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Two-photon absorption-induced self-phase modulation in GaAs–AlGaAs waveguides for surface-emitted second-harmonic generation

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Abstract

Performance-limiting asymmetric distortion is observed in the spectra of fundamental pulses transmitted through GaAsAl0.9Ga0.1As multilayer waveguides designed for surface-emitted second-harmonic generation. This behavior is attributed to refractive-index changes resulting from the accumulation of free carriers created by two-photon absorption in the GaAs layers. Numerical simulations of the intensity-dependent spectra by use of the separately measured two-photon absorption coefficient are shown to be in good agreement with the observed spectra.

© 1999 Optical Society of America

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