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22 March 2013 Peak power scaling in Tm doped fiber lasers to MW-level
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In this manuscript we present our recent achievements utilizing thulium-doped photonic crystal fiber rods (PCF-rods) for lasing at 2 μm wavelength and their potential as high peak power amplifiers. Two PCF-rods with 65 μm and 80 μm core diameter were first separately characterized in CW laser oscillators. The rods were pumped with a 793 nm laser diode and produced more than 18 W output power with near diffraction limited beam quality and a slope efficiency of up to 27.8 %. Implementing an intracavity high reflectivity grating for lasing wavelength selection enabled a tuning range of 180 nm from 1810 nm to 1990 nm. Thereafter the PCF-rod with 80 μm core was used as an amplifier and produced similar output powers when seeded with up to 4 W at 1960 nm from a master oscillator power amplifier (MOPA). The slope efficiency in this case was reduced to 20.1 % mainly due to the center wavelength of 1960nm. We are in the process of characterizing these rods in a pulsed amplification configuration to surpass MW-level peak power with multi-mJ pulse energy.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian Gaida, Martin Gebhardt, Pankaj Kadwani, Lasse Leick, Jes Broeng, Lawrence Shah, and Martin Richardson "Peak power scaling in Tm doped fiber lasers to MW-level ", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86012Y (22 March 2013);

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