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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 4 — Feb. 1, 2011
  • pp: 526–531

Interferometric measurement of laser heating in praseodymium-doped YAG crystal

Carlton W. Farley, III and B. Rami Reddy  »View Author Affiliations

Applied Optics, Vol. 50, Issue 4, pp. 526-531 (2011)

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Temperature measurement is required for many applications but can be difficult in some cases. Laser heating or cooling studies demand accurate measurements of temperature changes. A Michelson interferometer configuration has been used to investigate laser heating in solids. An analytical formula was derived to estimate the temperature change from the fringe count by taking into account the temperature dependence of the sample length and refractive index. When 115 mW of a focused Ar + laser beam ( 488 nm ) passes through a Pr 3 + -doped YAG sample, its temperature increased by 11.7 ± 1.0 K along the beam path due to nonradiative relaxation. The power dependence of the fringe count/movement was recorded. The temperature change was estimated by the interferometric method and is in agreement with that measured by a thermocouple.

© 2011 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.6780) Instrumentation, measurement, and metrology : Temperature
(280.6780) Remote sensing and sensors : Temperature

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 14, 2010
Revised Manuscript: August 24, 2010
Manuscript Accepted: November 25, 2010
Published: January 27, 2011

Carlton W. Farley, III and B. Rami Reddy, "Interferometric measurement of laser heating in praseodymium-doped YAG crystal," Appl. Opt. 50, 526-531 (2011)

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