An Experimental Study of Ultrashort Pulsed Ytterbium-Doped Fibre Laser and Amplifier

We report the generation of ultrashort pulses in ytterbium-doped fibre oscillator emitting around 1.05μm at a repetition rate of 17.6 MHz. A diode laser with single silica fibre at 976nm pumps the ytterbium fibre laser, the all-fibre picosecond pulsed oscillator has excellent stability and compact size, and freedom from misalignment. After amplifying, pulse energy of 3.4 nJ and an average power of 60 m W are obtained. The compression is obtained with a grating pair out of the cavity. The compressor produces 307fs with the peak power 5.47kW. A practical fibre-based source with good performance is thus demonstrated.     

用于OPCPA展宽器的原理和优化设计

给出了一种ffner型展宽器的原理和设计,在光线追迹法的基础上用Matlab辅助程序进行了数值模拟计算,得到了影响展宽器性能参数的直观图形,并对这些参数如何影响展宽器的性能进行了分析讨论,最后给出了用于OPCPA展宽器的最优化设计参数.结果表明这种展宽器能将15 fs的脉冲展宽到900 ps.     

超短脉冲掺Yb3+光纤激光器实验研究

报道了掺Yb3+光纤激光器产生超短脉冲的实验研究超短脉冲激光器抽运源采用波长为976 nm的半导体激光器,采用非线性偏振旋转相加脉冲锁模技术,通过调节偏振控制器的方向,实现了掺Yb3+光纤激光器的稳定锁模输出,获得了最大输出功率为7.02 mW,脉冲激光光谱宽度为6 nm,重复频率为13.7 MHz.     

用于OPCPA高展宽比的展宽器

 根据öffner展宽器的原理和设计，进行了光学参量啁啾脉冲放大系统中信号光脉冲展宽的实验研究。通过数值方法，合理地选择了展宽器光学元件的各项参数，即光栅常数为1 800 (102 mm×102 mm),凹面镜曲率半径为1 000 mm,凸面镜与凹面镜之间的距离为653 mm,信号光入射角为51.05°。实验结果表明，优化后的öffner展宽器可以将脉宽为30 fs的信号光脉冲展宽到545 ps, 展宽比为18 167,满足OPCPA放大的需要。