By Topic

High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
10 Author(s)
Ren, Y. ; Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands ; Hovenier, J.N. ; Higgins, R. ; Gao, J.R.
more authors

Your organization might have access to this article on the publisher's site. To check, click on this link: 

A frequency tunable terahertz heterodyne spectrometer, based on a third-order distributed feedback quantum cascade laser as a local oscillator, has been demonstrated by measuring molecular spectral lines of methanol (CH3OH) gas at 3.5 THz. By varying the bias voltage of the laser, we achieved a tuning range of ∼1 GHz of the lasing frequency, within which the molecular spectral lines were recorded. The measured spectra show excellent agreement with modeled ones. By fitting we derived the lasing frequency for each bias voltage accurately. The ultimate performance of the receiver including the resolution of noise temperature and frequency is also addressed.

Published in:

Applied Physics Letters  (Volume:98 ,  Issue: 23 )