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Approach to optical interference fringes reduction in diode laser absorption spectroscopy

Persson, Linda LU ; Andersson, Fredrik LU ; Andersson, Mats LU and Svanberg, Sune LU (2007) In Applied Physics B 87(3). p.523-530
Abstract
The advantage of a new scheme for balanced detection has been investigated to reduce the influence of optical interference fringes when performing diode laser gas absorption spectroscopy employing lock-in amplifiers and pigtailed lasers. The influence of the fringes has been reduced by comparing the lock-in 2 f signal due to the gas sample with that of a reference beam. The frequency regions outside the absorption feature have been used to obtain information on the interference fringe impact on the signal of interest. We have demonstrated an efficient way to reduce the influence of such fringes by employing this technique combined with non-linear signal processing methods. The different steps of the algorithm are presented. In the... (More)
The advantage of a new scheme for balanced detection has been investigated to reduce the influence of optical interference fringes when performing diode laser gas absorption spectroscopy employing lock-in amplifiers and pigtailed lasers. The influence of the fringes has been reduced by comparing the lock-in 2 f signal due to the gas sample with that of a reference beam. The frequency regions outside the absorption feature have been used to obtain information on the interference fringe impact on the signal of interest. We have demonstrated an efficient way to reduce the influence of such fringes by employing this technique combined with non-linear signal processing methods. The different steps of the algorithm are presented. In the experimental arrangement presented, a reduction of the optical interference fringes by about 10 times is achieved, as demonstrated in measurements on molecular oxygen around 761 nm. The new technique is compared with an analog technique for balanced detection and certain advantages of the computer algorithm are pointed out. In particular, the emerging field of gas spectroscopy in scattering solid media strongly benefits from the technique presented. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
87
issue
3
pages
523 - 530
publisher
Springer
external identifiers
  • wos:000246383800020
  • scopus:34248373825
ISSN
0946-2171
DOI
10.1007/s00340-007-2593-y
language
English
LU publication?
yes
id
42805613-2a13-4d9d-942c-25d4448a4fac (old id 660634)
date added to LUP
2007-12-19 13:13:22
date last changed
2017-07-02 03:34:16
@article{42805613-2a13-4d9d-942c-25d4448a4fac,
  abstract     = {The advantage of a new scheme for balanced detection has been investigated to reduce the influence of optical interference fringes when performing diode laser gas absorption spectroscopy employing lock-in amplifiers and pigtailed lasers. The influence of the fringes has been reduced by comparing the lock-in 2 f signal due to the gas sample with that of a reference beam. The frequency regions outside the absorption feature have been used to obtain information on the interference fringe impact on the signal of interest. We have demonstrated an efficient way to reduce the influence of such fringes by employing this technique combined with non-linear signal processing methods. The different steps of the algorithm are presented. In the experimental arrangement presented, a reduction of the optical interference fringes by about 10 times is achieved, as demonstrated in measurements on molecular oxygen around 761 nm. The new technique is compared with an analog technique for balanced detection and certain advantages of the computer algorithm are pointed out. In particular, the emerging field of gas spectroscopy in scattering solid media strongly benefits from the technique presented.},
  author       = {Persson, Linda and Andersson, Fredrik and Andersson, Mats and Svanberg, Sune},
  issn         = {0946-2171},
  language     = {eng},
  number       = {3},
  pages        = {523--530},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Approach to optical interference fringes reduction in diode laser absorption spectroscopy},
  url          = {http://dx.doi.org/10.1007/s00340-007-2593-y},
  volume       = {87},
  year         = {2007},
}