**5. Concluding remarks**

Resuming, we have shown in this chapter that a diversity of effects can be encouraged at irradiating optical silica-based fibers with dopants of different kinds by high-energy βelectrons. This has been demonstrated on the examples of Ce- and Ce(Au)-doped aluminophospho-silicate fibers, Yb-doped germano-alumino-silicate fibers, and Bi-doped germanoand alumino-silicate fibers. The data presented in this Chapter is a collection of our recent results, published in and in part reproduced from Refs [67, 75, 76]. In each case, unavoidable "darkening" of the fibers in VIS arises as the main feature of electron-irradiation. Meanwhile, such treatment allows one to detect interesting laws in transformations that "active" dopants presented in the fibers suffer as well as to propose mechanisms responsible for the phenomena involved. Also note that the new knowledge arising as the result of considering these trans‐ formations can be helpful for some applications of these or other doped fibers in such areas as dosimetry (on nuclear plants) and space technology and can be as well valuable when designing fiber devices (lasers and amplifiers) for the next-day telecom systems.
