Chinese Optics Letters, 2019, 17 (5): 051402, Published Online: May. 20, 2019  

LG11-mode vortex Nd:YAG laser by applying second-order circular Dammann grating for annular pumping Download: 827次

Author Affiliations
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract
The excitation of high-order Laguerre–Gaussian (LG) modes in a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser resonator was presented by applying the diffraction of a second-order circular Dammann grating (CDG) for annular pumping. In the study, the 808 nm pump light was shaped into a double-ring structure by the CDG and matched spatially with that of an ideal LG11 mode. As a result, the laser resonator generated an LG11 vortex mode, and the laser power reached 204 mW with 14.5% slope efficiency. Also, when the cavity mirror was tilted, the laser output could switch to the LG01 vortex mode. The results showed the convenience and versatility of CDG in an annular-pumped vortex laser.

Quan Zhang, Junjie Yu, Biran Shi, Fanchun Tang, Jianlang Li. LG11-mode vortex Nd:YAG laser by applying second-order circular Dammann grating for annular pumping[J]. Chinese Optics Letters, 2019, 17(5): 051402.

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