Optics and Photonics Journal

Volume 5, Issue 1 (January 2015)

ISSN Print: 2160-8881   ISSN Online: 2160-889X

Google-based Impact Factor: 0.85  Citations  

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

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DOI: 10.4236/opj.2015.51003    3,522 Downloads   4,708 Views  Citations

ABSTRACT

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.

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Kir’yanov, A. , Il’ichev, N. , Gulyamova, E. , Nasibov, A. and Shapkin, P. (2015) Nonlinear Change in Refractive Index and Transmission Coefficient of ZnSe:Fe2+ at Long-Pulse 2.94-μm Excitation. Optics and Photonics Journal, 5, 15-27. doi: 10.4236/opj.2015.51003.

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