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.
|Autori:||Richter H.; Pavlov S. G.; Semenov A. D.; Mahler L.; Tredicucci A.; Beere H. E.; Ritchie D. A.; Hubers H.-W.|
|Titolo:||Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line|
|Anno del prodotto:||2010|
|Digital Object Identifier (DOI):||10.1063/1.3324703|
|Appare nelle tipologie:||1.1 Articolo in rivista|