Volume Bragg gratings in chloride photo-thermo-refractive glass after femtosecond laser bleaching

Abstract

We report on the optical properties of volume Bragg gratings in chloride photo-thermorefractive glass after femtosecond laser bleaching. We show experimentally that irradiation of the gratings with femtosecond laser pulses can expand their transmission into the whole visible range without dramatic decrease of diffraction efficiency. The mechanism of glass bleaching is considered and modulation of refractive index is described in terms of the coupled wave theory for mixed volume Bragg gratings.

Голографические Оптические Компоненты На Основе Фоторефрактивных Кристаллов И Стекол: Сранительный Анализ И Перспективы Развития

“…бромидных" (c нанокристаллами NaBr-AgBr) и " хлоридных" (с нанокристаллами NaCl-AgCl) ФТР стекол [27,28], у которых изменение показателя преломления положительное по сравнению со "…”

Holographic Optical Components Based on Photorefractive Crystals and Glasses: Comparative Analysis and Development Prospects

“…Those investigations formed the basis for the creation of new PTR glasses. They may include the development of bromide (with NaBr-AgBr nanocrystals) and chloride (with NaCl-AgCl nanocrystals) PTR glasses [27,28] in which the change in the refractive index is positive as compared to fluoride (with NaF nanocrystals) PTR glasses having a negative change in the refractive index. These glasses open the possibility of recording waveguide structures when using focused laser radiation both on the surface of PTR glass and in its volume.…”