Title :
Silica-air double-clad optical fiber
Author :
Kozlov, V.A. ; Hernández-Cordero, J. ; Shubochkin, R.L. ; Carter, A.L.G. ; Morse, T.F.
Author_Institution :
Lab. for Lightwave Technol., Boston Univ., MA, USA
Abstract :
A new design of the silica-air double-clad optical fiber is proposed. The fiber was prepared from an MCVD preform inserted into a supporting silica tube with a fluorine-doped connective element with a lower refractive index (/spl Delta/n/spl sim/-4/spl times/10/sup -3/) and air as the second cladding. A numerical aperture as high as 0.3 was measured for the first cladding and for fiber lengths up to 50 cm. Although it is realized that the results are preliminary, the optimization of the fiber parameters promises a new all-glass design for double-clad optical fibers for high-power fiber laser applications.
Keywords :
MOCVD; air; fibre lasers; optical design techniques; optical fibre cladding; optical fibre fabrication; optical fibre testing; optimisation; refractive index; silicon compounds; 50 cm; F-doped connective element; MCVD preform; SiO/sub 2/; all-glass design; design; double-clad optical fiber; double-clad optical fibers; fiber lengths; fiber parameters; first cladding; high-power fiber laser applications; numerical aperture; optical fiber; optimization; refractive index; second cladding; silica-air double-clad optical fiber; supporting silica tube; Diode lasers; Fiber lasers; Laser excitation; Laser modes; Optical design; Optical fiber devices; Optical fibers; Preforms; Pump lasers; Silicon compounds;
Journal_Title :
Photonics Technology Letters, IEEE
