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This article is cited in 2 scientific papers (total in 2 papers)
Control of laser radiation parameters
Effect of pump-induced loss on the spectral dependence of Rhodamine 6G laser efficiency under microsecond coherent pumping
V. V. Tarkovsky, S. S. Anufrik, V. Yu. Kurstak Yanka Kupala State University of Grodno
Abstract:
We examine the effect of the pump-induced loss in the gain medium of a Rhodamine 6G laser on the spectral dependence of the laser efficiency under microsecond coherent pumping. It is shown theoretically and experimentally that the pump-induced loss is mainly due to nonlinear refraction and thermo-optic inhomogeneities of the gain medium, which produce a negative thermal lens, whose defocusing effect reduces the laser efficiency. The induced absorption by excited-state singlet and triplet levels of dye molecules is shown to make no significant contribution to changes in laser efficiency. The pump-induced thermal loss at the peak absorption wavelength of Rhodamine 6G plays a more important role well above the threshold pump power density (γ ≥ 5). We demonstrate that the maximum dye laser efficiency under microsecond coherent pumping can only be achieved at an optimal pump wavelength.
Keywords:
laser, dye, Rhodamine 6G, spectral laser efficiency, microsecond coherent pumping, absorption by singlet and triplet levels, nonlinear refraction, thermal inhomogeneities, negative thermal lens.
Received: 04.09.2020 Revised: 05.03.2021
Citation:
V. V. Tarkovsky, S. S. Anufrik, V. Yu. Kurstak, “Effect of pump-induced loss on the spectral dependence of Rhodamine 6G laser efficiency under microsecond coherent pumping”, Kvantovaya Elektronika, 51:6 (2021), 525–532 [Quantum Electron., 51:6 (2021), 525–532]
Linking options:
https://www.mathnet.ru/eng/qe17452 https://www.mathnet.ru/eng/qe/v51/i6/p525
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