NDLI: Spectral Properties of THz Quantum-Cascade Lasers: Frequency Noise, Phase-Locking and Absolute Frequency Measurement

Content Provider	Springer Nature Link
Author	Ravaro, Marco Jagtap, Vishal Manquest, Christophe Gellie, Pierre Santarelli, Giorgio Sirtori, Carlo Khanna, Suraj P. Linfield, Edmund H. Barbieri, Stefa
Copyright Year	2013
Abstract	Quantum cascade lasers combine desirable features, namely high optical power and compactness, as no other coherent source in the field of THz generation. While their maximum operating temperature is progressively increasing, getting close to the range accessible by Peltier cooling, their range of application is expanding into new fields, such us molecular spectroscopy and their use as local oscillators. These applications would benefit from the investigation and improvement of the laser coherence properties. In this contribution we report the exploitation of electro-optic coherent detection based on a near-IR frequency comb to measure the frequency noise of a free running 2.5 THz quantum cascade laser. An intrinsic linewidth quantum limit of ~230 Hz has been measured, in good agreement with the Schawlow-Townes theoretical prediction. The same detection scheme is then exploited to phase-lock the quantum cascade laser line to a multiple of the comb tooth spacing, while a second comb allows to precisely measure the THz frequency. Such a dual frequency comb experimental setup thus yields a narrow line THz emission traceable to a microwave frequency standard.
Starting Page	342
Ending Page	356
Page Count	15
File Format	PDF
ISSN	18666892
Journal	International Journal of Infrared and Millimeter Waves
Volume Number	34
Issue Number	5-6
e-ISSN	18666906
Language	English
Publisher	Springer US
Publisher Date	2013-05-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum cascade lasers THz generation THz detection Coherence Frequency metrology Electrical Engineering Electronics and Microelectronics, Instrumentation Optics and Electrodynamics
Content Type	Text
Resource Type	Article
Subject	Instrumentation Condensed Matter Physics Electrical and Electronic Engineering Radiation

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