Self-compression of 2 μm laser filaments
Self-compression of 2 μm laser filaments
复制标题
DOI：
10.1364/oe.16.021529
复制
发表时间：
2008-12
期刊：
影响因子：
3.8
通讯作者：
L. Bergé
中科院分区：
文献类型：
--
作者：
L. Bergé
我们数值研究了2µm载流子波长的超短激光脉冲在惰性气体(Ar、Xe)和空气中的成丝过程。与近可见光区(800 Nm)的成丝相比，一般可以在自聚焦阈值附近以不同的压力和功率产生持续时间接近单个周期的中红外光源。产生自压缩的机制主要包括光学自聚焦、脉冲陡化和等离子体散焦。讨论了轴上光谱和光谱相位。传输长波长的单周期脉冲在产生高次谐波和孤立的阿秒脉冲方面有着重要的应用。
We numerically study the filamentation of ultrashort laser pulses at 2 µm carrier wavelength in noble gases (argon, xenon) and in air. Compared with filamentation in the near-visible domain (800 nm), mid-infrared optical sources with durations close to a single cycle can be generically produced at various pressures and powers near the self-focusing threshold. The mechanism by which self-compression takes place mainly involves optical self-focusing, pulse steepening and plasma defocusing. On-axis spectra and spectral phases are discussed. Delivering single-cycled pulses at long wavelengths has important applications in the generation of high-order harmonics and isolated attosecond pulses.