Open AccessImaging with THz quantum cascade lasers using a Schottky diode mixer
Author(s) -
Stefano Barbieri,
Jesse Alton,
Colin Baker,
Thomas Lo,
Harvey E. Beere,
D. A. Ritchie
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.006497
Subject(s) - terahertz radiation , optics , laser , cascade , materials science , quantum cascade laser , diode , optoelectronics , schottky diode , semiconductor laser theory , physics , chemistry , chromatography
An imaging system in reflection geometry based on a multimode 2.9 THz quantum cascade laser as radiation source is reported. The beating between neighbouring longitudinal modes is detected using a room temperature point-contact Schottky diode as mixing element. We show that the technique can, in principle, give a dynamic range of 60 dB with a time constant of ~ 10 mus.