a liquid laser (tuning range 594–643 nm) were used as excitation sources. It is shown that the features observed in the exciton reso...

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Bibliographic Details
Published in:	Optics and spectroscopy Vol. 128; no. 4; pp. 501 - 504
Main Authors:	Salmanov, V. M., Guseinov, A. G., Mamedov, R. M., Salmanova, A. A., Dashdamirova, N. D.
Format:	Journal Article
Language:	English
Published:	Moscow Pleiades Publishing 01-04-2020 Springer Nature B.V
Subjects:	Absorption Excitation Excitons Gallium selenides Lasers Liquid lasers Neodymium lasers Nonlinear Optics Optical Devices Optics Photoconductivity Photonics Physics Physics and Astronomy Semiconductor lasers YAG lasers photoconductivity luminescence nonlinear absorption GaSe
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Summary:	The nonlinear absorption in GaSe crystals at high optical excitation levels is experimentally studied. A Nd:YAG laser (first and second harmonics, 1064 and 532 nm) and a liquid laser (tuning range 594–643 nm) were used as excitation sources. It is shown that the features observed in the exciton resonance region of the absorption, luminescence, and photoconductivity spectra of GaSe crystals at high optical excitation levels can be explained by exciton–exciton interaction and Coulomb interaction screening by free carriers.
ISSN:	0030-400X 1562-6911
DOI:	10.1134/S0030400X20040189