Generation of the Tunable Second-Order Optical Vortex Beams in Narrow Linewidth Fiber Laser
| Autor: | Yue Wu, Shiying Xiao, Youchao Jiang, Shuisheng Jian, Guobin Ren, Shuzhi Yao, Yuguang Yang, Yao Xu, Wenxing Jin, Ya Shen |
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| Rok vydání: | 2017 |
| Předmět: |
Mode volume
Distributed feedback laser Materials science business.industry Physics::Optics Polarization-maintaining optical fiber 02 engineering and technology Graded-index fiber Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Laser linewidth 020210 optoelectronics & photonics Optics Fiber laser 0202 electrical engineering electronic engineering information engineering Dispersion-shifted fiber Physics::Atomic Physics Electrical and Electronic Engineering business Photonic-crystal fiber |
| Zdroj: | IEEE Photonics Technology Letters. 29:1659-1662 |
| ISSN: | 1941-0174 1041-1135 |
| DOI: | 10.1109/lpt.2017.2742519 |
| Popis: | We experimentally demonstrate a narrow linewidth single-longitudinal-mode erbium-doped fiber ring laser with an output of tunable second-order optical vortex beams (OVB). The laser is based on a mode selective all-fiber fused coupler, which is composed of a single-mode fiber (SMF) and a few-mode fiber (FMF). The fused SMF–FMF coupler inserted in the cavity of the laser acts as a mode converter, which converts LP01 mode to LP21 mode group. The tunable OVB is produced by combing two even LP21 modes with orthogonal polarization directions. The tunability of second order OVB in the fiber laser is experimentally realized by adjusting a polarizer at the output end of the fiber. The 20 dB linewidth of the fiber laser is approximate 7.2 kHz. |
| Databáze: | OpenAIRE |
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