The article reports on observation of nanopores nucleated under a tensile stress in the
core of the germanosilicate optical fibers doped with boron. Pores were observed with an
atomic-force microscope on the faces of cleaved fiber tips. Under certain experimental
conditions, pores form a quasi-periodic structure and their sizes are in a good agreement with
predictions of the earlier proposed model based on the theory of phase transitions. The
theoretically estimated threshold stress level for effective nucleation of pores corresponds well
to the results of experimental observations.
Keywords: glass optical fibers; tensile stress; nucleation of nanopores.
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