High energy two cycle pulses at 3 2 m m by a broadband pumped dual chirped optical parametric amplification
A design for efficient generation of mid infrared pulses at 3.2 mm is presented, which is based on numerical simulations of the broadband pumped dual chirped optical parametric amplification (DC OPA) in LiNbO3 doped with 5 mol. MgO (MgO:LiNbO3) The broadband seed can be generated by difference frequency generation in KTA using spectrally broadened Ti:Sapphire lasers. The broad DC OPA phase matching bandwidth spanning from 2.4 mm to 4.0 mm is achieved by chirping both the broadband Ti:Sapphire pump pulses and the seed pulses in such a way that the individual temporal slice of pump spectrum is able to phase match that of seed spectrum. This phase matching scheme allows the use of longer crystals without gain narrowing or loss of conversion efficiency. The theoretical conversion efficiency from the pump to the idler reaches 19.1 enabling generation of a few hundred mJ of mid IR energy with an available large aperture MgO:LiNbO3 crystal. 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