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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 29, Iss. 18 — Sep. 15, 2004
  • pp: 2127–2129

Hydrogen loading for fiber grating writing with a femtosecond laser and a phase mask

Christopher W. Smelser, Stephen J. Mihailov, and Dan Grobnic  »View Author Affiliations


Optics Letters, Vol. 29, Issue 18, pp. 2127-2129 (2004)
http://dx.doi.org/10.1364/OL.29.002127


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Abstract

The threshold for the fabrication of fiber Bragg gratings with ultrafast 800-nm radiation and a phase mask was studied in SMF-28 and all-silica core fiber by use of 125-fs pulses. High-pressure molecular hydrogen loading (H2 loading) was observed to significantly lower the grating writing threshold in standard Ge-doped telecommunication fiber. No reduction was observed with all-silica core fiber. The index change appeared to be confined to the Ge-doped core region of the fiber. Gratings in H2-loaded SMF-28 had thermal annealing behavior similar to UV-induced gratings. Unlike UV-induced H2-loaded gratings, no absorption associated with Ge–OH defect formation was observed.

© 2004 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7140) Ultrafast optics : Ultrafast processes in fibers
(350.3390) Other areas of optics : Laser materials processing

Citation
Christopher W. Smelser, Stephen J. Mihailov, and Dan Grobnic, "Hydrogen loading for fiber grating writing with a femtosecond laser and a phase mask," Opt. Lett. 29, 2127-2129 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-18-2127

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