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.

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

TREDICUCCI, ALESSANDRO;
2010

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.
Richter, H.; Pavlov, S. G.; Semenov, A. D.; Mahler, L.; Tredicucci, Alessandro; Beere, H. E.; Ritchie, D. A.; Hubers, H. W.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/495141
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