High-beam quality, high-efficiency laser based on fiber with heavily Yb(3+)-doped phosphate core and silica cladding.
We have fabricated and tested a composite fiber with an Yb(3+)-doped phosphate glass core and silica cladding. Oscillation with a slope efficiency of 74% was achieved using core pumping at 976 nm with fiber lengths of 48-90 mm in a simple laser configuration, where the cavity was formed by a high-reflectivity Bragg grating and the cleaved fiber end. The measured M(2) factors were as low as 1.05-1.22 even though the fiber was multimode at the lasing wavelength.
O N
ON
Egorova
S L
SL
Semjonov
O I
OI
Medvedkov
M S
MS
Astapovich
A G
AG
Okhrimchuk
B I
BI
Galagan
B I
BI
Denker
S E
SE
Sverchkov
E M
EM
Dianov