Frequency stabilization of a terahertz quantum-cascade laser to the Lamb dip of a molecular absorption line
Journal article, 2023

We demonstrate the frequency stabilization of a terahertz quantum-cascade laser (QCL) to the Lamb dip of the absorption line of a D2O rotational transition at 3.3809309 THz. To assess the quality of the frequency stabilization, a Schottky diode harmonic mixer is used to generate a downconverted QCL signal by mixing the laser emission with a multiplied microwave reference signal. This downconverted signal is directly measured by a spectrum analyzer showing a full width at half maximum of 350 kHz, which is eventually limited by high-frequency noise beyond the bandwidth of the stabilization loop.
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Published in

Optics Express

1094-4087 (ISSN) 10944087 (eISSN)

Vol. 31 Issue 9 p. 13888-13894

Research Project(s)

THz metrology for modern wireless systems

Swedish Foundation for Strategic Research (SSF) (FID17-0040), -- .

Categorizing

Areas of Advance

Information and Communication Technology

Infrastructure

Kollberg Laboratory

Myfab (incl. Nanofabrication Laboratory)

Subject Categories (SSIF 2011)

Electrical Engineering, Electronic Engineering, Information Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

Identifiers

DOI

10.1364/OE.483883

PubMed

37157264

More information

Latest update

2/27/2025