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Tunable diode laser trace gas detection with a vertical cavity surface emitting laser Open Access


Other title
tunable diode laser absorption spectroscopy, TDLAS, BTJ-VCSEL, VCSEL, feedback operation, second harmonic wavelength modulation spectroscopy, WMS
Type of item
Degree grantor
University of Alberta
Author or creator
Vujanic, Dragan
Supervisor and department
Tulip, John (Electrical and Computer Engineering)
Examining committee member and department
Tsui, Ying (Electrical and Computer Engineering)
Jaeger, Wolfgang (Chemistry Centre)
Electrical and Computer Engineering

Date accepted
Graduation date
Master of Science
Degree level
The nature of work conducted during the course of study towards a MSc degree focused on tunable diode laser absorption spectroscopy (TDLAS). This field involves the in-situ detection of gas constituents from low concentration samples. Specifically, I will focus on TDLAS systems utilizing practical optics, readymade electronics, and commercially available near infrared vertical cavity surface emitting lasers (VCSEL). In attempting to lower the minimum detectable concentrations of constituent gases, quantifying contributory noise sources is vital. Consequently, I seek to characterize principle noise sources of a prototypical TDLAS system in order to gain understanding of the limits that inhibit detection of trace gas concentrations. The noise sources which were focused on can be categorized as follows: source laser noise, optical noise, and detection noise. Through this work it was my goal to provide the means of achieving superior sensitivities.
License granted by Dragan Vujanic ( on 2009-09-24T17:16:03Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: 1. INTRODUCTION
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