NDLI: Photosensitization of standard fibers with deep UV laser radiation

Content Provider	IEEE Xplore Digital Library
Author	Chen, K.P. Herman, P.R.
Copyright Year	1983
Abstract	A strong and permanent ultraviolet photosensitivity enhancement was locked into standard optical fiber pre-treated with above-bandgap 157-nm F/sub 2/-laser radiation. Below-bandgap 248-nm irradiation of the pre-treated fiber yielded fiber Bragg gratings (FBGs) with an index contrast of 6.5 /spl times/ 10/sup -4/, a value four-fold larger than that available in 16% Ge-doped photosensitive fiber. The F/sub 2/-laser photosensitivity locking was 300 times more effective than with KrF-laser pre-treatment in terms of the accumulated fluence required to lock in a similar refractive index change. Accelerated FBG aging tests equivalent to 25 years at 70/spl deg/C revealed a less than 2% reflectivity decay in both 157- and 248-nm pre-treated fibers, which is sufficient to eliminate the postannealing step typically required in hydrogen-loaded fibers. The large photosensitization and the superior thermal stability of both 248- and 157-nm pre-treated fibers are associated with a new Si-H bond absorption feature at 1387 nm, which appears only during the FBG formation step.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	1958
Ending Page	1968
Page Count	11
File Size	546710
File Format	PDF
ISSN	07338724
Volume Number	21
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fiber lasers Optical fiber testing Optical fibers Fiber gratings Bragg gratings Refractive index Accelerated aging Life estimation Reflectivity Thermal stability
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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