Phase-locking of a 2.5 THz quantum cascade laser to a frequency comb using a GaAs photomixer

M Ravaro; C Manquest; C Sirtori; S Barbieri; G Santarelli; K Blary; J-F Lampin; S P Khanna; E H Linfield

doi:10.1364/OL.36.003969

Phase-locking of a 2.5 THz quantum cascade laser to a frequency comb using a GaAs photomixer

Opt Lett. 2011 Oct 15;36(20):3969-71. doi: 10.1364/OL.36.003969.

Authors

M Ravaro¹, C Manquest, C Sirtori, S Barbieri, G Santarelli, K Blary, J-F Lampin, S P Khanna, E H Linfield

Affiliation

¹ Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot and CNRS (UMR 7162), Paris, France. marco.ravaro@univ‐paris‐diderot.fr

PMID: 22002355
DOI: 10.1364/OL.36.003969

Abstract

We report the heterodyne detection and phase locking of a 2.5 THz quantum cascade laser (QCL) using a terahertz frequency comb generated in a GaAs photomixer using a femtosecond fiber laser. With 10 mW emitted by the QCL, the phase-locked signal at the intermediate frequency yields 80 dB of signal-to-noise ratio in a bandwidth of 1 Hz.