A train of femtosecond pulses with an average power of nearly a kilowatt emitted from a fiber is now a reality, thanks to a femtosecond-fiber chirped-pulse-amplification (CPA) system created by researchers from Friedrich-Schiller-University Jena (Jena, Germany), NKT Photonics (Birkeroed, Denmark), JT Optical Engine (Jena, Germany), and the Fraunhofer Institute for Applied Optics and Precision Engineering (Jena, Germany). The device emits 640 fs pulses at a 78 MHz repetition rate and a 1040 nm center wavelength, producing a peak power of 12 MW. With such a high average power and repetition rate, the fiber CPA system is intended to replace many existing femtosecond lasers and decrease the measurement times in fundamental science experiments, or increase the processing speed in industrial applications, says Tino Eidam, one of the Friedrich-Schiller-University Jena researchers.
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