Laser-related Phase determination and Transfer Functions to Directly Measure Atto-and Femtosecond XUV Pulses
【摘要】：正 Under a cross correlation between ultra-short extreme ultra-violet(xuv) pulse and linearly polarized intense laser, the PID (Proportional Integral Differential) of photoelectron energy spectra excited by atto- and femtosecond xuv pulses were applied. A new method of phase determination was designed, which enabled the frequency and intensity temporal profiles of an attosecond xuv pulse to be retrieved completely and simultaneously from the Integral of the measured photoelectron energy spectrum. Another method of phase determination and a transfer function were used, allowing the intensity temporal structure of a narrow bandwidth attosecond xuv pulse to be rebuilt from a Proportional of the photoelectron energy spectrum. With the transfer functions, the intensity temporal structure of a narrow bandwidth femtosecond xuv pulse can be reconstructed from the Differential of the photoelectron energy spectrum. The proposed methods and transfer functions may be used to improve the time resolutions in measuring ultrashort xuv pulses.