Numerical model for thermal parameters in optical materials

Yoichi Sato; Takunori Taira

doi:10.1117/12.2229386

27 April 2016 Numerical model for thermal parameters in optical materials

Yoichi Sato, Takunori Taira

Proceedings Volume 9893, Laser Sources and Applications III; 98930F (2016) https://doi.org/10.1117/12.2229386
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

Thermal parameters of optical materials, such as thermal conductivity, thermal expansion, temperature coefficient of refractive index play a decisive role for the thermal design inside laser cavities. Therefore, numerical value of them with temperature dependence is quite important in order to develop the high intense laser oscillator in which optical materials generate excessive heat across mode volumes both of lasing output and optical pumping. We already proposed a novel model of thermal conductivity in various optical materials. Thermal conductivity is a product of isovolumic specific heat and thermal diffusivity, and independent modeling of these two figures should be required from the viewpoint of a clarification of physical meaning. Our numerical model for thermal conductivity requires one material parameter for specific heat and two parameters for thermal diffusivity in the calculation of each optical material. In this work we report thermal conductivities of various optical materials as Y₃Al₅O₁₂ (YAG), YVO₄ (YVO), GdVO₄ (GVO), stoichiometric and congruent LiTaO₃, synthetic quartz, YAG ceramics and Y₂O₃ ceramics. The dependence on Nd³⁺-doping in laser gain media in YAG, YVO and GVO is also studied. This dependence can be described by only additional three parameters. Temperature dependence of thermal expansion and temperature coefficient of refractive index for YAG, YVO, and GVO: these are also included in this work for convenience. We think our numerical model is quite useful for not only thermal analysis in laser cavities or optical waveguides but also the evaluation of physical properties in various transparent materials.

Citation Download Citation

Yoichi Sato and Takunori Taira "Numerical model for thermal parameters in optical materials", Proc. SPIE 9893, Laser Sources and Applications III, 98930F (27 April 2016); https://doi.org/10.1117/12.2229386

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KEYWORDS

Ceramics

YAG lasers

Thermal modeling

Crystals

Quartz

Laser resonators

Refractive index

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