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Proceedings Paper

Generation of picosecond pulses with 150 W of average and 0.92 MW of peak power from an Yb-doped tapered fiber MOPA
Author(s): Konstantin K. Bobkov; Andrey E. Levchenko; Tatiana A. Kochergina; Svetlana S. Aleshkina; Mikhail M. Bubnov; Denis S. Lipatov; Aleksandr Yu. Laptev; Alexey N. Guryanov; Mikhail E. Likhachev
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Paper Abstract

In this paper, we demonstrate possibility of simultaneous achievement of high peak and high average power in picosecond pulses using a monolithic amplifier based on a long Yb-doped tapered fiber. Due to a very high pump absorption (~ 25 dB/m at 976 nm) in the realized 2.4 m long tapered fiber most of the pump is absorbed near the thick tapered fiber end and a very small fraction of pump power reaches thin fiber end. As a result, signal passes through the thin part of the tapered fiber without an amplification and exhibits fast growth only near the output tapered fiber end, where a mode field diameter is large (35 μm at 1064 nm for 46 μm output core diameter), so that pulses can be amplified to a high peak power. Moreover, only a negligible fraction of pump radiation leaks at the conic part of the tapered fiber, because its most part was absorbed in the thick tapered fiber part. Thus a safe operation without polymer burning at a leakage point is possible up to a very high pump power. The developed tapered fiber was used in a final amplification stage of the all-fiber pulsed laser system, which allowed us to amplify 8.3 ps pulses with repetition rate of 18.4 MHz and central wavelength of 1064 nm to 150 W of average power and 0.92 MW peak power. The average power level was limited only by available pump power (230 W): no signs of transverse mode instability effects were observed.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126020 (21 February 2020); doi: 10.1117/12.2546650
Show Author Affiliations
Konstantin K. Bobkov, Fiber Optics Research Ctr. (Russian Federation)
Andrey E. Levchenko, Fiber Optics Research Ctr. (Russian Federation)
Tatiana A. Kochergina, Fiber Optics Research Ctr. (Russian Federation)
Svetlana S. Aleshkina, Fiber Optics Research Ctr. (Russian Federation)
Mikhail M. Bubnov, Fiber Optics Research Ctr. (Russian Federation)
Denis S. Lipatov, G. G. Devyatykh Institute of Chemistry of High-Purity Substances (Russian Federation)
Aleksandr Yu. Laptev, G. G. Devyatykh Institute of Chemistry of High-Purity Substances (Russian Federation)
Alexey N. Guryanov, G. G. Devyatykh Institute of Chemistry of High-Purity Substances (Russian Federation)
Mikhail E. Likhachev, Fiber Optics Research Ctr. (Russian Federation)


Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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