Optimum chirp for efficient terahertz generation from two-color femtosecond pulses in air
Optimum chirp for efficient terahertz generation from two-color femtosecond pulses in air
复制标题
通过空气中的双色飞秒脉冲高效生成太赫兹的最佳线性调频脉冲
DOI：
10.1063/1.5053893
复制
发表时间：
2018-12-10
影响因子：
4
通讯作者：
Savel'ev, A.
中科院分区：
文献类型：
--
作者：
Zhang, Zhen;Panov, N.;Savel'ev, A.
我们将详细的时空传播模拟与单丝在双色光激发下产生太赫兹（THz）脉冲的实验进行了比较，从而阐明了正啁啾光脉冲导致最大太赫兹产量的机制。正啁啾2 ω脉冲前缘的长波分量保持了与ω脉冲的重叠。太赫兹产率对时间重叠极为敏感：对于35fs的x脉冲，当ω -2 ω脉冲位移仅为5fs时，产率就会下降一个数量级。AIP出版社出版。
We compare detailed spatio-temporal propagation simulations with experiments on generation of terahertz (THz) pulses in single filaments with two-color optical excitation, which elucidates the mechanism whereby positively chirped optical pulses lead to the maximum THz yield. The long-wavelength components in the leading edge of the positively chirped 2 omega-pulse preserve the overlap with the omega-pulse. The THz yield is extremely sensitive to the temporal overlap: for a 35-fs x-pulse, the yield decreases by an order of magnitude upon a omega-2 omega pulse shift of only 5 fs. Published by AIP Publishing.