Journal
JOURNAL OF OPTICS
Volume 17, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/17/4/045504
Keywords
mode instabilities; fiber amplifier; linearly polarized; pump wavelength
Categories
Funding
- program for the National Science Foundation of China [61322505]
- program for New Century Excellent Talents in University
- Innovation Foundation for Excellent Graduates in the National University of Defense Technology [B120704]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2012B035]
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We investigated the effect of pump wavelength on the modal instabilities (MI) in high-power linearly polarized Yb-doped fiber amplifiers. We built a novel semi-analytical model to determine the frequency coupling characteristics and power threshold of MI, which indicates promising MI suppression through pumping at an appropriate wavelength. By pumping at 915 nm, the threshold can be enhanced by a factor of 2.1 as compared to that pumped at 976 nm. Based on a high-power linearly polarized fiber amplifier platform, we studied the influence of pump wavelength experimentally. A maximal enhancement factor of 1.9 has been achieved when pumped at 915 nm, which agrees with the theoretical calculation and verified our theoretical model. Furthermore, we show that MI suppression by detuning the pump wavelength is weakened for fiber with a large core-to-cladding ratio.
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