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Paper detail

Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling

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 degrees/h, limited by the mechanical stability of the apparatus.

preprint2013arXivOpen access
Marco RavaroVishal JagtapGiorgio SantarelliCarlo SirtoriLianhe LiS. P. KhannaEdmund H. LinfieldStefano Barbieri
physics.optics
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Marco RavaroVishal JagtapGiorgio SantarelliCarlo SirtoriLianhe LiS. P. KhannaEdmund H. LinfieldStefano Barbieri

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