Multi-species gas detection with long-wavelength VCSEL

Alexandre Lytkine; Wolfgang Jaeger; John Tulip

doi:10.1117/12.570059

20 December 2004 Multi-species gas detection with long-wavelength VCSEL

Alexandre Lytkine, Wolfgang Jaeger, John Tulip

Proceedings Volume 5594, Physics and Applications of Optoelectronic Devices; (2004) https://doi.org/10.1117/12.570059
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

A long-wavelength VCSEL has been used for the first time for multi-species gas detection and for trace gas sensing. The VCSEL with a buried tunnel junction (VERTILAS, Germany) was capable of covering a spectral range of 7 nm or 28 cm^-1 (central wavelength at 1576.3 nm) with the laser temperature and injection current varied between 0-50 °C and 0.5-5 mA respectively. The pressure of CO:CO₂=3:2 gas mixtures buffered with N₂ (N₂ content 0 - 90 %) was varied from 1 mBar up to 1 Bar. To avoid a non-linear dynamic tuning, the combination of a direct injection current with a saw-tooth waveform was used to sweep the laser frequency across absorption lines. A LabVIEW-based computer code was developed for multi-species gas analysis in time domain. Absorption spectra were averaged over 10²-10³ laser scans. It has been shown that a cross interference from all collisional partners should be taken into account for accurate multi-component gas detection. A concentration of 600 ppm of CO₂ in atmospheric air (fractional absorption ~ 10^-4) was detected with laser output power of 120 uW. Long-wavelength VCSELs can be used both for multi-species gas detection in a wide range of pressures and for trace gas monitoring.

Citation Download Citation

Alexandre Lytkine, Wolfgang Jaeger, and John Tulip "Multi-species gas detection with long-wavelength VCSEL", Proc. SPIE 5594, Physics and Applications of Optoelectronic Devices, (20 December 2004); https://doi.org/10.1117/12.570059

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available