Abstract: A method of manufacturing a radiation-resistant optical fiber and a thus-obtained radiation-resistant optical fiber, the method includes the following steps: a) manufacturing a silica optical fiber preform; b) forming, in the preform, a longitudinal cavity; c) drawing the preform so as to form an optical fiber (1) including a core (2), an optical cladding (6) and at least one longitudinal cavity (3) having at least one opening (13) at one end of the optical fiber (1); d) applying, during step c) of fiber drawing, a gas-tight coating (4); e) exposing the optical fiber (1) to a gaseous substance, including preferably gaseous hydrogen and/or gaseous deuterium, in such a way to incorporate the gaseous substance in silica via the opening (13); and f) closing any opening (13) at both ends of the optical fiber.

Abstract: A high-power optical fiber laser includes: an oscillator (1); a pumping laser (5) able to emit a high-power pumping optical radiation beam; and a signal-amplifying optical fiber (3) able to receive the optical source signal and the high-power pumping optical radiation beam so as to generate a high-power laser beam. The pumping laser includes a plurality of pumping multimode laser diodes (7a-7f) and a laser cavity, the laser cavity including a double-clad fiber (4) including: a neodymium-doped monomode waveguide; a fiber Bragg grating (9) forming one end of the laser cavity; and a fiber reflector (11) forming the other end of the laser cavity, the monomodefiber laser being able to generate a laser radiation beam when it is optically pumped by a pumping radiation beam originating from the plurality of pumping laser diodes in order for the laser cavity to emit a high-power pumping laser radiation beam.

Abstract: A radiation-resistant optical fiber includes at least one core and at least one first cladding surrounding the core. The core includes a phosphosilicate matrix, the core being rare-earth doped, the rare earth being chosen from erbium, ytterbium, neodymium, thulium or erbium-ytterbium of thulium-holmium codoped and the core is cerium codoped. Also described is a method for radiation-hardening an optical fiber including the core having a phosphosilicate matrix, the core being rare-earth doped, the rare earth being chosen from erbium, ytterbium, neodymium and thulium, or erbium-ytterbium or thulium-holmium codoped, and including a step of cerium codoping the core of the fiber.