Frequency noise and phase-locking of a quantum cascade laser-pumped, 1.073THz molecular laser using a 1560nm frequency comb

S Barbieri,J Hesler,J-F Lampin,W Hansel,A Pagies,R Holzwarth,G Santarelli

doi:10.1109/irmmw-thz.2019.8874581

Frequency noise and phase-locking of a quantum cascade laser-pumped, 1.073THz molecular laser using a 1560nm frequency comb

S Barbieri, J Hesler + Show 5 more

https://doi.org/10.1109/irmmw-thz.2019.8874581

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Publication Date: Sep 1, 2019

Citations: 4

Affiliation: University of Lille, French National Centre for Scientific Research, Institute of Electronics, Microelectronics and Nanotechnology, Virginia Diodes (United States), Menlo Systems (Germany), University of Bordeaux

#Frequency Noise Power Spectral Density #Molecular Laser + Show 8 more

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Abstract

We report the measurement of the frequency noise power spectral density (PSD) of a THz molecular laser (ML) pumped by a mid-infrared (MIR) quantum cascade laser (QCL). This is obtained by beating the ML frequency with the harmonic of the repetition rate of a 1560nm frequency comb (FC). We find a frequency noise PSD <; 10Hz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> /Hz (-95dBc/Hz) at 100kHz from the carrier, limited by the noise of the QCL current driver. We also show that it is possible to actively phase-lock the QCLpumped ML to the FC repetition rate harmonic by controlling the QCL drive current.

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