Sub-femtosecond pulse generation and its control

The generation of sub-femtosecond pulses will extend the horizon of ultrafast measurements to the time scale of electronic motions and allow us an exciting new view on nature. On the basis of molecular modulation we have developed a series of novel techniques for sub-fs pulse generation and control. Seeded amplification of colored conical emission and two-dimensional multicolored transverse arrays as well as simultaneously up-converted parametric amplification have been demonstrated using spectral synthesis to obtain sub-fs pulses. High harmonic generation and its output coupling from enhancement cavities with high repetition rate femtosecond pulse trains from oscillators have been investigated.