a) The parameters of the OPCPA are specified below.

• Pulse repetition rate frequency 0.1-1 MHz variable (nominal 0.1 MHz)
• Average optical output power >1.5 W compressed
• Pulse duration 15 fs compressed or negatively stretched to 0.7-1.5 ps for further amplification
• Compressed pulses have no pedestal, satellite pulses <10%
• Pulse energy >15 µ J at 0.1 MHz or >1.5 µ J at 1 MHz
• Energy stability <1% rms
• Beam pointing <10% of beam divergence• Center wavelength out of laser amplifier 780 nm (nominal)
• Spectral range 0.7-1 µm
• Spectral bandwidth transform limited, no ripples, no pedestals,
• Collimated free space output, M2 <1.3
• Polarization extinction ratio >30 dB, fixed in direction
• Ellipticity >0.85
• Negligible optical parametric fluorescence background
• Pulse contrast 10-7 at >10 ps, 10-6 at >1 ps
• Long-term stability for 24/7 operation.

b) The OPCPA is seeded with a white-light continuum, generated with a fraction of the 1030 nm fiber amplifier system (3 µJ pulse energy. This corresponds to 0.3 and 3 W for 0.1 and 1 MHz, respectively).

c) The OPCPA seed pulses are stretched using a negative or positive dispersion stretcher which allows to select and/or manipulate spectral components in the Fourier domain.

d) The seed pulse repetition rate is tunable between 0.1-1 MHz

e) The OPCPA is pumped by the remaining >27 W average power beam, further referred to as fundamental pump beam.

f) The fundamental pump beam is frequency doubled to generate the OPCPA pump with a conversion efficiency of >50%.

g) The OPCPA output pulses are either stretched to 70% of the Yb:YAG main amplifier pulse duration (pump pulse duration of 1-2 ps nominal at FWHM) or compressed to <15 fs pulse duration.

h) The OPCPA setup includes a set of optics and optomechanical components to realize a passive CEP stable mid-IR OPCPA.

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