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OPCPA laser systems require a high-quality, high-energy picosecond pump. The challenges of energy scaling in multi-kilohertz systems include thermal loads, depolarization and gain extraction. We address these issues for a high energy/average power MOPA System.
We report on a chirped-pulse regenerative thin-disk amplifier generating 220 mJ pulse energy at 1 kHz repetition rate with a pulse duration of 1.9 ps for pumping few-cycle optical parametric amplifiers (OPA).
An offset-free frequency comb generated by difference frequency mixing is established and characterized. mHz-level direct locking of the repetition rate to 85Rb and reference-limited linewidth narrowing via an extra-cavity electro-optic modulator are demonstrated.
We report the first ultrafast mid-infrared (IR) spectroscopy in monolayer MoS2. The observed mid-IR dynamics show multiple, yet broadened absorption, indicating the predominant intraexcitonic transition from the ground to the higher-lying excitonic states.
We demonstrate a front-end of an Yb-based passively CEP-stable, two-octave wide, two-channel optical parametric synthesizer driven by slightly sub-picosecond pump pulses from a multi-mJ regenerative amplifier at 1 kHz.
Laser damage of interference coatings is investigated with 1.6μm wavelength, 2 picosecond pulses from an optical parametric chirped pulse amplification system. 7 J/cm2 damage thresholds are achieved and deviation from conventional damage models is reported.
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