Abstract
We report on 3.2 μm pulse post-compression via spectral broadening in hollow core capillary filled with noble gas. The mid-IR input pulses are generated in a femtosecond OPA based on KTA crystals, which delivers 6 mJ, 80 fs, 3.2 μm CEP-stable idler pulses. Pulses were spectrally broadened in a 3 meter long differentially pumped hollow-core capillary with ~50% transmission and a statically filled 50 cm capillary. The spectrally broadened pulses were compressed in a CaF2 bulk material down to 31 fs and pulse bandwidth supporting Fourier-limited pulse duration below 15 fs were obtained, which corresponds to sub-two cycle pulse at this wavelength.
© 2016 Optical Society of America
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