Electrodynamic approach to the estimate of the pumping efficiency of double cladding active optical fibres

Britov, I E; Kurkov, Andrei S; Raevskii, A. S.

doi:10.1070/qe2002v032n05abeh002210

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“…The concentration of GeO 2 in the inner cladding was approximately 10 mol%, providing an NA of 0.22 for the pump emission. It should be noted that in the case of relatively small inner cladding, efficient coupling of the cladding modes with the core takes place without the application of a non-circular geometry of the cladding [20].…”

Section: Wavelength Nmmentioning

confidence: 99%

Oscillation spectral range of Yb-doped fiber lasers

2006

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Abstract:In this brief review we consider the main factors determining the oscillation spectral range of cladding-pumped ytterbium-doped fiber lasers (YDFLs) and the results obtained for lasers emitting at various wavelengths. Like erbium-doped fiber amplifiers we suggest dividing the oscillation spectral range of YDFLs into three bands, namely: convenient (C-band), short (S-band), and long (L-band). Polymer-coated double-clad fibers with the inner cladding having a size of more than 100 µm allows one to get efficient operation in the convenient range (Cband): 1060 − 1130 nm. To get an oscillation within the S-band (976 − 980 nm and 1020 − 1060 nm) it is necessary to use active fibers with a small square of the inner cladding. Heating of the active fiber gives the possibility to get lasing within the L-band λ > 1130 nm). Another way to get an emission in this spectral range is by the application of long-wave pumping by a C-band YDFL. Also, we indicate some features that require further study.

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Section: Wavelength Nmmentioning

confidence: 99%