Nonlinear Change in Refractive Index and Transmission Coefficient of ZnSe:Fe2+ at Long-Pulse 2.94-μm Excitation

Autor:	Elmira S. Gulyamova, Peter V. Shapkin, Alexander S. Nasibov, Nikolai N Il'ichev, Alexander V. Kir'yanov
Rok vydání:	2015
Předmět:	Nonlinear system Long pulse Optics Materials science business.industry Analytical chemistry Thermal effect Transmission coefficient Z-scan technique business Saturation (magnetic) Refractive index Excitation
Zdroj:	Optics and Photonics Journal. :15-27
ISSN:	2160-889X 2160-8881
Popis:	An experimental study of the nonlinear changes in refractive index and transmission coefficient of single-crystal ZnSe:Fe2+, fabricated through the Fe-diffusion method, at long-pulse (~300 ns), sub-mJ, 2.94-mm Z-scan probing is reported. As well, a theoretical model based on the generalized Avizonis-Grotbeck equations is developed and applied for straightforward fitting of the open- and closed-aperture Z-scans, obtained for ZnSe:Fe2+ with different Fe2+ centers concentrations. The modeling results reveal that the contributions in the absorption and refractive index nonlinearities of ZnSe:Fe2+ are “common” resonant-absorption saturation (the minor part) and pulse-induced heating of the samples (the major part), which are strongly dependent on Fe2+ concentrations. Large values of the index change (>~10-3) and partial resonant-absorption bleaching (limited by ~50%), both produced via the thermal effect mainly, are the features of the ZnSe:Fe2+ samples inherent to this type of excitation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a108ccee8f34de1919a5f5f0f519962f https://doi.org/10.4236/opj.2015.51003 Zobrazit plný text záznamu