Abstract
The ring shape of doped rare earth core fibre (M-profile fibre) gives possibility to stimulate luminescence form inside of the fibre with higher efficiency of coupling. In this type of fibre the inner and outer claddings have lower than the ring core refraction indexes. The pump light is guided by the multimode inner cladding and the laser light is guided by the doped rare earth ions ring-core [1]. In concrete defined cond itions (NA, thickness of ring) the ring supports only radially fundamental modes. The pump absorption is almost complete b ecause of the geometry that kind of fibre construction [6]. Heavy metal oxide (HMO) glasses are very attractive hosts for rare earth ions. Among the HMO glasses one of the most interesting are PbO-Bi
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