Research on High-Intensity Picosecond Pump Laser in Short Pulse Optical Parametric Amplification

A 527nm pump laser generating 1.7mJ energy with peak power of more than 0.12 GW is demonstrated.The theoretical simulation result shows that it has 106 gain in the picosecond-pump optical parametric chirped pulse amplification when the pump laser peak power is 0.1 GW and the intensity is more than 5 GW/cm2,and that it can limit the parametric fluorescence in the picosecond time scale of pump duration.The pump laser system adopts a master-oscillator power amplifier,which integrates a more than 30pJ fiber-based oscillator with a 150μJ regenerative amplifier and a relay-imaged four-pass diode-pump Nd glass amplifier to generate a 1 Hz top hat spatial beam and about 14ps temporal Guassian pulse with<2%pulse-to-pulse energy stability.The output energy of the power ampliher is limited to 4mJ for B-integral concern,and the frequency doubling efficiency can reach 65%with input intensity 10 GW/cm2.