Abstract:
The phenomenon of photoinduced refractive index change in active optical fibers with
Al$_{2}$O$_{3}$/P$_{2}$O$_{5}$/Yb$_{2}$O$_{3}$/SiO$_{2}$ core composition has been observed under the action of UV laser radiation with 193-nm wavelength. It is established that hydrogen treatment of active fibers plays a key role in ensuring a radical (about two orders of magnitude) increase in their photosensitivity. It is shown that intrafiber Bragg gratings with reflection coefficients above 99% can be formed, which are promising mirror reflectors for fiber laser cavities.
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