Abstract

We report what we believe to be the first demonstration of an all-semiconductor room-temperature terahertz time domain spectrometer. An optical Stark mode-locked vertical-external-cavity surface-emitting laser with 480fs pulses at 1044nm was used to illuminate low-temperature-grown photoconductive antennae with 5μm-gap bow-tie-shaped electrodes. The coherently detected spectrum has a bandwidth close to 1THz, in which water absorption lines at 0.555 and 0.751THz can be resolved.

© 2008 Optical Society of America

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