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|Title:||Three-photon absorption in ZnO and ZnS crystals||Authors:||He, J.
|Issue Date:||14-Nov-2005||Citation:||He, J., Qu, Y., Li, H., Mi, J., Ji, W. (2005-11-14). Three-photon absorption in ZnO and ZnS crystals. Optics Express 13 (23) : 9235-9247. ScholarBank@NUS Repository. https://doi.org/10.1364/OPEX.13.009235||Abstract:||We report a systematic investigation of both three-photon absorption (3PA) spectra and wavelength dispersions of Kerr-type nonlinear refraction in wide-gap semiconductors. The Z-scan measurements are recorded for both ZnO and ZnS with femtosecond laser pulses. While the wavelength dispersions of the Kerr nonlinearity are in agreement with a two-band model, the wavelength dependences of the 3PA are found to be given by (3Ephoton/Eg-1) 5/2(3Ephoton/Eg)-9. We also evaluate higher-order nonlinear optical effects including the fifth-order instantaneous nonlinear refraction associated with virtual three-photon transitions, and effectively seventh-order nonlinear processes induced by three-photon-excited free charge carriers. These higher-order nonlinear effects are insignificant with laser excitation irradiances up to 40 GW/cm2. Both pump-probe measurements and three-photon figures of merits demonstrate that ZnO and ZnS should be a promising candidate for optical switching applications at telecommunication wavelengths. ©2005 Optical Society of America.||Source Title:||Optics Express||URI:||http://scholarbank.nus.edu.sg/handle/10635/98402||ISSN:||10944087||DOI:||10.1364/OPEX.13.009235|
|Appears in Collections:||Staff Publications|
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