Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 60,
  • Issue 11,
  • pp. 1217-1240
  • (2006)

Absorption Spectrometry by Narrowband Light in Optically Saturated and Optically Pumped Collision and Doppler Broadened Gaseous Media Under Arbitrary Optical Thickness Conditions

Not Accessible

Your library or personal account may give you access

Abstract

This work examines absorption spectrometry by narrowband light in gaseous media with arbitrary optical thickness when the light induces optical saturation or optical pumping. Two quantities are defined: the observed absorbance, <i>A</i><sub>obs</sub>, and the true absorbance, <i>A</i><sub>true</sub>. The former is the absorbance that is measured under the existing conditions, whereas the latter represents the absorbance one would measure if the light acted solely as a probe of the populations of the various levels, and it is therefore directly proportional to the concentration or density of absorbers. A general integral equation for the propagation of light in media of arbitrary optical thickness in which the light influences the populations of the levels involved is derived. This expression is transcendental in the observed absorbance and cannot be solved analytically. It is shown that an analytical expression can be derived by investigating the inverse relationship, i.e., <i>A</i><sub>true</sub> = <i>f</i>(<i>A</i><sub>obs</sub>). Inasmuch as collision and Doppler broadened media react differently to optical saturation, they are considered separately. It is shown that a nonlinear response results if the medium is optically saturated (or pumped) and not optically thin. Expressions for the error introduced if the technique of standard additions is uncritically applied to such a system are derived.

PDF Article
More Like This
Doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry signals from optically saturated transitions under low pressure conditions

Aleksandra Foltynowicz, Weiguang Ma, Florian M. Schmidt, and Ove Axner
J. Opt. Soc. Am. B 25(7) 1156-1165 (2008)

Selective optical pumping process in Doppler-broadened atoms

Shuangqiang Liu, Yundong Zhang, Daikun Fan, Hao Wu, and Ping Yuan
Appl. Opt. 50(11) 1620-1624 (2011)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


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