Thermal considerations on the design and operation of lens ducts

✍ Scribed by H. Golnabi

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 327 KB
• Volume: 35
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(03)00036-7

✦ Synopsis

In this paper, heat e ects due to powerful pump beam in the lens duct delivery system is investigated and subsequent thermal e ects are described. Temperature raise in the device, thermal loading, and material considerations for the lens ducts fabrication are reported. For an absorbed intensity of 10 W=cm 2 in a 4 cm-long lens duct, the temperature di erence between the midpoint and its faces, for a lens duct made from borosilicate is 7:05 • C, for sapphire 4:01 • C, and for synthetic fused silica is the smallest value of 0:54 • C. For a typical absorbed intensity of 1:4 W=cm 2 in a 4 cm-long lens duct, with a steady-state time constant of 120 s, the fractional thermal loading is 1.98% for BK-7, 1.89% for sapphire, and only 0.16% for synthetic fused silica. By considering di erent glass materials, the overall results show that synthetic fused silica is superior to some other materials for the fabrication of a lens duct. The reported analytical method and the results of parametric studies can be helpful in material selection and construction of an e ective lens duct.