Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4948358
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Funding
- EU [296500, FP7-ICT-2011-C]
- Swiss National Science Foundation
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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(-12) at the carrier frequency of 2.5 THz. Published by AIP Publishing.
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