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Investigation of impact of longitudinal geometric profile of active optical fiber on mode instability occurrence


V.E. Ustimchik – Ph.D. (Phys.-Math.), Junior Research Scientist, Kotelnikov IRE RAS (Moscow). E-mail: Yu.K. Chamorovskii – Ph.D. (Phys.-Math.), Leading Research Scientist, Kotelnikov IRE RAS (Moscow) V.N. Filippov – Ph.D. (Phys.-Math.), Research Scientist, Optoelectronic Research Center, Tampere University of Technology (Finland) K.M. Golant – Dr.Sc. (Phys.-Math.), Senior Research Scientist, Kotelnikov IRE RAS (Moscow) S.A. Nikitov – Dr.Sc. (Phys.-Math.), Director, Head of Laboratory, Kotelnikov IRE RAS (Moscow)

We consider mode instability in both irregular tapered and regular cylindrical double-clad Yb-doped optical fibers. Appearance of mode instability was investigated experimentally in linear CW-laser scheme based on each type of fibers. Comparison of experimental results shows that mode instability occurs with much less output power in regular fibers.


  1. Jauregui C. et al. Impact of modal interference on the beam quality of high-power fiber amplifiers // Opt. Express. 2011. № 19 (4). P. 3258.
  2. Smith A.V., Smith J.J. Mode instability in high power fiber amplifiers // Opt. Express. 2011. № 19 (11). P. 10180.
  3. Kerttula J., Filippov V., Ustimchik V., Chamorovskiy Y., Okhotnikov O.G. Mode evolution in long tapered fibers with high tapering ratio // Opt. Express. 2012. № 20. P. 25461–25470.
  4. Kerttula J., Filippov V., Chamorovskii Y., Ustimchik V., Golant K., Okhotnikov O.G. Principles and performance of tapered fiber lasers: from uniform to flared geometry // Appl. Opt. 2012. № 51. P. 7025–7038.


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