Frequency stabilization of a single mode terahertz quantum cascade laser to the kilohertz level.
A simple analog locking circuit was shown to stabilize the beat signal between a 2.408 THz quantum cascade laser and a CH(2)DOH THz CO(2) optically pumped molecular laser to 3-4 kHz (FWHM). This is approximately a tenth of the observed long-term (t approximately sec) linewidth of the optically pumped laser showing that the feedback loop corrects for much of the mechanical and acoustic-induced frequency jitter of the gas laser. The achieved stability should be sufficient to enable the use of THz quantum cascade lasers as transmitters in short-range coherent transceivers.
Danylov
Andriy A
AA
Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA. Andriy_Danylov@student.uml.edu
Goyette
Thomas M
TM
Waldman
Jerry
J
Coulombe
Michael J
MJ
Gatesman
Andrew J
AJ
Giles
Robert H
RH
Goodhue
William D
WD
Qian
Xifeng
X
Nixon
William E
WE
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D054023:Lasers, Semiconductor; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation