2005 Volume 60 Issue 7 Pages 527-534
The shortest pulse duration of an optical pulse breaks into the attosecond (1as=10-18s) region from the femtosecond (1fs=10-15s) region. Attosecond pulses are extreme ultraviolet (XUV) light and are generated through the process of high harmonics generation by nonlinear interaction between a laser electric field and atoms. Because attosecond pulses are harmonics of laser pulses, they have temporal and spatial coherence. Attosecond pulses can be applied not only to time-resolved spectroscopy but also nonlinear optics in the XUV and soft X-ray. Recently, we have succeeded in observing a nonlinear optical phenomenon in XUV and have characterized attosecond pulses with a nonlinear optical technique. In this article, the recent researches on the attosecond pulse generation and applications are described along with the details of our work.