Versatile, compact chirped pulse amplifier pump system for ultrafast optical parametric amplifiers

We report on the development of a pump system for ultrafast optical parametric amplifiers (uOPA) as an upgrade for the existing uOPA at the Petawatt High Energy Laser for heavy Ion eXperiments (PHELIX) and the new Petawatt ENergy-Efficient Laser for Optical Plasma Experiments (PENELOPE). The system consists of a two-stage chirped pulse amplifier, centered around a high energy Yb:YAG regenerative amplifier that delivers 108 mJ uncompressed output energy, resulting in 92 mJ at 1030 nm after compression, pulse durations of 1.4 ps, a high beam quality of M2x/y = 1.02 / 1.16 and a relative energy stability of 0.35 %. A second harmonic generation (SHG) efficiency of up to 70 % is achievable and a maximum pulse energy of 43 mJ at 515 nm has been obtained, which is only limited by the damage threshold of the SHG crystal. A self-phase modulation stage makes this system a widely applicable, self-seedable pump module for uOPA without placing strong requirements on its seed oscillator.

Automated summary

We have developed a pump system for ultrafast optical parametric amplifiers (uOPA) as an upgrade for existing uOPA at PHELIX and the new PENELOPE. The system consists of a two-stage chirped pulse amplifier, centered around a high energy Yb:YAG regenerative amplifier, with high beam quality and relative energy stability. It achieves efficient second harmonic generation and a high pulse energy at 515 nm. It is a widely applicable and self-seedable pump module for uOPA.