TY - JOUR
T1 - Femtosecond laser writing of fibre Bragg gratings in large diameter air-clad optical fibre
AU - Groothoff, Nathaniel
AU - Jovanovic, Netnanja
AU - Marshall, Graham D.
AU - Canning, John
AU - Withford, Michael J.
PY - 2009/2
Y1 - 2009/2
N2 - Fibre Bragg gratings were written in large diameter (∼300-400 μm) air-clad optical fibre using an amplified Ti:Sapphire femtosecond laser (800 nm, 100 fs, 0-3 μJ/pulse) with the point-by-point method. Utilising multiphoton absorption, we induced modifications in the core of the air-clad fibre. By focusing the femtosecond laser close to the diffraction limit with a 20 × oil immersion microscope objective lens, the glass modification region is of the order of 1μm in the fibre, which has a 5 μm core diameter. A technique to avoid the scattering effect of the large air-silica index contrast, on the femtosecond radiation, was implemented. Grating rejection strengths of 20 dB were achieved with an accompanying insertion loss of 3-4 dB at 1085 nm.
AB - Fibre Bragg gratings were written in large diameter (∼300-400 μm) air-clad optical fibre using an amplified Ti:Sapphire femtosecond laser (800 nm, 100 fs, 0-3 μJ/pulse) with the point-by-point method. Utilising multiphoton absorption, we induced modifications in the core of the air-clad fibre. By focusing the femtosecond laser close to the diffraction limit with a 20 × oil immersion microscope objective lens, the glass modification region is of the order of 1μm in the fibre, which has a 5 μm core diameter. A technique to avoid the scattering effect of the large air-silica index contrast, on the femtosecond radiation, was implemented. Grating rejection strengths of 20 dB were achieved with an accompanying insertion loss of 3-4 dB at 1085 nm.
UR - http://www.scopus.com/inward/record.url?scp=77952765566&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:77952765566
SN - 0017-1050
VL - 50
SP - 75
EP - 78
JO - Glass Technology: European Journal of Glass Science and Technology Part A
JF - Glass Technology: European Journal of Glass Science and Technology Part A
IS - 1
ER -