Gamma-ray-irradiated lead-silicate glass shows enhanced photoinduced quasi-phase-matched second-harmonic generation. This is due to the formation of color centers, which serve as traps for space charge, resulting in an internal dc field due to the coherent photovoltaic effect. The color center formation also enhances the χ<sup>(3)</sup> nonlinearity, which contributes to the photoinduced quasi-phase-matched second-harmonic generation as well. We separate these two contributions and show their respective roles.
© 2003 Optical Society of America
(160.2290) Materials : Fiber materials
(160.2750) Materials : Glass and other amorphous materials
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
Yuval Isbi, Shmuel Sternklar, and Er'el Granot, "Optical nonlinearity in gamma-ray-irradiated lead-silicate glass," J. Opt. Soc. Am. B 20, 45-48 (2003)