Application of Carbon Dioxide Waveguide Lasers to Infrared Saturation Spectroscopy
View / Open Files
Authors
Crocker, David
Date
1977-01Awarding Institution
University of Cambridge
Qualification
PhD
Language
English
Type
Thesis
Metadata
Show full item recordCitation
Crocker, D. (1977). Application of Carbon Dioxide Waveguide Lasers to Infrared Saturation Spectroscopy (doctoral thesis). https://doi.org/10.17863/CAM.78606
Abstract
The development of tunable lasers has made possible spectroscopy at a
resolution previously unattainable. Although continuous-wave broadly
tunable sources in the 10 pm region do not yet exist , waveguide carbon
dioxide lase r s offer a useful tunability about a large number of emission
lines in this part of the spectrum.
The first part of this thesis contains a review ·or waveguide Co2 laser
theory and previous wo r k on these devices. A design intended for high
resolution spectroscopy is then described. Two of these lasers have been
used in a spectrometer , using a saturated fluorescence to provide a stable
and calibrated reference and a microprocessor- based system for control
and monitoring of the tunable source. The general principles are
resolution limits of sub- Doppler saturation spectroscopy are also covered.
The second part is a compendium of measurements taken and insights
gained using the completed spectrometer. Collisional transitions between
the hype fine components of a methyl iodide absorption have been observed .
Precise measurements of phosphine absorption frequencies indicate that
far - infrared lase r s may be pumped much further from resonance than has
been assumed hitherto. Measurements on the allene molecule have provide::
improved constants for the v g= 1 state; the split ting of states by K- or 1-
doubling has also been observed, confirming theoretical predictions.
Finally, a· postulated Coriolis interaction between two modes of formic
acid has been verified and quantified, and improved constants obtained for,
both modes in a study bringing together measurements taken using the
waveguide laser spectrometer and the microwave and submillimetre
measurements of others.
Keywords
tunable, lasers, laser theory
Identifiers
This record's DOI: https://doi.org/10.17863/CAM.78606
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.