22 February 2008 Characterization of ultra-long Raman fibre lasers
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We present results on characterization of lasers with ultra-long cavity lengths up to 84km, the longest cavity ever reported. We have analyzed the mode structure, shape and width of the generated spectra, intensity fluctuations depending on length and intra-cavity power. The RF spectra exhibit an ultra-dense cavity mode structure (mode spacing is 1.2kHz for 84km), in which the width of the mode beating is proportional to the intra-cavity power while the optical spectra broaden with power according to the square-root law acquiring a specific shape with exponential wings. A model based on wave turbulence formalism has been developed to describe the observed effects.
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S. A. Babin, S. A. Babin, V. Karalekas, V. Karalekas, E. V. Podivilov, E. V. Podivilov, V. K. Mezentsev, V. K. Mezentsev, P. Harper, P. Harper, J. D. Ania-Castañón, J. D. Ania-Castañón, S. K. Turitsyn, S. K. Turitsyn, } "Characterization of ultra-long Raman fibre lasers", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731P (22 February 2008); doi: 10.1117/12.761626; https://doi.org/10.1117/12.761626

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