The conversion of transverse mode-locked (TML) laser beams from a Hermite-Gaussian (HG) to a Laguerre-Gaussian (LG) mode set using a cylindrical lens mode converter was demonstrated experimentally. By changing the spatial symmetry of the beams new spatio-temporal dynamics for TML lasers were enabled. In particular, the fast linear motion of an oscillating laser spot, generated by a TML laser based on HG modes, was translated into the circular motion of a TML laser beam based on LG modes. The mode conversion was demonstrated successfully for different average mode orders. Apart from an average ellipticity of about \(6\%\), the converted beam profiles remained circular over the propagation from the near- into the far-field. The remaining ellipticity seemed to be introduced by astigmatism of the incident HG TML beam, which could be compensated before conversion. Due to their radial symmetry and high scanning speed TML laser beams based on LG modes are well suited for precision applications like STED or Minflux microscopy.

实验证明了使用柱面透镜模式转换器将横向锁模（TML）激光束从Hermite-Gaussian（HG）转换为Laguerre-Gaussian（LG）模式集。通过改变光束的空间对称性，可以为TML激光器提供新的时空动力学。特别地，由基于HG模式的TML激光器产生的振荡激光点的快速线性运动转换为基于LG模式的TML激光束的圆周运动。已成功演示了针对不同平均模式顺序的模式转换。除了平均椭圆率约为\（6 \％\），转换后的光束轮廓在从近场到远场的传播过程中保持圆形。剩余的椭圆率似乎是由入射HG TML光束的像散引入的，可以在转换前对其进行补偿。由于其径向对称性和高扫描速度，基于LG模式的TML激光束非常适合STED或Minflux显微镜等精密应用。