Nanosecond laser back-irradiation through the rear surface onto a metal–glass interface produces a self-propagating emission zone in K8 glass and writes void-free tracks. We correlate propagation velocity with laser parameters using high-speed imaging, and characterize three track positions (focal, peak-velocity, deceleration) by SEM–EDX and polarization holographic microscopy. Strong Na/K enrichment in the recondensed core with an alkali-depleted ring appears in the peak-velocity region and weakens as the front slows. Polarization holographic microscopy reveals a central positive isotropic index change (Δn ~10⁻³), peripheral negative zones, and pronounced retardance, indicating polarization-dependent stress/birefringence and potential for waveguiding.

Салех Х., Конин Ю.А. (науч. рук. Петров А.А.) Optical and structural characterization of modified structures in k8 glass formed by nanosecond laser back-irradiation // Сборник тезисов докладов конгресса молодых ученых. Электронное издание. – СПб: Университет ИТМО, [2026]. URL: https://kmu.itmo.ru/digests/article/17992