耐放射線鉛ガラスのナノ秒パルスレーザ誘起着色現象

抄録

High peak power laser attracted attention to utilize in laser processes at hazardous environment, such as deep sea, space and radiation fields. Radiation resistance glasses are used for barrier window near the radiation generators in hospital, and there is the possibility that the radiation resistance glass can use as barrier window in laser cutting process at radiation fields. In this study, coloration and damage of radiation-resistant lead glasses by nanosecond pulse laser with visible wavelength are evaluated. Three kinds of radiation resistance glasses with different lead content: PbO-55 wt%, 71 wt% and PbO free glass are used. As a result, the transitional coloration and damage formation with phase differences had observed by nanosecond pulsed laser irradiation at peak power of 1 kW. Although high-lead concentration glass has lower thresholds for coloration in laser intensity, damage-formation thresholds for both PbO glasses were almost the same. On the other hand, no change was observed after laser-irradiation to PbO-free glass. In addition, photochemical and thermal reaction of PbO by nanosecond pulsed laser irradiation is considered from the result of intensity change at wave numbers 200-500 cm^-1 and 1000 cm^-1 in Raman spectrums.