Photonics Research, 2016, 4 (6): 06000327, Published Online: Dec. 23, 2016
Self-starting passively mode-locked all fiber laser based on carbon nanotubes with radially polarized emission Download: 874次
Fibers Fibers erbium erbium Lasers Lasers fiber fiber Fiber Bragg gratings Fiber Bragg gratings Mode-locked lasers Mode-locked lasers Nanomaterials Nanomaterials
Abstract
We demonstrate an all fiber passively mode-locked laser emitting a radially polarized beam by using a few-mode fiber Bragg grating to achieve mode selection and spectrum filtering. An offset splicing of single-mode fiber with four-mode fiber is utilized as a mode coupler in the laser cavity. Carbon nanotubes are introduced into the laser cavity as the saturable absorber to achieve self-start mode locking. The laser operates at 1547.5 nm with a narrow spectrum width of 0.3 nm at 30 dB. The emitted mode-locked pulses have a duration of 22.73 ps and repetition of 10.61 MHz. A radially polarized beam has been obtained with high mode purity by adjusting the polarization in the laser cavity.
Yong Zhou, Jian Lin, Xiaoqiang Zhang, Lixin Xu, Chun Gu, Biao Sun, Anting Wang, Qiwen Zhan. Self-starting passively mode-locked all fiber laser based on carbon nanotubes with radially polarized emission[J]. Photonics Research, 2016, 4(6): 06000327.