Title :
CO2-laser writing of long period fiber grating in photonic crystal fiber by frozen-in viscoelasticity
Author :
Lee, H.W. ; Chiang, K.S.
Author_Institution :
Max-Planck Res. Group, Univ. of Erlangen-Nuremberg, Erlangen, Germany
Abstract :
Long period fiber gratings (LPFGs) formed in photonic crystal fibers (PCFs) are of considerable interest because they can provide many new opportunities for optical and biochemical sensing. LPFGs can be fabricated in PCFs by intense CO2-laser radiation through deforming the fiber geometry or changing the glass structure. In this paper, we report a new, efficient way of writing LPFGs in PCFs, which is based on the generation of frozen-in inelastic tensile stresses in a tensioned PCF by CO2-laser heating. The mechanism, known as frozen-in viscoelasticity, can also improve the writing efficiency of LPFGs in conventional single-mode fibers.
Keywords :
diffraction gratings; holey fibres; laser materials processing; optical fibre fabrication; optical glass; photonic crystals; viscoelasticity; LPFG fabrication; biochemical sensing; fiber geometry deformation; frozen-in viscoelasticity; glass structure deformation; inelastic tensile stress; laser heating; laser writing; long-period fiber grating; optical sensing; photonic crystal fiber; Biomedical optical imaging; Elasticity; Fiber gratings; Geometrical optics; Glass; Heating; Optical sensors; Photonic crystal fibers; Tensile stress; Viscosity;
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
DOI :
10.1109/CLEOE-EQEC.2009.5196281
