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Two-frequency MOPA diode laser system for difference-frequency generation of coherent THz waves

Matsuura, Shuji and Chen, Pin and Blake, Geoffrey A. and Pearson, J. C. and Pickett, Herbert M. (1999) Two-frequency MOPA diode laser system for difference-frequency generation of coherent THz waves. In: Terahertz Spectroscopy and Applications. Proceedings of SPIE. No.3617. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 14-21. ISBN 9780819430878.

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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.

Item Type:Book Section
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Matsuura, Shuji0000-0002-5698-9634
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 1999 Society of Photo-optical Instrumentation Engineers (SPIE). The authors thank S. Verghese and K. A. McIntosh of MIT Lincoln Laboratory for preparing the LTG-GaAs photomixers. We also thank T. J. Crawford of Jet Propulsion Laboratory for his technical support. Portions of this work performed at the Jet Propulsion Laboratory California Institute of Technology were done under contract with the National Aeronautics and Space Administration (NASA). G. A. Blake acknowledges additional support from NASA and from the National Science Foundation.
Funding AgencyGrant Number
Subject Keywords:terahertz, source, photomixing, diode laser, stabilization, calibration
Series Name:Proceedings of SPIE
Issue or Number:3617
Record Number:CaltechAUTHORS:20181107-160518983
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Official Citation:Shuji Matsuura, Pin Chen, Geoffrey A. Blake, John C. Pearson, Herbert M. Pickett, } "Two-frequency MOPA diode laser system for difference-frequency generation of coherent THz waves", Proc. SPIE 3617, Terahertz Spectroscopy and Applications, (29 April 1999); doi: 10.1117/12.347126;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90733
Deposited By: Tony Diaz
Deposited On:08 Nov 2018 00:44
Last Modified:16 Nov 2021 03:35

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