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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CA7_5

The study of thermo-mechanical and -optical properties of GdVO4 and YVO4

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Power scaling in the limited compact volume have been interested as a key issue of solid-state micro photonics, precise thermo-mechanical and -optical parameters such as thermal conductivity k, thermal expansion coefficient a, thermal refractive index coefficient dn/dT of laser media are required. A factor of κ/α is proportional to a thermal-shock parameter RT [1], and thus implies the resistance for thermo-mechanical effects. Similarly a factor of x/(dn/dT) is proportional to the focal length of thermal lens fT [1]. Since x of laser media are usually estimated by laser-flash method, previously reported values often contained error caused by non one-dimensional thermal conduction and heat transmission through radiation. We proposed qlD-flash method to avoid these error factors [2], and found that x of Nd:YVO4 is twice the well-known value, and is larger than Nd:GdVO4 and Nd:YAG. This result indicated that RT of Nd:YVO4 should be larger than currently recognized value. In this work we summarized thermal characteristics of YVO4 with comparative study of GdVO4 by using of carefully evaluated k, a, dn/dT, thermal heat capacity coefficient dCp/dT, and thermal conductivity coefficient dk/dT.

© 2007 IEEE

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