Most time resolved studies to date have made use of readily available visible and near-visible pump sources to trigger the
It is therefore necessary to have light sources over broad range of frequencies. Particularly important is obtaining pump pulses in the frequency range from 1 to 20 THz that are 1) narrow band and tunable with the relative bandwidth of the order of 1% and the peak electric field of the order 100 kV/cm; 2) broad band and near-half-cycle with the peak electric field larger than 1MV/cm.
We propose a workshop to discuss various ideas that could help to build tunable THz sources satisfying above stated requirements. It is presumed that these sources should work in tandem with a free-electron laser or a storage ring based synchrotron light source producing x-ray probe pulse. Thus, synchronization between THz pulse and the x-ray pulse with a picosecond level accuracy is essential. It is also desirable to match the repetition rate of THz pulse with a repetition rate of x-ray pulses that in the case of a storage ring base light source is of the order of few MHz