The radiation hardness of neodymium-doped gadolinium vanadate crystal (Nd:GdVO₄) has been investigated. Crystal with sizes of 4×4×8 mm doped to a level of 0.5% Nd³⁺ and (for comparison) undoped GdVO₄ crystal were γ-irradiated by a ⁶⁰Co source to an absorbed dose of about 10⁶ to 10⁷ rad. The photoinduced absorption spectra of the crystals have been studied. Intense lasing with a differential efficiency up to about 25% was obtained in an irradiated Nd:GdVO₄ crystal. It is shown that irradiation of a crystal up to a dose of 10⁷ rad does not reduce significantly its laser efficiency.

中文翻译：

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γ射线辐照下Nd：GdVO 4激光晶体的辐射硬度

研究了掺钕钒酸钒晶体（Nd：GdVO ₄）的辐射硬度。用⁶⁰ Co光源对4×4×8 mm大小的晶体掺杂到0.5％Nd ³⁺的水平和（作为比较）未掺杂的GdVO ₄晶体进行γ辐照，吸收剂量约为10 ⁶到10 ⁷ rad 。已经研究了晶体的光致吸收光谱。在辐照的Nd：GdVO ₄晶体中获得了高达约25％的差分发射的强激光。结果表明，辐照至10 ⁷ rad剂量的晶体不会显着降低其激光效率。