Radiation properties of high-order harmonic generation for the measurements of femto-and attosecond X-ray pulses

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2009,（13）
• 页码范围: 2205-2216
• 页数: 12页
• 语种: 英文
• DOI: 10.1007/s11434-009-0397-7

摘要

Radiation properties of high-order harmonic generation (HHG) are calculated for atoms in a strong laser field.The laser-duration dependence and the carrier-envelope-phase (CEP) dependence of HHG radiation properties are presented.The CEP dependence of the pure single distribution pulse of HHG radiation properties shows interesting 180°periodic structures.The quantum enhancement of the laser-assisted photo-ionization by femtosecond (1 fs=10-15 s) and attosecond (1 as=10-18 s) X-ray pulses and the interference patterns of photo-electron energy spectra are theoretically investigated.Transfer equations are presented for pulse reconstructions.The theoretical root-mean-square time (energy) differences of attosecond pulse reconstructions with different durations are less than 2 as (0.8 eV).These methods may be developed as basic techniques to access ultra-fast measurements and molecular movie.