Mashiko Hiroki, Gilbertson Steve, Li Chengquan, Khan Sabih D, Shakya Mahendra M, Moon Eric, Chang Zenghu
J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.
Phys Rev Lett. 2008 Mar 14;100(10):103906. doi: 10.1103/PhysRevLett.100.103906.
We demonstrated a novel optical switch to control the high-order harmonic generation process so that single attosecond pulses can be generated with multiple-cycle pulses. The technique combines two powerful optical gating methods: polarization gating and two-color gating. An extreme ultraviolet supercontinuum supporting 130 as was generated with neon gas using 9 fs laser pulses. We discovered a unique dependence of the harmonic spectra on the carrier-envelope phase of the laser fields, which repeats every 2 pi radians.
我们展示了一种新型光开关，用于控制高次谐波产生过程，从而能够利用多周期脉冲产生单个阿秒脉冲。该技术结合了两种强大的光学选通方法：偏振选通和双色选通。使用9飞秒激光脉冲，利用氖气产生了支持130阿秒的极紫外超连续谱。我们发现谐波谱对激光场的载波包络相位具有独特的依赖性，这种依赖性每2π弧度重复一次。
