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Femto second laser is based on chirping technology. The basic principle is to expend the strong laser field before amplication in case it may destroy optics. After that, beam compressor is used to compress the beam duration so that you can get a pulse with fs width. That is how one can get extremely strong laser field. The strongest fs laser I had seen recently is the VOLCAN laser system in Oxford. The power desity is about 10^18 Watts/cm^2/s |