1.
Appl Opt
; 40(21): 3506-8, 2001 Jul 20.
Article
in English
| MEDLINE
| ID: mdl-18360376
ABSTRACT
We report on permanent refractive-index changes as great as 6 x 10(-3) in standard fibers on irradiation with tightly focused femtosecond (120-fs) near-IR (lambda = 800-nm) pulses. The refractive-index increase was measured through changes in the transmission spectrum of an UV photowritten Bragg-grating-based Fabry-Perot interferometer. We depict the dependence of the index variation on exposure time. The changes in refractive index can be optimized after a few seconds of irradiation. The measured induced excess loss increases during near-IR exposure.
2.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics
; 49(1): 815-827, 1994 Jan.
Article
in English
| MEDLINE
| ID: mdl-9961274