The influence of the active-element characteristics on the efficiency of a cadmium-vapor laser pumped by uranium fission fragments was studied experimentally. The 441.6 nm laser radiation of the cadmium ion was studied. An aluminum tube with diameter ~15 mm and an inner coating of U 3 O 8 with thickness 3 mg/cm 2 served as the active element. The neutron source was the BARS-6 pulsed, fast, aperiodic, self-extinguishing reactor. A comparison of the efficiency of the laser with similar data previously obtained under the same conditions for a 48 mm in diameter active element with a ~10 mg/cm 2 thick uranium metal coating shows that a three-fold reduction of the diameter of the active element and uranium coating thickness results in a 2.5-fold increase of the laser efficiency. This confirms the hypothesis of internal losses of laser radiation in the active element of a fission-fragment pumped laser which are due to the scattering of light by transverse sound waves of the gas density which appear during a pumping pulse because of the radial non-uniformity of the energy input.

中文翻译：

---

核泵浦镉蒸汽激光器活性元素的特性

实验研究了活性元素特性对铀裂变碎片泵浦镉蒸气激光效率的影响。研究了镉离子的 441.6 nm 激光辐射。直径约 15 mm 的铝管和厚度为 3 mg/cm 2 的 U 3 O 8 内涂层用作活性元件。中子源是 BARS-6 脉冲、快速、非周期性、自熄反应堆。激光效率与之前在相同条件下获得的类似数据的比较，对于直径为 48 毫米、具有 ~10 毫克/厘米 2 厚铀金属涂层的活性元件，活性元件的直径减小了三倍。元素和铀涂层厚度导致激光效率提高 2.5 倍。