论文标题
微型joule级的测量，几秒紫外的紫外线脉冲
Measurements of microjoule-level, few-femtosecond ultraviolet dispersive-wave pulses generated in gas-filled hollow capillary fibers
论文作者
论文摘要
通过分散波排放过程中充气的空心毛细血管纤维（HCFS）中的高能紫外线脉冲产生，由于其在紫外线光谱和光化学方面的巨大应用潜力，近几年来吸引了相当大的关注。尽管该技术传递高能量，超快紫外脉冲的能力得到了广泛认可，但是μJ级级色散波（DW）脉冲的持续时间很少，但是却逃脱了直接测量。在这封信中，我们证明了使用几个the鼠的镜子，在大气环境中无需使用真空室即可在大气环境中获得很少的紫外DW脉冲。脉冲时间曲线使用自分配频率分辨的光门控设置测量，在384 nm处显示了9.6 fs的全宽度最大脉冲宽度，在430 nm处显示为9.4 fs，靠近傅立叶转换限制。此外，理论和实验研究揭示了驱动脉冲能量和HCF长度对测得的DW脉冲的时间宽度和形状的强烈影响。在大气环境中获得的紫外脉冲，μJ级脉冲能，几个FS脉冲宽度和宽带波长可调性已准备好在许多应用中使用。
High-energy ultraviolet pulse generation in gas-filled hollow capillary fibers (HCFs) through dispersive-wave-emission process, has attracted considerable attentions in recent several years due to its great application potentials in ultraviolet spectroscopy and photochemistry. While the ability of this technique to deliver high-energy, ultrafast ultraviolet pulses is widely recognized, few-fs duration of μJ-level dispersive-wave (DW) pulses has, however, escaped direct measurements. In this letter, we demonstrate that using several chirped mirrors, few-fs ultraviolet DW pulses can be obtained in atmosphere environment without the use of vacuum chambers. The pulse temporal profiles, measured using a self-diffraction frequency-resolved optical gating set-up, exhibit full-width-half-maximum pulse widths of 9.6 fs at 384 nm and 9.4 fs at 430 nm, close to the Fourier-transform limits. Moreover, theoretical and experimental studies reveal the strong influences of driving pulse energy and HCF length on temporal width and shape of the measured DW pulses. The ultraviolet pulses obtained in atmosphere environment with μJ-level pulse energy, few-fs pulse width and broadband wavelength tunability are ready to be used in many applications.
