title: Gain-guided index-antiguided fiber with a Fabry-Perot layer for large mode area laser amplifiers.
abstract: 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.
authors.forename: Chih-Hsien
authors.initials: CH
authors.lastname: Lai
authors.forename: Hsuan-Yu
authors.initials: HY
authors.lastname: Chen
authors.forename: Cheng-Han
authors.initials: CH
authors.lastname: Du
authors.forename: Yih-Peng
authors.initials: YP
authors.lastname: Chiou