High efficiency all-fiber cylindrical vector beam laser using a long-period fiber grating
| Autor: | Qiwen Zhan, Anting Wang, Wang Jinghao, Feng Li, Ruishan Chen, Xiaoqiang Zhang, Dick Chung, Hai Ming |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Slope efficiency Physics::Optics 02 engineering and technology Long-period fiber grating Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Laser linewidth 020210 optoelectronics & photonics Optics Fiber Bragg grating law Optical cavity Fiber laser 0103 physical sciences 0202 electrical engineering electronic engineering information engineering business Lasing threshold |
| Zdroj: | Optics letters. 43(4) |
| ISSN: | 1539-4794 |
| Popis: | We demonstrate a novel all-fiber laser generating cylindrical vector beams with high slope efficiency and low threshold by introducing a long-period fiber grating into the laser cavity. Highly efficient mode conversion is realized by an LPFG at ∼1548 nm. Mode selection and spectrum filtering are achieved in combination with a two-mode fiber Bragg grating (TM-FBG). The fiber laser operates at a single wavelength of 1547.95 nm with a 30 dB linewidth of less than 0.18 nm and a side-mode suppression ratio (SMSR) of more than 56 dB. The lasing threshold and slope efficiency of the laser are 24.5 mW and 35.41%, respectively. The output power is 72 mW with an absorbed pump power of 225 mW. The variation of slope efficiency with respect to the reflectivity of the TM-FBG is investigated. Through adjusting the intra-cavity polarization controller, high-purity radially and azimuthally polarized beams are both obtained. |
| Databáze: | OpenAIRE |
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