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Nonlinear Change in Refractive Index and Transmission Coefficient of ZnSe:Fe<sup>2+</sup> at Long-Pulse 2.94-μm Excitationстатья
- Авторы: Kir’yanov Alexander V., Il’ichev Nikolai N., Gulyamova Elmira S., Nasibov Alexander S., Shapkin Peter V.
- Журнал: Optics and Photonics Journal
- Том: 5
- Номер: 01
- Год издания: 2015
- Первая страница: 15
- Последняя страница: 27
- DOI: 10.4236/opj.2015.51003
- Аннотация: 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.
- Добавил в систему: Кирьянов Александр Викторович