TITLE

Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line

AUTHOR(S)
Richter, H.; Pavlov, S. G.; Semenov, A. D.; Mahler, L.; Tredicucci, A.; Beere, H. E.; Ritchie, D. A.; Hübers, H.-W.
PUB. DATE
February 2010
SOURCE
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p071112
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The frequency of a terahertz quantum-cascade laser is stabilized to the absorption line of methanol gas at a frequency of 2.55 THz. The method is based on frequency modulation of the laser emission across the absorption line. The resulting derivativelike signal is used as an error signal for a control loop that keeps the laser frequency at maximum absorption. The unstabilized laser that is operated in a pulse tube cooler has frequency fluctuations of 15 MHz, which are reduced to 300 kHz with the control loop in action. The line shape of the locked signal is Gaussian.
ACCESSION #
48199487

 

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