Opt Express. 2009 Apr 27;17(9):7525-32. doi: 10.1364/oe.17.007525.

Frequency stabilization of a single mode terahertz quantum cascade laser to the kilohertz level.

Optics express

Andriy A Danylov, Thomas M Goyette, Jerry Waldman, Michael J Coulombe, Andrew J Gatesman, Robert H Giles, William D Goodhue, Xifeng Qian, William E Nixon

PMID: 19399130 DOI: 10.1364/oe.17.007525

Abstract

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.

MeSH terms

• Computer-Aided Design
• Equipment Design
• Equipment Failure Analysis
• Feedback
• Lasers, Semiconductor*
• Reproducibility of Results
• Sensitivity and Specificity
• Terahertz Radiation

Publication Types

• Journal Article
• Research Support, U.S. Gov't, Non-P.H.S.