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Proceedings Paper

High average power pulsed multi-mode Raman fiber laser in graded index fiber
Author(s): Patrick Roumayah; Joshua Bradford; Justin Cook; Jose Enrique Antonio-Lopez; Rodrigo Amezcua Correa; Martin Richardson
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Paper Abstract

Raman fiber lasers have seen increased interest recently, due to their ability to access difficult wavelength ranges without the use of specially doped materials and to avoid some of the obstacles of very high power rare-earth doped fiber lasers, including modal instability and photodarkening. Though most modern works in Raman fiber lasers are based on fiber laser or direct diode pumping, solid state lasers have been developed with extremely high average powers and are readily available commercially.

This work explores a very short fiber length high average power multi-mode Raman laser system. The custom 200um graded index fiber is pumped by 30ns pulses with average powers up to 750W and pulse energies up to 7.5mJ at 1030nm, by a solid state commercial laser system. Pump-only and seeded configurations are examined. In the seeded case, higher order mode activation is demonstrated by detuning the single mode seed to preferentially feed energy to the less confined modes.

5 orders of Stokes are demonstrated, ranging from 1078nm to 1350 nm. Beam enhancement is observed by qualitative measurement of minimum beam waist, and average powers up to 70W are achieved at an energy of 1.4mJ.

Paper Details

Date Published: 26 February 2018
PDF: 9 pages
Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121X (26 February 2018);
Show Author Affiliations
Patrick Roumayah, Univ. of Central Florida (United States)
Joshua Bradford, Univ. of Central Florida (United States)
Justin Cook, Univ. of Central Florida (United States)
Jose Enrique Antonio-Lopez, Univ. of Central Florida (United States)
Rodrigo Amezcua Correa, Univ. of Central Florida (United States)
Martin Richardson, Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 10512:
Fiber Lasers XV: Technology and Systems
Ingmar Hartl; Adrian L. Carter, Editor(s)

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