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Applied Optics

Applied Optics


  • Vol. 38, Iss. 15 — May. 20, 1999
  • pp: 3282–3284

Thermal coefficients of the expansion and refractive index in YAG

Rosalind Wynne, John L. Daneu, and Tso Yee Fan  »View Author Affiliations

Applied Optics, Vol. 38, Issue 15, pp. 3282-3284 (1999)

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The thermal expansion coefficient and dn/dT are measured by interferometry techniques in undoped YAG below 300 K. The thermal expansion coefficient at 125 K is measured to be 2.70 × 10-6 K-1 and dn/dT at 633 nm is 2.5 × 10-6 K-1, compared with 7 × 10-6 K-1 and 9 × 10-6 K-1 for these quantities at 300 K.

© 1999 Optical Society of America

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.6810) Lasers and laser optics : Thermal effects
(160.3380) Materials : Laser materials
(160.4760) Materials : Optical properties

Original Manuscript: November 23, 1998
Revised Manuscript: February 22, 1999
Published: May 20, 1999

Rosalind Wynne, John L. Daneu, and Tso Yee Fan, "Thermal coefficients of the expansion and refractive index in YAG," Appl. Opt. 38, 3282-3284 (1999)

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  8. Note that in Refs. 6 and 7 the tabulated thermal expansion coefficients at low temperature are much larger than indicated by the tabulated lattice constants. This is so because the tabulated expansion coefficients were not calculated correctly in Refs. 6 and 7. They appear to have been calculated with the equation α(TC) = [a(TC) - a(0)]/TC, where TC is the temperature in degrees Celsius and a(TC) is the temperature-dependent lattice constant. This actually gives an estimate for α(TC/2) and not for α(TC), and consequently the tabulated values for thermal expansion coefficient are too large.
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  15. V. V. Blazhko, M. M. Bubnov, E. M. Dianov, A. V. Chikolini, “Determination of the temperature dependence of the linear expansion coefficient and of the temperature coefficient of the refractive index of laser glasses,” Sov. J. Quantum Electron. 6, 624–625 (1976). [CrossRef]
  16. K. L. Ovanesyan, A. G. Petrosyan, G. O. Shirinyan, A. A. Avetisyan, “Optical dispersion and thermal expansion of garnets Lu3Al5O12, Er3Al5O12, and Y3Al5O12,” Inorg. Mater. 17, 308–310 (1981).

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