Wang Yanjing, Zhang Xin, Tong Cunzhu, Wang Lijie, Shu Shili, Tian Sicong, Wang Lijun
Opt Express. 2020 Mar 2;28(5):7108-7115. doi: 10.1364/OE.385576.
High power femtosecond semiconductor laser based on saw-toothed taper mode-locked laser and amplifier was demonstrated with compressed amplified spontaneous emission (ASE). The external-cavity mode-locked taper laser generated the clean optical pulses without any sub-pulse components. A semiconductor optical amplifier (SOA) with tilted taper waveguide and saw-toothed edge reduced evidently the ASE background. The saw-tooth microstructures were optimized and it was found that the saw-tooth of right-right angled triangle showed the best effect. The ratio of the maximum intensity to background radiation was increased by 21.9% and the power was increased by 30.5% due to the saw-tooth microstructure in the SOA. The pulse duration of 495 fs and a peak power over 1.5 kW with repetition rate of 579 MHz were realized after a double-pass grating compressor.
基于锯齿形锥形锁模激光器和放大器的高功率飞秒半导体激光器，通过压缩放大自发辐射（ASE）得以实现。外腔锁模锥形激光器产生了没有任何子脉冲成分的纯净光脉冲。具有倾斜锥形波导和锯齿边缘的半导体光放大器（SOA）显著降低了ASE背景。对锯齿微结构进行了优化，发现直角三角形的锯齿效果最佳。由于SOA中的锯齿微结构，最大强度与背景辐射的比率提高了21.9%，功率提高了30.5%。经过双程光栅压缩器后，实现了495 fs的脉冲持续时间、超过1.5 kW的峰值功率以及579 MHz的重复频率。
