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We report on the design and performance of a Yb:CaF2 booster with a pass-by-pass compensated spatial gain narrowing. A 5-concave-mirror design affords a flexible number of passes as well as 4f image relay and progressive beam magnification onto the laser crystal.
The gain bandwidth of Ho-doped crystals is sufficiently broad to support femtosecond operation, which would allow pumping of ultrashort-pulse mid-IR optical parametric amplifiers (OPAs) [1,2] and, upon reaching adequate peak powers, eye-safe filamentation in the >2-μm transparency window of the atmosphere. In this contribution, we report on, to our knowledge, the first demonstration of a femtosecond...
We demonstrate a compact 20-Hz-repetition-rate mid-IR OPCPA for application in high-field science which operates at 3900 nm with a FWHM bandwidth of 600 nm delivering 6-mJ pulses compressed to 75±10 fs (< 6 optical cycles).
We implement a novel parametric waveform synthesizer based on three carrier-envelope-phase-locked femtosecond pulses with tunable commensurate/-incommensurate carrier-frequencies. Directional electron emission asymmetry in such light-fields is shown to cause the generation of tunable Brunel-type sideband radiation.
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