Absorption spectra and nonlinear transmission (at λ = 2940 nm) of a diffusion-doped Fe2+:ZnSe single crystal
| Autor: | G. A. Bufetova, E. S. Gulyamova, P V Shapkin, Pavel P Pashinin, N. N. Il’ichev, A S Nasibov |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Absorption spectroscopy Dopant business.industry Doping Analytical chemistry Statistical and Nonlinear Physics Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Wavelength Optics Absorption band Electrical and Electronic Engineering business Absorption (electromagnetic radiation) Single crystal |
| Zdroj: | Quantum Electronics. 45:521-526 |
| ISSN: | 1468-4799 1063-7818 |
| DOI: | 10.1070/qe2015v045n06abeh015687 |
| Popis: | Transmission spectra of a ZnSe sample diffusion-doped with Fe2+ ions have been measured in the wavelength range 500 – 7000 nm. A broad absorption band in the range 500 – 1500 nm has been observed in both doped and undoped regions of the sample. This band is possibly due to deviations from stoichiometry in the course of diffusion doping. The transmission of the Fe2+:ZnSe sample at a wavelength of 2940 nm has been measured at various dopant concentrations and high peak pulse intensities (up to 8 MW cm-2). The samples have been shown to be incompletely bleached: during a laser pulse, the transmission first increases, reaches a maximum, and then falls off. Our results suggest that the incomplete bleaching cannot be accounted for by excited-state absorption. The incomplete bleaching (as well as the transmission maximum) is due to the heating of the sample, which leads to a reduction in upper level lifetime and, accordingly, to an increase in absorption saturation intensity. |
| Databáze: | OpenAIRE |
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