title: Nearly single-mode Raman lasing at 954  nm in a graded-index fiber directly pumped by a multimode laser diode.
abstract: High beam quality and narrow spectrum have been obtained in a Raman fiber laser based on a 1.1 km long graded-index fiber directly pumped by a multimode 915 nm laser diode. The generation of a near-diffraction-limited beam at 954 nm with M2≤1.27 and Δλ=0.42  nm at an output power above 10 W is enabled by a cavity mirror made of a special fiber Bragg grating inscribed by a femtosecond technique in the central part of the graded-index fiber core.
authors.forename: E A
authors.initials: EA
authors.lastname: Zlobina
authors.forename: S I
authors.initials: SI
authors.lastname: Kablukov
authors.forename: A A
authors.initials: AA
authors.lastname: Wolf
authors.forename: A V
authors.initials: AV
authors.lastname: Dostovalov
authors.forename: S A
authors.initials: SA
authors.lastname: Babin