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Spectroscopic applications and frequency locking of THz photomixing with distributed-Bragg-reflector diode lasers in low-temperature-grown GaAs

Chen, Pin and Blake, Geoffrey A. and Gaidas, M. C. and Brown, E. R. and McIntosh, K. A. and Chou, S. Y. and Nathan, M. I. and Williamson, F. (1997) Spectroscopic applications and frequency locking of THz photomixing with distributed-Bragg-reflector diode lasers in low-temperature-grown GaAs. Applied Physics Letters, 71 (12). pp. 1601-1603. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:CHEapl97

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Abstract

A compact, narrow-linewidth, tunable source of THz radiation has been developed for spectroscopy and other high-resolution applications. Distributed-Bragg-reflector (DBR) diode lasers at 850 nm are used to pump a low-temperature-grown GaAs photomixer. Resonant optical feedback is employed to stabilize the center frequencies and narrow the linewidths of the DBR lasers. The heterodyne linewidth full-width at half-maximum of two optically locked DBR lasers is 50 kHz on the 20 ms time scale and 2 MHz over 10 s; free-running DBR lasers have linewidths of 40 and 90 MHz on such time scales. This instrument has been used to obtain rotational spectra of acetonitrile (CH3CN) at 313 GHz. Detection limits of 1 × 10^–4 Hz^1/2 (noise/total power) have been achieved, with the noise floor dominated by the detector's noise equivalent power.


Item Type:Article
Additional Information:©1997 American Institute of Physics. (Received 7 May 1997; accepted 10 July 1997) The authors gratefully acknowledge L. W. Hollberg and S. B. Waltman of the National Institute of Standards and Technology at Boulder, Colorado for their generous assistance on resonant optical feedback.
Subject Keywords:gallium arsenide; III-V semiconductors; distributed Bragg reflector lasers; optical feedback; laser mode locking; semiconductor lasers
Record Number:CaltechAUTHORS:CHEapl97
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:CHEapl97
Alternative URL:http://dx.doi.org/10.1063/1.119845
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2150
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:12 Mar 2006
Last Modified:26 Dec 2012 08:47

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