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4 March 2015 Sub-700fs pulses at 152 W average power from a Tm-doped fiber CPA system
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Abstract
Thulium-based fiber lasers potentially provide for the demand of high average-power ultrafast laser systems operating at an emission wavelength around 2 μm. In this work we use a Tm-doped photonic-crystal fiber (PCF) with a mode field diameter of 36 μm enabling high peak powers without the onset of detrimental nonlinear effects. For the first time a Tmdoped PCF amplifier allows for a pump-power limited average output power of 241 W with a slope efficiency above 50%, good beam quality and linear polarization. A record compressed average power of 152 W and a pulse peak power of more than 4 MW at sub-700 fs pulse duration are enabled by dielectric gratings with diffraction efficiencies higher than 98% leading to a total compression efficiency of more than 70%. A further increase of pulse peak power towards the GW-level is planned by employing Tm-doped large-pitch fibers with mode field diameters well above 50 μm. The coherent combination of ultrafast pulses might eventually lead to kW-level average power and multi-GW peak power.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian Gaida, Fabian Stutzki, Martin Gebhardt, Florian Jansen, Andreas Wienke, Uwe D. Zeitner, Frank Fuchs, Cesar Jauregui, Dieter Wandt, Dietmar Kracht, Jens Limpert, and Andreas Tünnermann "Sub-700fs pulses at 152 W average power from a Tm-doped fiber CPA system", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441K (4 March 2015); https://doi.org/10.1117/12.2079056
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