skip to main content

Title: Dual-wavelength quantum cascade laser for trace gas spectroscopy

We demonstrate a sequentially operating dual-wavelength quantum cascade laser with electrically separated laser sections, emitting single-mode at 5.25 and 6.25 μm. Based on a single waveguide ridge, this laser represents a considerable asset to optical sensing and trace gas spectroscopy, as it allows probing multiple gas species with spectrally distant absorption features using conventional optical setups without any beam combining optics. The laser capability was demonstrated in simultaneous NO and NO{sub 2} detection, reaching sub-ppb detection limits and selectivity comparable to conventional high-end spectroscopic systems.
Authors:
; ; ;  [1] ; ; ; ;  [2] ;  [3]
  1. Laboratory for Air Pollution and Environmental Technology, Empa, Überlandstrasse 129, 8600 Dübendorf (Switzerland)
  2. Institute for Quantum Electronics, ETH Zürich, Wolfgang-Pauli-Str. 16, 8093 Zürich (Switzerland)
  3. Institute for Aerosol and Sensor Technology, FHNW, Klosterzelgstrasse 2, 5210 Windisch (Switzerland)
Publication Date:
OSTI Identifier:
22350941
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; BEAMS; DETECTION; LASERS; NITRIC OXIDE; NITROGEN DIOXIDE; OPTICS; SENSITIVITY; WAVEGUIDES