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Opt Lett. 2007 May 1;32(9):1135-7.

Experimental demonstration of mode structure in ultralong Raman fiber lasers.

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  • 1Institute of Automation and Electrometry, Novosibirsk, Russia.


We present the first experimental demonstration of a resolvable mode structure with spacing c/2nL in the RF spectra of ultralong Raman fiber lasers. The longest ever demonstrated laser cavity (L=84 km), RF peaks of ~100 Hz width and spacing ~1 kHz have been observed at low intracavity powers. The width of the peaks increases linearly with growing intracavity power and is almost independent of fiber length.

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