Hong Weiyi, Wei Pengfei, Zhang Qingbin, Wang Shaoyi, Lu Peixiang
1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Opt Express. 2010 May 24;18(11):11308-15. doi: 10.1364/OE.18.011308.
We propose a method to control the harmonic process by a mid-IR modulated polarization gating for the effective generation of an ultra-broadband supercontinuum in the neutral rare-gas media. Using a mid-IR polarization gating pulse modulated by a weaker 800-nm linearly polarized pulse, the ionization, acceleration and recombination steps in the harmonic process are simultaneously controlled, leading to the efficient generation of an ultra-broadband supercontinuum covered by the spectral range from ultraviolet to water window x ray under the low ionization rate. The right phase-matching technique is employed to macroscopically select the short quantum path of the supercontinuum, then isolated sub-100-as pulses with tunable wavelengths are directly obtained. This supercontinuum also supports the pulse duration far below one atomic unit of time.
我们提出了一种通过中红外调制偏振门控来控制谐波过程的方法，以便在中性稀有气体介质中有效地产生超宽带超连续谱。利用由较弱的800纳米线偏振脉冲调制的中红外偏振门控脉冲，谐波过程中的电离、加速和复合步骤可同时得到控制，从而在低电离率下高效产生覆盖从紫外到水窗X射线光谱范围的超宽带超连续谱。采用正确的相位匹配技术从宏观上选择超连续谱的短量子路径，进而直接获得波长可调的亚100阿秒孤立脉冲。这种超连续谱还支持远低于一个原子时间单位的脉冲持续时间。
