Open AccessGain-guided index-antiguided fiber with a Fabry-Perot layer for large mode area laser amplifiers
Author(s) -
Chih-Hsien Lai,
HsuanYu Chen,
Cheng-Han Du,
Yih-Peng Chiou
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.003876
Subject(s) - fabry–pérot interferometer , optics , materials science , cladding (metalworking) , fiber laser , amplifier , core (optical fiber) , laser , optical fiber , double clad fiber , wavelength , optoelectronics , graded index fiber , fiber optic sensor , physics , cmos , metallurgy
We propose a modified gain-guided index-antiguided (GGIAG) fiber structure for large mode area laser amplifiers, in which a thin dielectric layer is placed between the low-index core and the high-index cladding. The introduced dielectric layer functions as a Fabry-Perot etalon. By letting the resonant wavelength of the Fabry-Perot layer coincide with the signal wavelength, the signal is gain-guided in the fiber core. Moreover, the pump is confined in the low-index core owing to the antiresonant reflection originated from the Fabry-Perot layer. Numerical results indicate that the leakage loss of the pump can be minified over two orders of magnitude in the proposed structure, and thus the end-pumping efficiency could be enhanced significantly.