Temperature dependence of refractive index of glassy SiO2 in the infrared wavelength range

✍ Scribed by C.Z. Tan; J. Arndt

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 197 KB
• Volume: 61
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00411-4

✦ Synopsis

An interferometric method was used for the determination of refractive index of glassy SiO 2 in the infrared (IR) wavelength region 1:44 Ͻ l Ͻ 4:77 mm at temperatures ranging from 23.5 to 481ЊC by IR spectroscopy. The refractive index was found to increase with temperature at a given wavelength. Irregularities of the thermal coefficient of the refractive index dn=dT with temperature were observed and explained by the existence of crystal-like microstructures in silica glass. Optical dispersion dn=dl exhibits a maximum at a given temperature. The wavelength at the maximum depends on temperature, showing irregularities with temperature like the thermal coefficient of refractive index.