Abstract
The joint action of an external tensile mechanical stress applied to a fiber and high-power UV light pulses on a photosensitive optical fiber has been investigated. The mechanism of formation of fiber Bragg gratings of the type IIA in photosensitive optical fibers has been revealed, and a theoretical model of their formation has been constructed. This mechanism has been confirmed by a series of experiments on the formation of fiber gratings. It has been established that the actions of UV light pulses on stressed and unstressed fibers differ fundamentally. The critical value of the tensile stress of the fiber at which structural defects intensively nucleate in the fiber under the joint action of the irradiation and external load has been determined. This stress coincides with the breaking stress in our experiments.
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