Raman fiber laser, Bragg fiber diffraction grating and method for varying the refractive index in germanium silicate glass

摘要

TECHNICAL FIELD The present invention relates to the field of laser technology, optical fibers and integrated optics, and to industrial elements of waveguide optics made from optical fibers and germanium silicate glass, in particular optical fiber-optical Bragg diffraction gratings, long spaced diffraction gratings, scattering compensators, integrated optical waveguides, and the like. It is available. The objective of simplifying Raman fiber lasers emitting at wavelengths of 1.24mc and 1.48mc and improving radiation conversion efficiency in Raman scattering is achieved. The laser, emitting at a wavelength of 1.24 mc, produces a pumping source (1), an optical fiber beam guide (2) containing P ₂ O ₅ in an amount of 1 to 30 mol%, a GeO ₂ in an amount of 11 to 39 mol%. And a Bragg optical fiber-optical diffraction grating (3) and (4) containing the diffraction grating (3), wherein the diffraction grating (3) forms a blank distribution reflector of the optical resonator for the first Stokes component, 4) forms an output distribution reflector for the same resonator. The first Stokes component is derived at the output. The second Stokes component is induced in a Raman fiber laser emitting at a wavelength of 1.48 mc. The change in refractive index in the portion of the optical fiber light guide 11 is achieved by guide-transferring laser radiation 12 having a wavelength from 270 to 390 nm passing through the protective polymer cladding of the optical fiber light guide 11.