Open AccessLaser emission at 4.5 THz from 15NH3 and a mid-infrared quantum-cascade laser as a pump source
Author(s) -
Martin Wienold,
Alsu Zubairova,
HeinzWilhelm Hübers
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.395832
Subject(s) - laser , terahertz radiation , far infrared laser , quantum cascade laser , optics , materials science , laser pumping , optical pumping , spectroscopy , infrared , optoelectronics , cascade , terahertz spectroscopy and technology , gas laser , continuous wave , physics , chemistry , chromatography , quantum mechanics
We present an optically pumped terahertz gas laser, which is based on a mid-infrared quantum-cascade laser as a pump source, a transversely pumped standing wave resonator, and 15 NH 3 as a gain medium. We observe several laser lines around 4.5 THz, corresponding to rotational transitions in the ν 2 band of ammonia. So far, these are the highest frequencies obtained from a QCL-pumped THz gas laser. The involved molecular transitions are unambiguously identified by high-resolution spectroscopy.