We report an integrated all-optical radio frequency spectrum analyzer based on a~ 4cm long
doped silica glass waveguide, with a bandwidth greater than 2.5 THz. We use this device to …

Semiconductor materials which exhibit two-photon absorption characteristic within a spectral
region of interest can be useful in building an ultra-compact interferometric autocorrelator. In …

This paper proposes a displacement measurement system using two-photon absorption
(TPA) process in a Si-avalanche photodiode and fiber Bragg gratings (FBGs). The use of …

We propose a multipoint fiber Bragg grating (FBG) sensing system that measures both
spectral change of FBGs and precise distance to them by using intensity-modulated light …

AlGaAs bulk electro-optic Mach-Zehnder modulators with low V π are reported. Epilayer
design is an npin, which is shown to be equivalent to a pin. Measured V π is 1 V for 1 cm …

We developed a simple and real-time readout autocorrelator for several tens and sub-10fs
pulses, based on the two photon absorption phenomena of a commercial GaP photodetector …

We demonstrate a proof-of-concept saturable absorption based pulsewidth measurement
(SAPM) by exploring the intensity dependent nonlinear transmission (ie, saturable …

We demonstrate experimentally two-photon gain in semiconductor structures, shown
previously only in dilute atomic systems. Two-photon gain is directly observed and …

We recently demonstrated orders of magnitude enhancement of two-photon absorption
(2PA) in direct gap semiconductors due to intermediate state resonance enhancement for …

In this article, we report on an optical real-time autocorrelator readout with a 5 Hz refresh
rate, equipped with a transimpedance amplified photodetector based on the two-photon …