The method based on the application of integrating spheres and a movable sample for measurements of scattering and absorption coefficients of transparent and turbid media was implemented for the investigation of optical properties of different organosilicone polymers used in fiber optics, including polysiloxanes doped with metal powder. For the determination of the optical absorption and scattering coefficients together with the scattering anisotropy of polymers basing on the experimental data, the inverse problem of the radiation transfer theory was implemented using two approaches: Monte-Carlo simulation and an analytical solution in the single-scattering approximation.
A technique for measurements of output power of fiber lasers using a metal-coated fiber sensor is proposed. Optical radiation transmitting through the core of a copper-coated silica fiber is partially scattered and, therefore, absorbed in the copper layer. The change of an electrical resistance of the metal coating induced by its heating is measured. This technique can be used for the real-time measurement of output radiation power of fiber laser sources. The measurement range of optical power can be controlled by changing the bend curve radius of the metal-coated fiber. Optical scattering coefficients of the metal-coated fiber core were determined using the proposed theoretical model of the fiber sensor heating.
A method for high-sensitive measurement of optical power of fiber lasers is introduced. It is based on application of a metal-coated fiber as a sensor. A part of optical radiation transmitting through the core of a metal-coated silica fiber is scattered and further absorbed in the outer cladding. The change of electrical resistance of the metal coating induced by its heating is measured. This technique can be used for measurements of the output power of fiber laser sources in real time with minor optical losses and beam distortion. The dynamic range can be widely varied by changing the bend curve radius of the sensor fiber. Optical scattering and bend losses were investigated for different geometries of metal-coated fibers. A heating model of metal-coated fibers was developed.
Laser radiation scattering in copper-coated silica fibers was investigated by measuring electrical resistance of the metal layer. Scattering coefficients were determined using theoretical model of fiber heating induced by absorption of scattered radiation in the coating. This method can be adopted for direct measurement of fiber laser radiation power.
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