Lamb-dip-locked quantum cascade laser for comb-referenced IR absolute frequency measurements

Opt Express. 2008 Jul 21;16(15):11637-46. doi: 10.1364/oe.16.011637.

Abstract

The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 microm has been long-term stabilized to the Lamb-dip center of a CO2 ro-vibrational transition by means of first-derivative locking to the saturated absorption signal. Thanks to the non-linear sum-frequency generation (SFG) process with a fiber-amplified Nd:YAG laser, the QCL mid-infrared (IR) radiation has been linked to an optical frequency-comb synthesizer (OFCS) and its absolute frequency counted with a kHz-level precision and an overall uncertainty of 75 kHz.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Computer Simulation
  • Computer-Aided Design*
  • Equipment Design
  • Equipment Failure Analysis
  • Infrared Rays
  • Lasers*
  • Light
  • Models, Theoretical*
  • Scattering, Radiation
  • Signal Processing, Computer-Assisted / instrumentation*