On-chip, self-detected terahertz dual-comb source

Journal Article · Mon Apr 25 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4948358· OSTI ID:22590669

Rösch, Markus; Scalari, Giacomo; Villares, Gustavo; Bosco, Lorenzo; Beck, Mattias; Faist, Jérôme ^[1]

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1. ETH Zurich, Institute of Quantum Electronics, Auguste-Piccard-Hof 1, Zurich 8093 (Switzerland)

We present a directly generated on-chip dual-comb source at terahertz (THz) frequencies. The multi-heterodyne beating signal of two free-running THz quantum cascade laser frequency combs is measured electrically using one of the combs as a detector, fully exploiting the unique characteristics of quantum cascade active regions. Up to 30 modes can be detected corresponding to a spectral bandwidth of 630 GHz, being the available bandwidth of the dual comb configuration. The multi-heterodyne signal is used to investigate the equidistance of the comb modes showing an accuracy of 10{sup −12} at the carrier frequency of 2.5 THz.

• OSTI ID: 22590669
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 17 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCURACY
CARRIERS
CONFIGURATION
GHZ RANGE
LASERS
SIGNALS