Sansone G, Benedetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, De Silvestri S, Nisoli M
National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-Istituto Nazionale per la Fisica della Materia, Department of Physics, Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Science. 2006 Oct 20;314(5798):443-6. doi: 10.1126/science.1132838.
We generated single-cycle isolated attosecond pulses around approximately 36 electron volts using phase-stabilized 5-femtosecond driving pulses with a modulated polarization state. Using a complete temporal characterization technique, we demonstrated the compression of the generated pulses for as low as 130 attoseconds, corresponding to less than 1.2 optical cycles. Numerical simulations of the generation process show that the carrier-envelope phase of the attosecond pulses is stable. The availability of single-cycle isolated attosecond pulses opens the way to a new regime in ultrafast physics, in which the strong-field electron dynamics in atoms and molecules is driven by the electric field of the attosecond pulses rather than by their intensity profile.
我们使用具有调制偏振态的相位稳定的5飞秒驱动脉冲，产生了能量约为36电子伏特的单周期孤立阿秒脉冲。通过完整的时间表征技术，我们证明了所产生的脉冲可压缩至低至130阿秒，相当于不到1.2个光学周期。阿秒脉冲产生过程的数值模拟表明，阿秒脉冲的载波包络相位是稳定的。单周期孤立阿秒脉冲的可用性为超快物理开辟了一个新领域，在这个领域中，原子和分子中的强场电子动力学是由阿秒脉冲的电场驱动的，而不是由其强度分布驱动的。
