Large mode area double clad ytterbium tapered fiber with circular birefringency

Rissanen, Joona; Fedotov, A. B.; Noronen, Teppo; Gumenyuk, Regina; Chamorovskiy, Yuri K.; Kolosovskii, Alexander; Voloshin, V. V.; Vorob'ev, Igor' L; Odnoblyudov, M. A.; Филиппов, В. Н.

doi:10.1117/12.2508811

Fiber Lasers XVI: Technology and Systems 2019

DOI: 10.1117/12.2508811

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Large mode area double clad ytterbium tapered fiber with circular birefringency

Joona Rissanen¹,

A. B. Fedotov²,

Teppo Noronen³

et al.

Abstract: 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 (M 2 =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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Cited by 2 publications

References 12 publications

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Large mode area double-clad ytterbium-doped spun tapered fiber

Fedotov

Ustimchik²,

Rissanen³

et al. 2021

J. Opt. Soc. Am. B

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We performed a comparative study of Yb-doped double-clad large mode area ( M F D = 31 µ m ) spun tapered fibers with different pitch lengths. A novel type of spun tapered fibers with constant pitch lengths of 7.5, 15, and 30 mm, internal birefringence as low as ∼ 10 − 8 , and perfect output beam quality ( M 2 <2021

J. Opt. Soc. Am. B

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Photonics

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Thanks to the advantage of balancing nonlinear effects and transverse mode instability, vary core diameter active fiber (VCAF) has been widely used in high power ytterbium-doped fiber lasers in recent years. Up to now, VCAF has developed from the basic form of the original tapered fiber to the spindle-shaped and saddle-shaped fiber with different characteristics and has been applied in conventional fiber lasers, oscillating–amplifying integrated fiber lasers, and quasi-continuous wave fiber lasers and successfully improved the performance of these lasers. In the present study, a 6110 W fiber laser amplifier is realized based on a tapered fiber. The maximum output power of a fiber laser amplifier based on spindle-shaped fibers is 6020 W with a beam quality of M2~1.86. In this paper, we first introduce the basic concept of VCAF and summarize its main fabrication methods and advantages in high-power fiber laser applications. Then, we will present the recent research results of high-power fiber laser employing VCAF in our group and clarify the outstanding advantages of VCAF compared with the constant core diameter active fiber (CCAF).

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Large mode area double clad ytterbium tapered fiber with circular birefringency

Cited by 2 publications

References 12 publications

Large mode area double-clad ytterbium-doped spun tapered fiber

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