All-fiber high-order mode laser using a metal-clad transverse mode filter

作者：Zhang, Yimin; Li, Hongxun; Dai, Chuansheng; Xu, Lixin; Gu, Chun; Chen, Wei; Zhu, Yonggang; Yao, Peijun^*; Zhan, Qiwen

来源：Optics Express, 2018, 26(23): 29679-29686.

DOI：10.1364/OE.26.029679

• CYLINDRICAL VECTOR BEAMS
• LONG-PERIOD FIBER

We propose and demonstrate an all-fiber laser with LP11 mode output. A transverse mode filter is designed and fabricated to suppress the fundamental mode and enable the fiber laser to oscillate in the second-order (LP11) transverse mode. The mechanism is to introduce relatively low ohmic loss for the TE01 mode and much higher ohmic losses for other modes through the loss of evanescent waves in the metal clad. The fiber laser operates at the center wavelength of 1053.9 nm with a narrow 3 dB linewidth of 0.019 nm. Four states of cylindrical vector mode with high modal purity are obtained through adjusting the intracavity polarization controller. This approach has great potentiality and scalability of realizing single high-order mode fiber laser, from which a wide range of applications could benefit.

• 出版日期2018-11-12
• 单位中国工程物理研究院; 中国工程物理研究院激光聚变研究中心; 上海理工大学; 中国科学技术大学