Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
Optics
2013-04-12 v1
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 degrees/h, limited by the mechanical stability of the apparatus.
Cite
@article{arxiv.1304.3207,
title = {Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling},
author = {Marco Ravaro and Vishal Jagtap and Giorgio Santarelli and Carlo Sirtori and Lianhe Li and S. P. Khanna and Edmund H. Linfield and Stefano Barbieri},
journal= {arXiv preprint arXiv:1304.3207},
year = {2013}
}