Development of an ultrabroad-band regenerative amplifier with a mirrorless cavity and generation of sub-20 fs pulses in terawatt regime with an adaptive phase controller

We have developed an ultrabroad-band regenerative amplifier with a mirrorless cavity to eliminate the limitation of bandwidth of dielectric coats on cavity mirrors. A large amount of material dispersion in Pellin-Broca prisms which are used instead of the cavity mirrors is compensated using a hybrid technique of Brewster prism pairs in the regenerative amplifier and an adaptive phase controller of a liquid-crystal spatial light modulator. We obtained a 16 fs pulse width with an energy of 13mJ, which was the highest energy in the sub-20 fs regime using the adaptive phase controller.