Large-mode-area double clad ytterbium-doped tapered fiber with circular birefringence

Rissanen, Joona; Fedotov, Andrei; Noronen, Teppo; Gumenyuk, Regina; Chamorovskii, Yuri; Kolosovskii, Alexander; Voloshin, Victor; Vorobev, Igor; Odnoblyudov, Maxim; Filippov, Valery (2019-03-07)
 
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Rissanen, Joona
Fedotov, Andrei
Noronen, Teppo
Gumenyuk, Regina
Chamorovskii, Yuri
Kolosovskii, Alexander
Voloshin, Victor
Vorobev, Igor
Odnoblyudov, Maxim
Filippov, Valery
07.03.2019

1089725
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doi:10.1117/12.2508811
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https://urn.fi/URN:NBN:fi:tty-201903291360

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We demonstrated, for the first time to our best knowledge, an active tapered double clad fiber with circular birefringence and 35 μm core diameter. The output radiation had perfect beam quality (M2=1.18/1.1) and linearly polarized light with 15 dB of PER. The developed double clad active fiber was investigated for amplification of picosecond pulses in allfiber MOPA system. The MOPA system delivered 50 ps pulses with 55 W of the average power revealed 34.4 dB gain of the booster amplifier.
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