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

Keywords:

V.E. Ustimchik – Ph.D. (Phys.-Math.), Junior Research Scientist, Kotelnikov IRE RAS (Moscow). E-mail: ustimchikv@gmail.com 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.
References:

 

  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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