270-km ultralong Raman fiber laser.

Phys Rev Lett

Photonics Research Group, Aston University, Birmingham, B4 7ET, United Kingdom.

Published: September 2009

We analyze the physical mechanisms limiting optical fiber resonator length and report on the longest ever laser cavity, reaching 270 km, which shows a clearly resolvable mode structure with a width of approximately 120 Hz and peak separation of approximately 380 Hz in the radio-frequency spectrum.

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Source
http://dx.doi.org/10.1103/PhysRevLett.103.133901DOI Listing

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