Abstract: The invention relates to the field of laser engineering and fiber optics and is industrially used to pump optical amplifiers used in wide band fiber-optical communication systems. The subject matter of the invention is a Raman fiber laser based on a phosphosilicate fiber, comprising a pumping radiation source 1, a length 2 of a phosphosilicate fiber, at least two pairs of Bragg gratings as reflectors 3 and 4, wherein each pair of Bragg gratings forms an optical resonator, wherein the transmission of energy between the resonators is effected due to stimulated Raman scattering, both at relatively high frequency intramolecular oscillations, related to the presence of phosphorus oxide in the fiber (the frequency difference of such resonators being selected from the range of 1305-1355 cm−1), and at relatively low frequency oscillations related to a silicate matrix of the fiber, the shift of frequencies between such resonators being selected from the range of 50-560 cm−1.

Abstract: The inventions relate to measurements of a hydrostatic and/or fast-changing pressure by optical means, and are suitable for aerodynamic investigations of aircraft and small spacecraft, in robotics, including small force micro-clamps, in remote pressure monitoring (in wells, vessels, cylinders), in medicine and medical and biological investigations, hydroacoustics, security systems. The object is to improve the sensitivity and enhance the temperature and vibration stability of a pressure sensor. The pressure sensor is a low Q-factor Fabry-Perot cavity/interferometer 6 at the end of a single-mode optical fiber 1 with the 4% Fresnel reflection from the silica glass/air interface. Another movable mirror of the cavity is formed by an end face 10 of a short (1-3 mm) optical fiber length 9 having a small inertial mass and inserted into the center of a flexible membrane 9 of 500-700 &mgr;m in diameter, tightly sealing a small air volume of about 1-3 mm3 inside a second capillary 3 with the external diameter of 0.

Abstract: The invention relates to the field of laser engineering and fiber optics and is industrially used to pump optical amplifiers used in wide band fiber-optical communication systems. The subject matter of the invention is a Raman fiber laser based on a phosphosilicate fiber, comprising a pumping radiation source 1, a length 2 of a phosphosilicate fiber, at least two pairs of Bragg gratings as reflectors 3 and 4, wherein each pair of Bragg gratings forms an optical resonator, wherein the transmission of energy between the resonators is effected due to stimulated Raman scattering, both at relatively high frequency intramolecular oscillations, related to the presence of phosphorus oxide in the fiber (the frequency difference of such resonators being selected from the range of 1305-1355 cm−1), and at relatively low frequency oscillations related to a silicate matrix of the fiber, the shift of frequencies between such resonators being selected from the range of 50-560 cm−1.

Abstract: 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.