The Advanced Solid State Lasers Conference (ASSL) in Boston, USA, has offered 600 attendees a comprehensive view of the latest technological advances as well as the applications of laser technologies for industrial products and markets.
Of course, scientists from our Institute could not be missed and presented their research results in this round of experts. Thereby, the work of Marco Kienel and Martin Gebhardt was awarded with an "Outstanding Oral Presentation Award" by a specialist jury, which hence honored the scientific content and the quality of the presentation.

Details of the research findings are:
The thulium-based ultra-short pulse fiber laser, newly developed at the Research Group Fiber& Waveguide Lasers, allows experiments on non-linear pulse shortening. Specifically, the pulse spectrum is broadened by propagation within a gas-filled hollow-core capillary and the laser pulse is then dispersed dispersively shorten to a few optical cycles. This concept is highly efficient like that of the fiber laser. Therefore, the combination of thulium-based fiber lasers with nonlinear compression is very well suited for the realization of intense laser pulses around 2 μm wavelength with few optical cycles and at a high repetition rate. A laser source with such characteristics is very interesting for scientific applications such as the generation of high harmonic orders of the laser frequency with a large amount of photon flux. In the compression experiment carried out, pulse compression could be realized up to 46 fs (seven optical cycles) pulse duration and 4 GW pulse peak power at 15 W average power.
Tools are established on Ytterbium-based ultra-short pulse fiber lasers in many areas of industry, medicine and science. The steady development in these areas calls for ever more powerful laser sources, which, however, are subject to physical limitations. The coherent pulse addition is a promising method to overcome these performance limits. With the pulse amplification architecture demonstrated by Marco Kienel for the first time, in which pulses are split in time and space, then amplified and subsequently coherently superimposed, pulse peak powers can now be achieved which are clearly above the existing fiber laser systems. By dividing a pulse into a pulse train consisting of four pulses and their additional splitting on eight amplifier channels, femtosecond pulses could be achieved with an average power of 700 W and pulse energies of 12 mJ, which corresponds to a pulse peak power of 35 GW. This is currently the world's most powerful ultra-shortpulse fiber laser! The concept shown is further scalable and thus opens the way for even more powerful laser systems in the near future.

Martin Gebhardt at the new laboratory in the ACP building. He researches on thulium-based ultra-short lasers. [J. Kasper, FSU]
News from: 09.12.2016 13:56
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