Effect of pump-induced loss on the spectral dependence of Rhodamine 6G laser efficiency under microsecond coherent pumping
| Autor: | V. V. Tarkovsky, Slavomir Anufrik, V. Yu Kurstak |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Dye laser
Materials science Active laser medium Physics::Optics Statistical and Nonlinear Physics Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Rhodamine 6G Wavelength Microsecond chemistry.chemical_compound chemistry law Electrical and Electronic Engineering Atomic physics Absorption (electromagnetic radiation) Power density |
| Zdroj: | Quantum Electronics. 51:525-532 |
| ISSN: | 1468-4799 1063-7818 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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