Spectral characteristics of the erbium-bismuth co-doped silica fibers and its application in single frequency fiber laser |
| |
Authors: | Y Q Qiu X Y Dong and C L Zhao |
| |
Institution: | (1) Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama-cho, Toyonaka, 560-8531 Osaka, Japan;(2) Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, 560-8531 Osaka, Japan;(3) Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, 560-8531 Osaka, Japan;(4) Department of Mechanical Engineering, The University of Tokushima, 2-1, Minami-Jyosanjima, 770-8506 Tokushima, Japan;(5) Faculty of Science, Department of Physics, Chiba University, 1-33 Yayoi-cho, Inage-ku, 283-8522 Chiba, Japan;(6) Optical Media Group, Storage Media Sysytems Development Center, Matsushita Electric Industrial Company, Ltd., 3-1-1 Yagumo-Nakamachi, 570-8501 Moriguchi, Japan |
| |
Abstract: | We developed two kinds of erbium (Er)-bismuth (Bi) co-doped silica fibers with different erbium doping concentrations. After
investigation of its spectral characteristics, it was found that the co-doping of the bismuth could alleviate the clustering
of the erbium ions in the silica fiber and thus improve the fluorescence efficiency. However, the near-infrared (NIR) fluorescence
spectrum attributed to the bismuth ions was different from that reported before and needs further comprehensive investigation.
For the heavy Er doped erbium-bismuth (Er-Bi) co-doped fiber (about 8000 ppm Er concentration), the optical absorption coefficients
at the wavelengths of 976 and 1530 nm are more than 40 and 90 dB/m, respectively. A couple of fiber Bragg gratings with proper
reflectivity were chosen to be spliced to 2 cm long of this fiber forming a compact linear cavity fiber laser. Upon the excitation
of the 976 nm laser diode, stable single frequency fiber laser operation was realized with a maximum side mode suppression
ratio more than 60 dB and a line-width less than 1 kHz. By splicing a segment of the Er fiber to the output end of the fiber
laser, the fiber laser worked in a master oscillator pumping amplifier (MOPA) structure and emitted an increased laser power
of more than 100 mW. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|