Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Pulsed infrared laser photothermal spectrophotometry in gas phase chemical analysis

Not Accessible

Your library or personal account may give you access

Abstract

In this work, a pulsed IR laser is used to excite photothermal deflection signals in gas phase analytes. Characteristics of the lasers, the optical apparatus, and the data processing procedures are analyzed in terms of sensitivities and ultimate precision. Most pulsed lasers have poor longitudinal and transverse mode stability and pointing noise characteristics. Both mode instability and pointing noise result in a spatial intensity distribution at the sample which is not reproduced on a pulse-by-pulse basis.1 Since the refractive-index profile in the sample is related to the intensity profile of the excitation laser, these instabilities can introduce significant errors into the signal. The experimental optimization procedures and data processing methods presented can effectively reduce errors due to pulsed laser mode variations and increase the precision of the measurement by rejection of data obtained from different excitation intensity distributions while modeling the energy response with nonlinear functions. The optical arrangement for these experiments is similar to those described previously.2

© 1986 Optical Society of America

PDF Article
More Like This
Applications of laser pulse shaping to state-selective excitation and measurement of gas phase collisional dynamics

M. A. BANASH, J. BATES, L. HUCKABEE, and W. S. WARREN
FFF3 International Quantum Electronics Conference (IQEC) 1986

Self-pulsing and chaos of optically pumped gas lasers

C. O. WEISS
MEE4 International Quantum Electronics Conference (IQEC) 1986

Photothermal deflection velocimetry in laminar and turbulent ethylene flows using a transient grating

Cameron J. Dasch and Jeffrey A. Sell
TUE8 International Laser Science Conference (ILS) 1986

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved