Share Email Print
cover

Proceedings Paper

Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser
Author(s): Y. J. Han; J. Partington; R. Chhantyal-Pun; E. Nuttall; M. Henry; O. Auriacombe; T. Rawlings; L. H. Li; J. Keeley; M. Oldfield; N. Brewster; R. Dong; P. Dean; A. G. Davies; B. N. Ellison; E. H. Linfield; A. Valavanis
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We present a self-mixing terahertz-frequency gas spectroscopy technique using a multimode quantum cascade laser. A precision-micro-machined external waveguide module and a double-metal quantum cascade laser device are used to increase the optical feedback and the laser’s frequency tuning range. Methanol spectra are obtained using two laser modes at 3.362 THz and 3.428 THz simultaneously, with more than 8 absorption peaks resolved over a 17-GHz bandwidth, which provide minimum detectable absorption coefficients of 2.7×10-4 cm−1 and 4.9×10−4 cm−1, respectively. In contrast to all previous self-mixing spectroscopy, our multimode technique expands the sensing bandwidth significantly. This broadband spectroscopy technique can potentially be used for the identification and analysis of chemical, biological radiological and nuclear (CBRN) agents and explosives.

Paper Details

Date Published: 6 September 2019
PDF: 8 pages
Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 111240Q (6 September 2019);
Show Author Affiliations
Y. J. Han, Univ. of Leeds (United Kingdom)
J. Partington, Univ. of Leeds (United Kingdom)
R. Chhantyal-Pun, Univ. of Leeds (United Kingdom)
E. Nuttall, Univ. of Leeds (United Kingdom)
M. Henry, STFC Rutherford Appleton Lab. (United Kingdom)
O. Auriacombe, STFC Rutherford Appleton Lab. (United Kingdom)
T. Rawlings, STFC Rutherford Appleton Lab. (United Kingdom)
L. H. Li, Univ. of Leeds (United Kingdom)
J. Keeley, Univ. of Leeds (United Kingdom)
M. Oldfield, STFC Rutherford Appleton Lab. (United Kingdom)
N. Brewster, STFC Rutherford Appleton Lab. (United Kingdom)
R. Dong, Univ. of Leeds (United Kingdom)
P. Dean, Univ. of Leeds (United Kingdom)
A. G. Davies, Univ. of Leeds (United Kingdom)
B. N. Ellison, STFC Rutherford Appleton Lab. (United Kingdom)
E. H. Linfield, Univ. of Leeds (United Kingdom)
A. Valavanis, Univ. of Leeds (United Kingdom)


Published in SPIE Proceedings Vol. 11124:
Terahertz Emitters, Receivers, and Applications X
Manijeh Razeghi; Alexei N. Baranov; Miriam S. Vitiello, Editor(s)

© SPIE. Terms of Use
Back to Top
PREMIUM CONTENT
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?
close_icon_gray