August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【113】Phase locking of two free running Quantum Cascade Laser frequency combs

Aug 31, 2021, 5:00 PM
Room A

Room A

Talk Condensed Matter Physics (KOND) Condensed Matter Physics


Sandro Dal Cin (TU Wien)


Dual comb spectroscopy using Quantum Cascade Laser (QCL) frequency combs, is a widely applied technique for identification of optical absorption features in the radio-frequency (RF) domain. Temperature fluctuations and electronic noise lead to often highly unstable heterodyne beating signals, hindering reproducible evaluation and analysis. We present a simple, yet reliable phase locking technique based on a dual feedback Optical Phase Locked Loop (OPLL), enabling locking bandwidths above 600 kHz for a heterodyne QCL frequency comb setup. A simplified theoretical model is applied to estimate the required parameters for the loop filters relying on a single measurement of the frequency modulation sensitivity of one frequency comb.

Primary author

Sandro Dal Cin (TU Wien)


Johannes Hillbrand (ETH Zürich) Gottfried Strasser (TU Wien) Benedikt Schwarz (TU Wien)

Presentation materials

There are no materials yet.