系统研究了利用充惰性气体的250 μm内径的空心光纤(HCF)展宽光谱和啁啾镜补偿色散的高能量周期量级脉冲压缩技术。基于此技术,研究了入射激光脉冲能量和腔内惰性气体气压对于压缩后脉冲宽度和输出能量的影响。将钛宝石激光器输出的脉冲宽度40 fs,单脉冲能量2.7 mJ,重复频率1 kHz,中心波长在800 nm的激光脉冲输入压缩系统,获得了脉冲宽度7 fs,单脉冲能量大于1 mJ,中心波长为750 nm的稳定周期量级激光脉冲。

The intense few-cycle pulse compression technique based on 250-μm-inner-diameter single fused-silica hollow-core fiber (HCF) and subsequent negative dispersive compression stage by chirped mirrors is researched systemicly. Using the system,we study the influence of parameters like input pulse energy and gas pressure to the final duration and output energy of the compressed pulse. On this basis,7 fs compressed pulses with energy of more than 1 mJ and centre wavelength of 750 nm are obtained through this Ne-filled HCF system,and the driving source is from a 1-kHz Ti:sapphire laser generating 2.7 mJ driving pulses centered at 800 nm with 40 fs duration.