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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 12, Iss. 1 — Jan. 1, 1973
  • pp: 72–79

New Thermooptical Measurement Method and a Comparison with Other Methods

Chenming Hu and J. R. Whinnery  »View Author Affiliations


Applied Optics, Vol. 12, Issue 1, pp. 72-79 (1973)
http://dx.doi.org/10.1364/AO.12.000072


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Abstract

A simple and sensitive method of measuring the thermally induced index changes arising from absorption of a laser beam in a low-loss material is described. The sample is placed outside the laser cavity, but at the position of minimum radius of curvature of the wavefront, which is a confocal distance behind the waist. It is estimated that the method is sensitive enough to measure absorption coefficients of the order of 5 × 10−6 cm−1 and it is shown experimentally to have good accuracy on low-loss materials. A detailed comparison of sensitivity and accuracy estimates is given for the various published thermal-lens methods for measuring low absorption coefficients. Although the method is illustrated for the thermal effect, it is applicable to other nonlinear index changes induced by laser beams.

© 1973 Optical Society of America

History
Original Manuscript: May 22, 1972
Published: January 1, 1973

Citation
Chenming Hu and J. R. Whinnery, "New Thermooptical Measurement Method and a Comparison with Other Methods," Appl. Opt. 12, 72-79 (1973)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-12-1-72

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