Germany Jena University Team to Refresh Ultra-fast Laser Pulse Power World Record
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Thu Oct 13, 2016 7:31 pm
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Researchers at the University of Jena in Germany, together with the European ELI (Extreme Light Infrastructure) project, set a world record by providing a laser system capable of delivering up to 6 femtoseconds and 200 W of burning laser pointer power, in order to develop new sources of high repetition rate ultrashort pulses. The team is composed of researchers from organizations such as Fredrik Schiller University in Germany, Fraunhofer Institute for Applied Optics and Precision Engineering, and Active Fiber Systems.
The laser system is based on a femtosecond fiber laser with two nonlinear compression stages. The pump source consists of an optical fiber chirped pulse amplification (FCPA) system with a coherent synthesis system consisting of up to eight main amplifier channels. In the first test, the system runs at 1.27MHz, providing 660W power. The final specification will be 100 kHz and 100W. As for the two non-linear compression stages, the first stage provides about 30 femtoseconds of pulses with 408 W of power (corresponding to 320 μJ of pulse energy). After the second stage and the subsequent compression, the final realization of the 208W, 6.3 femtosecond pulse. Specific results have been published in the field of optical journals on the famous Optics Letters.
Next Steps: 24/7 user facilities. The Jena University team is currently developing a new laser system for ELI-ALPS in Szeged, Hungary. The results are mainly from the first development stage of high-repetitive ALPS light sources. The target size is 1 mJ at 100 kHz repetition rate, and the pulse length should be maintained at about 6 femtoseconds. Based on the latest laboratory developments, the German Jena University team is confident that in February 2017 the 3000mw laser pointer system will be available with these specifications. Although the current specifications have been refreshed records, but the final version of Segund will be more powerful. In the second stage, the system will be upgraded to a higher energy of 5 mJ, thus building a high repetition rate of the sub-second pulse. Researchers will track these electrons in real time based on these pulses, leading to significant advances in new areas of atomic and molecular physics, solid-state physics, and plasma optics.
ELI has received funding from the European Regional Development Fund (ERDF) of more than 850 million euros and has independent research institutes in the Czech Republic, Hungary and Romania.