Dietz Thomas, Jenne Michael, Bauer Dominik, Scharun Michael, Sutter Dirk, Killi Alexander
Opt Express. 2020 Apr 13;28(8):11415-11423. doi: 10.1364/OE.383926.
An ultrafast Yb-doped thin-disk multi-pass laser amplifier system with flexible parameters for material processing is reported. We can generate bursts consisting of four pulses at a distance of 20 ns and a total energy of 46.7 mJ at a repetition rate of 25 kHz. In single-pulse operation, 1.5 kW of average output is achieved at 400 kHz when optimizing for a beam quality of M = 1.5. Alignment for maximum output power provides 1.9 kW at the same repetition rate. All results are obtained without chirped-pulse amplification in the multi-pass set-up. The application potential of the system is demonstrated exploring its performance in materials processing of dielectrics. Cleaving of 3.8-mm-thick SCHOTT borofloat glass with a velocity of 1200 mm/s is demonstrated with 300 W of input power. Single-pass modification of 30 mm borosilicate glass is enabled with a Bessel beam at 1 kW of average power delivered by four-pulse bursts of an energy of 30 mJ.
报道了一种用于材料加工的具有灵活参数的超快掺镱薄片多程激光放大器系统。我们可以在25 kHz的重复频率下，产生由四个脉冲组成的脉冲串，脉冲间隔为20 ns，总能量为46.7 mJ。在单脉冲操作中，当优化光束质量M = 1.5时，在400 kHz下可实现1.5 kW的平均输出。以最大输出功率进行对准，在相同重复频率下可提供1.9 kW的功率。所有结果都是在多程设置中未采用啁啾脉冲放大的情况下获得的。通过探索该系统在电介质材料加工中的性能，展示了其应用潜力。使用300 W的输入功率，演示了以1200 mm/s的速度切割3.8 mm厚的肖特硼浮法玻璃。通过由能量为30 mJ的四脉冲突发提供1 kW的平均功率的贝塞尔光束，实现了30 mm硼硅酸盐玻璃的单程改性。
