γ射线辐射对空间光学玻璃透射率的影响

利用60coγ-线对钡冕玻璃(bak3)、镧冕玻璃(lak3)、火石玻璃(f10)、镧火石玻璃(laf3)、轻火石玻璃(qf3)和重火石玻璃(zf4)进行辐照,研究不同辐照剂量对光学透射率的影响及这些玻璃在空间光学系统中的适应性.光学透射率测试范围为400～1 100 nm.结果表明所有玻璃在辐照后可见光透射率都下降了,而在近红外波段下降不明显(除了qf3和laf3).尽管f10和qf3光学透射率在辐照前相似,但是辐照后f10衰减是所有玻璃中最小的,而qf3衰减最为严重.研究发现,当达到一定辐照剂量后,玻璃材料的透射率不再继续衰减,而是趋于稳定.这些结果为空间光学系统针对辐射进行冗余设计提供了依据.

Gamma ray radiation effects on the transmissivity of some optical glasses in space

This paper studies the effects of 60Co gamma ray radiation on the transmissivity of severa1 types of optical glasses, namely, barium crown, flint, light flint, dense flint, lanthanum flint and lanthanum crown. Transmission spectra in the range of 400~1 100 nm were recorded after exposure to various doses of radiation up to 200 kGy. The results show that the visible transmission for all samples decreases, while the near-infrared transmission sees a slight decrease except QF3 and LaF3. Although the flint and light flint glasses are optically similar before the irradiation, they show a different transmissivity loss after the irradiation, and light flint glass shows the strongest sensitivity with respect to gamma radiation. When the dose increases to some extent, the transmissivity reaches a steady value, ceasing to decrease.These results may help improving radiation tolerance designs for space optical systems.