Open AccessTheory and experiment of refractive index change of long-period fiber grating induced by CO2 laser pulses
Author(s) -
Zhu Tao,
Shi Cui-Hua,
Yunjiang Rao,
Chiang Kin-Seng
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.6316
Subject(s) - materials science , long period fiber grating , optics , refractive index , cladding (metalworking) , graded index fiber , laser , fiber bragg grating , fabrication , optical fiber , grating , interferometry , optoelectronics , fiber , fiber optic sensor , composite material , physics , wavelength , medicine , alternative medicine , pathology
The mechanism of refractive index change of long period fiber gratings LPFGs induced by high frequency CO2 laser pulses is investigated in theory and by experiment. It is found that the release of residual stress, rapid solidification, fiber densification and fusion distortion are discovered to be the main mechanisms of formation of this kind of gratings. The above four mechanisms play different roles when different fibers, different scanning methods and the different laser power were used in the process of LPFG fabrication. The average refractive index changes of the core and cladding were measured by using M-Z interferometer formed by LPFG pair in this paper, which provides the experimental basis for fabricating all-fiber devices.