11 March 2014 Photonic crystal fiber pump combiner for high-peak power all-fiber thulium lasers
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Abstract
We report on the performance of a prototype pump combiner for use with thulium-doped photonic crystal fiber (PCF). This platform is attractive for “all-fiber” high energy and high peak power laser sources at 2 μm. We will report on the performance of this integrated amplifier in comparison to free space amplification in Tm:PCF. In particular, we carefully look for spectral/temporal modulation resulting from multimode interference between fundamental and higher order transverse modes in the amplifier to evaluate this for ultrashort chirped pulse amplification. The slope efficiency for the all-fiber amplifier is 22.1 %, indicating the need for further improvement. However, an M2 < 1.07 demonstrates excellent beam quality, as well as amplified polarization extinction ratios of ~25 dB.
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Alex Sincore, Jason Tafoya, Donald Sipes, Lasse Leick, Lawrence Shah, Martin Richardson, "Photonic crystal fiber pump combiner for high-peak power all-fiber thulium lasers", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896133 (11 March 2014); doi: 10.1117/12.2041327; https://doi.org/10.1117/12.2041327
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