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Frequency and Phase-lock Control of a 3 THz Quantum Cascade LaserWe have locked the frequency of a 3 THz quantum cascade laser (QCL) to that of a far-infrared gas laser with a tunable microwave offset frequency. The locked QCL line shape is essentially Gaussian, with linewidths of 65 and 141 kHz at the -3 and -10 dB levels, respectively. The lock condition can be maintained indefinitely, without requiring temperature or bias current regulation of the QCL other than that provided by the lock error signal. The result demonstrates that a terahertz QCL can be frequency controlled with l-part-in-lO(exp 8) accuracy, which is a factor of 100 better than that needed for a local oscillator in a heterodyne receiver for atmospheric and astronomic spectroscopy.
Document ID
20070018767
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Betz, A. L.
(Colorado Univ. Boulder, CO, United States)
Boreiko, R. T.
(Colorado Univ. Boulder, CO, United States)
Williams, B. S.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Kumar, S.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Hu, Q.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Reno, J. L.
(Sandia National Labs. Albuquerque, NM, United States)
Date Acquired
August 23, 2013
Publication Date
July 15, 2005
Publication Information
Publication: Optics Letters
Volume: 30
Issue: 14
Subject Category
Optics
Funding Number(s)
CONTRACT_GRANT: NNG04GC11G
CONTRACT_GRANT: DE-AC04-94AL85000
CONTRACT_GRANT: NAG1-01074
Distribution Limits
Public
Copyright
Other

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