FIELD: physics, optics.
SUBSTANCE: invention relates to a amplification optical fibre, an optical fibre amplifier and a resonator using said amplifier. The amplification optical fibre comprises: a core; cladding coating the core; and outer cladding coating the cladding. The core allows light having a predetermined wavelength to propagate in LP01 mode and LP02 mode, and has a higher refraction index than the cladding. The core is doped with an active element which stimulates emission of light with the predetermined wavelength. The position where intensity of the LP02 mode becomes zero is doped with a higher concentration than the centre of the core.
EFFECT: providing a high quality light beam even when the higher order mode, which is axially symmetric, is excited in addition to the LP01 mode.
33 cl, 10 dwg
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