Lately we have succeeded in constructing a 100 picoseconds dye laser that is pumped by an 800 picoseconds nitrogen laser. This dye laser exploits the controlled resonator transients and combines two amplifier stages. The output pulse duration is compressed significantly from the pump pulse and can be varied by the cascade pumping and by changing the cavity photon lifetime. Both the temporal and the spectral characteristics of the short dye pulse were measured to be consistent with and complementary to each other.