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A tunable cavity-locked diode laser source for terahertz photomixing

Matsuura, Shuji and Chen, Pin and Blake, Geoffrey A. and Pearson, John C. and Pickett, Herbert M. (2000) A tunable cavity-locked diode laser source for terahertz photomixing. IEEE Transactions on Microwave Theory and Techniques, 48 (3). pp. 380-387. ISSN 0018-9480.

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An all solid-state approach to the precise frequency synthesis and control of widely tunable terahertz radiation by differencing continuous-wave diode lasers at 850 nm is reported in this paper. The difference frequency is synthesized by three fiber-coupled external-cavity laser diodes. Two of the lasers are Pound-Drever-Hall locked to different orders of a Fabry-Perot (FP) cavity, and the third is offset-frequency locked to the second of the cavity-locked lasers using a tunable microwave oscillator. The first cavity-locked laser and the offset-locked laser produce the difference frequency, whose value is accurately determined by the sum of an integer multiple of the free spectral range of the FP cavity and the offset frequency. The dual-frequency 850-nm output of the three laser system is amplified to 500 mW through two-frequency injection seeding of a single semiconductor tapered optical amplifier. As proof of precision frequency synthesis and control of tunability, the difference frequency is converted into a terahertz wave by optical-heterodyne photomixing in low-temperature-grown GaAs and used for the spectroscopy of simple molecules. The 3-dB spectral power bandwidth of the terahertz radiation is routinely observed to be ≾1 MHz. A simple, but highly accurate, method of obtaining an absolute frequency calibration is proposed and an absolute calibration of 10^(-7) demonstrated using the known frequencies of carbon monoxide lines between 0.23-1.27 THz.

Item Type:Article
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Matsuura, Shuji0000-0002-5698-9634
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2000 IEEE. Manuscript received September 29, 1998; revised December 10, 1999. This work was supported by the National Aeronautics and Space Administration under a contract. The work of G. A. Blake was supported by the National Aeronautics and Space Administration, and by the National Science Foundation. The authors would like to thank S. Verghese and K. A. McIntosh, MIT Lincoln Laboratory, Cambridge, for preparing the LTG–GaAs photomixers. The authors also thank T. J. Crawford, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, for his technical support. Portions of this work were performed at the Jet Propulsion Laboratory.
Funding AgencyGrant Number
Subject Keywords:calibration; diode lasers; photomixing; source; terahertz waves
Issue or Number:3
Record Number:CaltechAUTHORS:20120913-144928826
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Official Citation:Matsuura, S.; Pin Chen; Blake, G.A.; Pearson, J.C.; Pickett, H.M.; , "A tunable cavity-locked diode laser source for terahertz photomixing," Microwave Theory and Techniques, IEEE Transactions on , vol.48, no.3, pp.380-387, Mar 2000 doi: 10.1109/22.826836 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34074
Deposited By: Tony Diaz
Deposited On:13 Sep 2012 22:08
Last Modified:09 Mar 2020 13:19

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