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Long period fiber gratings for the mitigation of parasitic laser effects in mid-infrared fiber amplifiers

: Heck, M.; Gauthier, J.-C.; Tünnermann, A.; Vallee, R.; Nolte, S.; Bernier, M.

Volltext ()

Optics Express 27 (2019), Nr.15, S.21347-21357
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

A concept to mitigate parasitic lasing in mid-IR fiber amplifiers using a single long period fiber grating is shown. Using tightly confined ultrashort laser pulses at 800 nm, a grating was directly inscribed into the core of an erbium doped fluoride glass fiber showing a strong attenuation down to −27 dB at desired wavelength. The concept reveals great potential to improve the average output power and attainable spectral range of low repetition rate in-amplifier supercontinuum generation.