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Two-photon absorption based photodetection at 1550 nm is shown using a GaAs multiple-quantum well waveguide laser structure. A large efficiency is determined and we demonstrate its application for autocorrelation of 100 fs pulses with sub-watt peak powers.
The nonlinear interaction of intense few-cycle terahertz pulses with free carriers in semiconductors is studied in both n-doped and photoexcited systems. Intervalley scattering is found to cause ultrafast modulation and bleaching of the terahertz absorption.
We have performed open-aperture Z-scan measurements on n-doped InGaAs using intense few-cycle terahertz pulses. We observe a significant bleaching of the terahertz pulse absorption attributed to terahertz-electric-field-induced intervalley carrier scattering.
We report wavelength conversion of ultra-low power CW light in integrated silica glass micro-ring resonators via four-wave-mixing in the C-band, as well as strong self-phase modulation of < 100 W peak power optical pulses in a 45 cm waveguide.
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