Title :
Helical-core Yb-doped fibre laser
Author :
Wang, P. ; Cooper, L.J. ; Clarkson, W.A. ; Nilsson, J. ; Williams, R.B. ; Sahu, J.K. ; Vogel, A.K.
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
Abstract :
In this paper we report a new approach for achieving robust single-mode operation in a large-core fibre laser or amplifier by employing a core, which has a helical trajectory within the cladding material. As a confirmation of the benefits of the helical-core geometry, an Yb-doped fibre with a straight core of the same diameter and numerical aperture was tested, which yielded a multimode output beam with beam propagation factor, M2=5.5 and ∼50% of the fibre output rejected from the polariser.
Keywords :
fibre lasers; laser modes; optical fibre cladding; optical fibre testing; optical pumping; ytterbium; Yb-doped fibre laser; cladding material; fibre amplifier; helical core; multimode beam; polariser; Apertures; Fiber lasers; Geometrical optics; Laser beams; Operational amplifiers; Optical fiber polarization; Optical fiber testing; Optical materials; Optical propagation; Robustness;
Conference_Titel :
Lasers and Electro-Optics Europe, 2003. CLEO/Europe. 2003 Conference on
Print_ISBN :
0-7803-7734-6
DOI :
10.1109/CLEOE.2003.1313674
