Polarization dependence of two-photon absorption in an AlGaAs waveguide autocorrelator

Karkhanehchi, M. M., Marsh, J. H. and Hutchings, D. C. (1997) Polarization dependence of two-photon absorption in an AlGaAs waveguide autocorrelator. Applied Optics, 36(30), pp. 7799-7801. (doi: 10.1364/AO.36.007799)

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We have obtained the complete polarization dependence of the two-photon absorption coefficient β by measuring the orientational dependence and the contrast ratio of the photocurrent in an Al0.2 Ga0.8 As waveguide autocorrelator at an optical frequency far above the half-bandgap. The measured polarization dependence is consistent with theory and previous picosecond nonlinear transmission experiments. The cubic symmetry of the nonlinearity provides a contrast ratio that exceeds 2, which is larger than would be obtained assuming an isotropic medium and Kleinmann symmetry. This device was used to obtain an autocorrelation of a mode-locked Nd:YLF laser.

Item Type:Articles
Additional Information:M. M. Karkhanehchi acknowledges support from the Ministry of Culture and Higher Education of the Islamic Republic of Iran. This research was supported by the U.K. Ministry of Defence and the Engineering and Physical Sciences Research Council.
Glasgow Author(s) Enlighten ID:Marsh, Professor John and Hutchings, Professor David
Authors: Karkhanehchi, M. M., Marsh, J. H., and Hutchings, D. C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Optics
Publisher:Optical Society of America
ISSN (Online):2155-3165

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