Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106341
Title: Mode instability in a Yb-doped stretched core fiber
Authors: Xia, Nan
Yoo, Seongwoo
Keywords: Engineering::Electrical and electronic engineering
Fiber Optics Amplifiers and Oscillators
Thermal Effects
Issue Date: 2017
Source: Xia, N., & Yoo, S. (2017). Mode instability in a Yb-doped stretched core fiber. Proceedings of SPIE - Fiber Lasers XIV: Technology and Systems, 10083, 100832A-. doi:10.1117/12.2251635
Series/Report no.: Proceedings of SPIE - Fiber Lasers XIV: Technology and Systems
Abstract: In this work we present the theoretical study of transverse mode instability (TMI) in ytterbium (Yb)-doped rectangular core fibers with different core aspect ratios using the fast Fourier transform (FFT) beam propagation method (BPM). As expected, the rectangular core fiber with larger aspect ratio (AR.) offers more efficient heat dissipation than a circular core fiber. However, it is found that the rectangular core fiber does not benefit from the better heat dissipation to suppress the TMI when compared to the circular core counterpart. The temperature building in the rectangular core fiber decreases by up to 24.6% with a 10:1 aspect ratio core, while threshold pump power drops by up to 38.3% when compared with a circular core fiber with the same core area. Our study reveals that a smaller effective refractive index difference between modes and a weaker gain saturation effect compensate the thermal advantage from more efficient heat dissipation.
URI: https://hdl.handle.net/10356/106341
http://hdl.handle.net/10220/49636
ISSN: 0277-786X
DOI: 10.1117/12.2251635
Rights: © 2017 SPIE. All rights reserved. This paper was published in Proceedings of SPIE - Fiber Lasers XIV: Technology and Systems and is made available with permission of SPIE.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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