Abstract
Photobleachable defects are often formed in gemnanosilicate glasses during preform fabrication and fiber drawing. Rapid cooling, stress gradients, and exposure to a chemical reducing agent, such as hydrogen, or an oxygen deficient atmosphere increase the photosensitivity. Of particular interest is the presence of an ultraviolet absorption band at 242 nm, commonly assigned to the occurrence of an oxygen vacancy in the glass network. These sites are precursors of photoinduced paramagnetic Ge E' centers and other, yet not clearly defined, color centers that provide a permanent change in the refractive index with negligible additional fiber absorption in the infrared.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
