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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 21, Iss. 9 — May. 1, 1982
  • pp: 1654–1662

Thermooptic-based differential measurements of weak solute absorptions with an interferometer

David A. Cremers and Richard A. Keller  »View Author Affiliations


Applied Optics, Vol. 21, Issue 9, pp. 1654-1662 (1982)
http://dx.doi.org/10.1364/AO.21.001654


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Abstract

An interferometric method of measuring small differences between weak optical absorptions of solutions has been developed using the thermooptic effect. To record the small changes in optical path length ∼λ/200 due to heating, it was necessary to stabilize the fringe pattern with respect to slow thermal drift using a galvanometer-driven compensator plate controlled by a closed feedback loop. Fringe shifts from background absorptions were nulled out to better than 1 part in 400, permitting the measurement of differences in absorptions between two solutions that were 1/100th of background. Using laser powers of 100 mW, absorptions ∼5 × 10−6 cm−1 (base e) could be measured with CCl4 solutions.

© 1982 Optical Society of America

History
Original Manuscript: September 21, 1981
Published: May 1, 1982

Citation
David A. Cremers and Richard A. Keller, "Thermooptic-based differential measurements of weak solute absorptions with an interferometer," Appl. Opt. 21, 1654-1662 (1982)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-21-9-1654

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