Powerful femtosecond pulse generation by chirped and stretched pulse parametric amplification in BBO crystal

Chirped pulses have been parametrically amplified by a factor of ∼2×104 without bandwidth limitation in BBO crystal. Pulses were compressed down to 70 fs, and ∼0.9 GW output power has been obtained. A special technique to match temporal profiles of signal and pump pulses was used.