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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 13 — Jul. 1, 2014
  • pp: 4013–4016

Discriminating the role of sample length in thermal lensing of solids

T. P. Rodrigues, V. S. Zanuto, R. A. Cruz, T. Catunda, M. L. Baesso, N. G. C. Astrath, and L. C. Malacarne  »View Author Affiliations


Optics Letters, Vol. 39, Issue 13, pp. 4013-4016 (2014)
http://dx.doi.org/10.1364/OL.39.004013


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Abstract

Thermal lens (TL) is a key effect in laser engineering and photothermal spectroscopy. The amplitude of the TL signal or its dioptric power is proportional to the optical path difference (OPD) between the center and border of the beam, which is proportional to the heat power (Ph). Due to thermally induced mechanical stress and bulging of end faces of the sample, OPD depends critically on the geometry of the sample. In this investigation, TL measurements were performed as a function of the sample length keeping the same Ph. It is experimentally demonstrated that for materials with positive n/T OPD increases typically 30 to 50% with the decrease of sample length (from long rod to thin-disk geometry). For materials with negative n/T, this variation is much larger due to the cancelation of the different contributions to OPD with opposite signs. Furthermore, the experimental investigation presented here validates a recently proposed unified theoretical description of the TL effect.

© 2014 Optical Society of America

OCIS Codes
(300.6430) Spectroscopy : Spectroscopy, photothermal
(350.5340) Other areas of optics : Photothermal effects

ToC Category:
Spectroscopy

History
Original Manuscript: March 31, 2014
Revised Manuscript: April 29, 2014
Manuscript Accepted: May 25, 2014
Published: June 30, 2014

Citation
T. P. Rodrigues, V. S. Zanuto, R. A. Cruz, T. Catunda, M. L. Baesso, N. G. C. Astrath, and L. C. Malacarne, "Discriminating the role of sample length in thermal lensing of solids," Opt. Lett. 39, 4013-4016 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-13-4013


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