Koyama Mio, Hirose Tetsuya, Okida Masahito, Miyamoto Katsuhiko, Omatsu Takashige
Graduate School of Advanced Integration Science, Chiba University,1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Opt Express. 2011 Jul 18;19(15):14420-5. doi: 10.1364/OE.19.014420.
Nanosecond vortex pulses were generated using a stressed, large-mode-area, Yb-doped, fiber amplifier with an off-axis coupling technique for the first time. A pulse energy of 0.83 mJ (corresponding to a peak power of 59 kW) was achieved at a pump power of 25.7 W. The optical-optical efficiency was measured to be 31%. The millijoule nanosecond vortex pulses will be potentially applied to novel material processing, such as metal microneedle fabrication.
首次使用一种采用离轴耦合技术的受应力大模面积掺镱光纤放大器产生了纳秒涡旋脉冲。在25.7W的泵浦功率下实现了0.83mJ的脉冲能量（对应峰值功率为59kW）。测得光光效率为31%。毫焦耳纳秒涡旋脉冲将有可能应用于新型材料加工，如金属微针制造。
