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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 7 — Mar. 31, 2008
  • pp: 5022–5034

Thermal properties of monoclinic KLu(WO4)2 as a promising solid state laser host

Òscar Silvestre, Joan Grau, Maria Cinta Pujol, Jaume Massons, Magdalena Aguiló, Francesc Díaz, Mieczyslaw Tadeusz Borowiec, Andrzej Szewczyk, Maria Urszula Gutowska, Marta Massot, Agustín Salazar, and Valentin Petrov  »View Author Affiliations


Optics Express, Vol. 16, Issue 7, pp. 5022-5034 (2008)
http://dx.doi.org/10.1364/OE.16.005022


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Abstract

Thermal analysis of the monoclinic solid state laser host KLu(WO4)2 is presented. The specific heat was measured by the relaxation method in the temperature range from 1.9 to 385 K: its value at room temperature is 0.324 J/gK. The Debye temperature and the sound velocity amount to 303±3 K and 3734 m/s. The linear thermal expansion tensor was measured by X-ray powder diffraction from room temperature up to 773 K. The eigenvalues of this tensor are α11=8.98×10-6 K-1, α22=3.35×10-6 K-1, and α33=16.72×10-6 K-1, with the maximum value in the a-b crystallographic plane, at 31.94° from the Ng principal optical axis. The thermal diffusivity and its anisotropy in the temperature range between 300 and 500 K were measured by the pyroelectric method to determine the thermal conductivity tensor. The eigenvalues of the thermal conductivity are κ11=2.95 Wm-1K-1, κ22=2.36 Wm-1K-1, and κ33=4.06 Wm-1K-1, with the maximum value along a direction again in the a-b crystallographic plane, at 40.75° from the Ng principal optical axis. Simulation of the temperature distribution in a bulk sample of KLu(WO4)2 with dimensions 3×3×3 mm3 shows that pump and laser beam directions along the Np principal optical axis in terms of thermal effects are preferable because the propagation is along a quasi-isothermal path.

© 2008 Optical Society of America

OCIS Codes
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(140.3580) Lasers and laser optics : Lasers, solid-state

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 30, 2007
Revised Manuscript: February 15, 2008
Manuscript Accepted: February 18, 2008
Published: March 27, 2008

Citation
Òscar Silvestre, Joan Grau, Maria Cinta Pujol, Jaume Massons, Magdalena Aguiló, Francesc Díaz, Mieczyslaw T. Borowiec, Andrzej Szewczyk, Maria U. Gutowska, Marta Massot, Agustín Salazar, and Valentin Petrov, "Thermal properties of monoclinic KLu(WO4)2 as a promising solid state laser host," Opt. Express 16, 5022-5034 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-7-5022


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