Tung Jung-Chen, Liu Kai-Wei, Chen Shen-Chen
Opt Lett. 2022 Feb 15;47(4):945-948. doi: 10.1364/OL.444803.
We employ a selectively pumped solid-state laser with stimulated Raman scattering and second-harmonic generation to generate frequency-doubled lasing modes (FDLMs) at 588 nm. The FDLMs are transformed by using an external cylindrical mode converter to generate various structured beams with multiple optical vortices. Theoretical analyses clearly reveal the relationship between the mode components in the laser emission and the transverse displacement of the off-center pumping. We further verify that the experimental results for the transformed FDLMs can be numerically reconstructed with a theoretical model. By analyzing the phase structures of the converted beams, it can be demonstrated that the number of vortices rises from 2 to 19 with increasing off-center displacement.
我们采用具有受激拉曼散射和二次谐波产生的选择性泵浦固态激光器，以产生588 nm的倍频激光模式（FDLMs）。通过使用外部柱面模式转换器对FDLMs进行变换，以产生具有多个光学涡旋的各种结构化光束。理论分析清楚地揭示了激光发射中的模式分量与偏心泵浦横向位移之间的关系。我们进一步验证了变换后的FDLMs的实验结果可以用理论模型进行数值重建。通过分析转换光束的相位结构，可以证明随着偏心位移的增加，涡旋数量从2增加到19。
