Frequency stabilization of a quantum cascade laser by weak resonant feedback from a Fabry-Perot cavity

Data from peer-reviewed publication: G. Zhao et al., Frequency stabilization of a quantum cascade laser by weak resonant feedback from a Fabry-Perot cavity, Optics Letters. Frequency-stabilized mid-infrared lasers are valuable tools for precision molecular spectroscopy. However, their implementation remains limited by complicated stabilization schemes. Here we achieve optical self-locking of a quantum cascade laser to the resonant leak-out field of a highly mode-matched two-mirror cavity. The result is a simple approach to achieving ultra-pure frequencies from high-powered mid-infrared lasers. For short time scales (<0.1 ms), we report a linewidth reduction factor of 3×10^(-6) to a linewidth of 12 Hz. Furthermore, we demonstrate two-photon cavity-enhanced absorption spectroscopy of an N2O overtone transition near a wavelength of 4.53 um.

[
  "006:55"
]

[
  "en"
]

[
  "006:045"
]

[
  "https://doi.org/10.1364/OL.427083"
]

[
  "Chemistry:Analytical chemistry",
  "Environment:Greenhouse gas measurements",
  "Metrology:Optical, photometry, and laser metrology",
  "Physics:Spectroscopy"
]