Title :
Fabrication of Long-Period Gratings by Femtosecond Laser-Induced Filling of Air-Holes in Photonic Crystal Fibers
Author :
Liu, Shujing ; Jin, Long ; Jin, Wei ; Wang, Yiping ; Wang, D.N.
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech. Univ., Hong Kong, China
Abstract :
A new method for fabricating long-period gratings (LPGs) in photonic crystal fibers (PCFs) is presented. A tightly focused femtosecond infrared laser beam scans across a PCF periodically, resulting in periodic filling of cladding air-holes through a micro-explosion and redeposition process and forming an LPG. Strong resonance of ~26 dB has been demonstrated with a grating length of <;5 mm. An annealed LPG demonstrated stable operation at 800°C for over 30 h.
Keywords :
annealing; claddings; diffraction gratings; high-speed optical techniques; holey fibres; laser beam machining; optical fabrication; photonic crystals; air-hole cladding; annealing; femtosecond infrared laser beam; femtosecond laser-induced filling; grating length; long-period grating fabrication; microexplosion; photonic crystal fibers; redeposition process; temperature 800 degC; Fabrication; Fiber gratings; Fiber lasers; Gratings; Laser beams; Silicon compounds; Temperature measurement; Femtosecond laser micromachining; long-period grating (LPG); optical fiber sensor; photonic crystal fiber (PCF);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2076275
