Wu Fan, Liu Heyan, Yan Lisong, Liu Hongyu, Cui Qingzhe, Dai Kunjian, Li Hengyang, Qin Yingxiong, Wang Qing, Zhang Jinwei
Opt Lett. 2024 Oct 15;49(20):5747-5750. doi: 10.1364/OL.528585.
Mode-locked oscillators with high-order transverse modes are excellent platforms for generating femtosecond optical vortices with high average power and good propagation stability. These have important applications in diverse fields such as optical communication, strong-field physics, and laser processing. So far, generating vortex pulses with ultrashort pulse duration remains a challenge. In this Letter, we report a Kerr-lens mode-locked Yb:CALGO laser oscillator delivering Hermite-Gaussian (HG) pulses with a pulse duration of 86 fs using a non-collinear pumping technique. 91 fs optical vortex pulses were generated by using a cylindrical-lens mode converter. To the best of our knowledge, this is the shortest pulse duration ever obtained from a diode pumped solid-state mode-locked oscillator with a pure high-order Hermite-Gaussian mode. The phase structures of the generated femtosecond vortices are characterized.
具有高阶横向模式的锁模振荡器是产生具有高平均功率和良好传播稳定性的飞秒光学涡旋的优秀平台。这些在光通信、强场物理和激光加工等不同领域具有重要应用。到目前为止，产生具有超短脉冲持续时间的涡旋脉冲仍然是一个挑战。在本信函中，我们报道了一种克尔透镜锁模Yb:CALGO激光振荡器，它使用非共线泵浦技术产生脉宽为86 fs的厄米-高斯（HG）脉冲。通过使用柱面透镜模式转换器产生了91 fs的光学涡旋脉冲。据我们所知，这是从具有纯高阶厄米-高斯模式的二极管泵浦固态锁模振荡器中获得的最短脉冲持续时间。对所产生的飞秒涡旋的相位结构进行了表征。
