Title :
Simultaneous observation of photobleaching and photorefractive effects in germanium-doped optical fibers
Author :
Kanellopoulos, S.E. ; Handerek, V.A. ; Jamshidi, H. ; Rogers, A.J.
Author_Institution :
Dept. of Electron. & Electr. Eng., King´´s Coll., London, UK
fDate :
3/1/1991 12:00:00 AM
Abstract :
Photobleaching and photorefractive effects caused by intense pulsed laser irradiation at 532 nm have been observed simultaneously in a germanium-doped monomode fiber. A decrease of up to 4.1*10/sup -4/ in the refractive index of the core at 633 nm was inferred from the change in the radiation pattern of a probe beam and also from the change in the cutoff wavelength of the LP/sub 11/ mode. The effect is attributed to the bleaching of preexisting Ge(1) color centers in the fiber.<>
Keywords :
colour centres; germanium; optical fibres; optical saturable absorption; photorefractive effect; refractive index; 532 nm; 633 nm; Ge(1) color centers; LP/sub 11/ mode; SiO/sub 2/-GeO/sub 2/; cutoff wavelength; intense pulsed laser irradiation; monomode fiber; optical fibers; photobleaching; photorefractive effects; probe beam; radiation pattern; refractive index; Bleaching; Fiber lasers; Laser beams; Optical fibers; Optical pulses; Photobleaching; Photorefractive effect; Probes; Refractive index; Solid lasers;
Journal_Title :
Photonics Technology Letters, IEEE
