Band bleaching and growth dynamics in 45%GeO{sub 2}--55%SiO{sub 2} films
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1423 (United States)
- Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States)
Photoinduced changes in the ultraviolet absorption bands of GeO{sub 2}--SiO{sub 2} glasses have a clear significance in photosensitive processes. In this letter, the dynamics of bleaching and growth of absorption bands in highly photosensitive germanosilicate thin films following exposure to 248 nm excimer laser radiation are discussed. Strong evidence is found in support of a single-photon process for the bleaching of a band at 238 nm and growth of a band at 202.5 nm as a source of photosensitivity. Calculated changes in refractive index are eight times greater than those found in two-photon-induced grating experiments. This suggests avenues for enhancement of photosensitive effects through proper materials conditioning.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 29249
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 66; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Two-photon absorption in SiO{sub 2}- and (SiO{sub 2} + GeO{sub 2})-based fibres at a wavelength of 349 nm
Periodic precipitation of crystalline Ge nanoparticles in Ge-B-SiO{sub 2} thin glass films