Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
Ravaro, M, Jagtap, V, Santarelli, G et al. (5 more authors)
(2013)
Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling.
Applied Physics Letters, 102 (9).
091107.
ISSN 0003-6951
Abstract
We demonstrate a coherent imaging system based on a terahertz (THz) frequency quantum cascade laser (QCL) phase-locked to a near-infrared fs-laser comb. The phase locking enables coherent electro-optic sampling of the continuous-wave radiation emitted by the QCL through the generation of a heterodyne beat-note signal. We use this beat-note signal to demonstrate raster scan coherent imaging using a QCL emitting at 2.5 THz. At this frequency the detection noise floor of our system is of 3 pW/Hz and the long-term phase stability is <3°/h, limited by the mechanical stability of the apparatus.
Metadata
Item Type:
Article
Authors/Creators:
Ravaro, M
Jagtap, V
Santarelli, G
Sirtori, C
Li, LH
Khanna, SP
Linfield, EH
Barbieri, S
Copyright, Publisher and Additional Information:
(c) 2013, American Institute of Physics. Reproduced in accordance with the publisher's self-archiving policy.
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