Abstract

We demonstrate a compact $20\mathrm{Hz}$ repetition-rate mid-IR OPCPA system operating at a central wavelength of $3900\mathrm{nm}$ with the tail-to-tail spectrum extending over $600\mathrm{nm}$ and delivering $8\mathrm{mJ}$ pulses that are compressed to $83\mathrm{fs}$ ($<7$ optical cycles). Because of the long optical period ($\sim 13\mathrm{fs}$) and a high peak power, the system opens a range of unprecedented opportunities for tabletop ultrafast science and is particularly attractive as a driver for a highly efficient generation of ultrafast coherent x-ray continua for biomolecular and element specific imaging.

© 2011 Optical Society of America

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