title: CO2 laser writing of long-period fiber grating in photonic crystal fiber under tension.
abstract: We demonstrate that the efficiency of CO(2) laser writing of long-period fiber gratings in a solid-core photonic crystal fiber (PCF) can be enhanced greatly by applying tension to the fiber during the writing process through the mechanism of frozen-in viscoelasticity. Using this mechanism, we are able to write strong gratings in PCFs with a dosage of CO(2) laser radiation low enough not to cause any significant fiber structure deformation.
authors.affiliation: Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: H W
authors.initials: HW
authors.lastname: Lee
authors.forename: K S
authors.initials: KS
authors.lastname: Chiang