Formation of flat-top picosecond pump pulses for OPCPA systems by cascade second harmonic generation

• DOI: 10.3952/physics.v52i3.2470
• Publication Date: 2012-11-09T06:49:19Z
• Authors: Jonas Adamonis; Roman Antipenkov; Jonas Kolenda; Andrejus Michailovas; Algis Petras Pisk...; Arūnas Varanavičius; Audrius Zaukevičius
• Keywords: Picosecond; Harmonic

We report on the method for picosecond pulse envelope shaping that is based temporal profile transformations during cascade second harmonic generation. It was demonstrated theoretically and experimentally under a particular generation condition, e. g. pump intensity crystal length, 1064 nm pulses with close to Gaussian one width of 75 ps at FWHM can be converted fundamental harmonics super-Gaussian having an plateau region extending over ~100 time interval when conversion efficiency in first stage generator around 45–50%. Our proposed particularly suitable application multistage OPCPA pumped by Nd:YAG laser radiation.