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Proceedings Paper

Two-frequency MOPA diode laser system for difference-frequency generation of coherent THz waves
Author(s): Shuji Matsuura; Pin Chen; Geoffrey A. Blake; John C. Pearson; Herbert M. Pickett
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Paper Abstract

We developed a tunable, cavity-locked diode laser source at 850 nm for difference-frequency generation of coherent THz- waves. The difference frequency is synthesized by three fiber-coupled external-cavity diode lasers, where tow of the lasers are locked to adjacent modes of an ultra-stable Fabry-Perot cavity and the third laser is offset-phase- locked to the second cavity-locked laser using a tunable microwave oscillator. The first cavity-locked laser and the offset-locked laser produces the difference frequency, whose value is precisely determined by sum of integer multiple of free spectral range of the Fabry-Perot cavity and the offset frequency. The difference-frequency signal is amplified to 500 mW by the master oscillator power amplifier technique, simultaneous two-frequency injection-seeding with a single semiconductor optical amplifier. Here we demonstrate the difference-frequency generation of THz waves with the low- temperature-grown GaAs photomixers and its application to high-resolution spectroscopy of simple molecules. An absolute frequency calibration was carried out with an accuracy of approximately 10-7 using CO lines in the THz region.

Paper Details

Date Published: 29 April 1999
PDF: 8 pages
Proc. SPIE 3617, Terahertz Spectroscopy and Applications, (29 April 1999); doi: 10.1117/12.347126
Show Author Affiliations
Shuji Matsuura, California Institute of Technology (Japan)
Pin Chen, California Institute of Technology (United States)
Geoffrey A. Blake, California Institute of Technology (United States)
John C. Pearson, Jet Propulsion Lab. (United States)
Herbert M. Pickett, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 3617:
Terahertz Spectroscopy and Applications
Mark S. Sherwin, Editor(s)

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