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AssigneeNauchny Tsentr Volokonnoi Optiki Pri Institute Obschei Fiziki Rossiiskoi Akademii Nauk
InventorsEvgeny Mikhailovich Dianov, Alexandr Mikhailovich Prokhorov
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The inventions relate to the sphere of the laser technology, the fibre and integrated optics, and are industrially applicable in elements of the fibre and waveguide optics made of germanium silicate glass, particularly in fibre-optical Bragg gratings and long-spacing gratings, scattering compensators, integrated optical waveguides, etc. The objective of simplification of Raman fibre lasers emitting in the wavelengths of 1.24 mc and 1.48 mc and enhancement of the radiation conversion efficiency in Raman scattering is attained. A laser emitting in the wavelength of 1.24 mc comprises a pumping source (1), a fibre light guide (2) containing P205 in the amount from 1 to 30 mole %, portions of a fibre light guide that contain GeO2 in the amount from 11 to 39 mole % and are Bragg fibre-optical gratings (3) and (4), grating (3) forming a blank distributed reflector of an optical resonator for first Stokes component, and grating (4)--the output distributed reflector for the same resonator. First Stokes component is derived at the output. In a Raman fibre laser emitting in the wavelength of 1.48 mc second Stokes component is derived. A change in the refraction index in a portion of a fibre light guide (11) is achieved by directing to it a laser radiation (12) having a wavelength from 270 to 390 nm that passes through a protection polymer cladding of a fibre light guide (11). 3 independent claims, 23 dependent claims, 7 figures.
A Raman fiber laser, comprising a fiber light guide based on SiO.sup.2 having at least one impurity dope as the active medium, a laser emitting in the wavelength range from 1.0 to 1.1 mc as the pumping source, and two Bragg gratings as the distributed reflectors for wavelength within the range from 1.20 to 1.28 mc forming a resonator, wherein an optical fiber contains P.sup.2 O.sup.5 as the impurity dope, and the distributed reflectors form a resonator for first Stokes component, the optical fiber containing P.sup.2 O.sup.5 in the amount from 1 to 30 mole %.
A Raman fiber laser, comprising a fiber light guide based on SiO.sup.2 having at least one impurity dope as the active medium, a laser emitting in the wavelength range from 1.0 to 1.1 mc as the pumping source, two Bragg gratings as the distributed reflectors for wavelength within the range from 1.20 to 1.28 mc, and two Bragg gratings as the distributed reflectors for wavelength within the range from 1.46 to 1.50 mc forming two resonators, wherein the optical fiber contains P.sup.2 O.sup.5 as the impurity dope, and the distributed reflectors form resonators for first and second Stokes components, the optical fiber containing P.sup.2 O.sup.5 in the amount of from 1 to 30 mole %.
A Bragg fiber grating in the form of a portion of the fiber light guide based on SiO.sub.2 having at least one impurity dope, inclusive of GeO.sub.2, the refraction index of the light guide core having been modulated along its length, wherein the content of GeO.sub.2 is within the range from 11 to 39 mole %.
Dependencies are inferred from the claim text.