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Applied Optics

Applied Optics


  • Vol. 39, Iss. 16 — Jun. 1, 2000
  • pp: 2733–2736

Measurement of refractive-index change at a liquid–solid interface close to the critical angle

Marcelo Martinelli, Marcos Gugliotti, and Ricardo Josué Horowicz  »View Author Affiliations

Applied Optics, Vol. 39, Issue 16, pp. 2733-2736 (2000)

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We measured the refractive-index change on a liquid sample, using the reflection of a polarized Gaussian laser beam close to the angle of total reflection. We applied this technique to a solution of nickel (ii) phthalocyanine tetrasulfonated (NiPTS) in water–ethanol (1/1 v/v), in which the nonlinearity of the refractive index is due to optically induced thermal effects. We show that close to the angle of total reflection the sensitivity of this technique is four times bigger than at normal incidence.

© 2000 Optical Society of America

OCIS Codes
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(350.6830) Other areas of optics : Thermal lensing

Original Manuscript: October 19, 1999
Revised Manuscript: February 14, 2000
Published: June 1, 2000

Marcelo Martinelli, Marcos Gugliotti, and Ricardo Josué Horowicz, "Measurement of refractive-index change at a liquid–solid interface close to the critical angle," Appl. Opt. 39, 2733-2736 (2000)

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