Research and Development of analyses on radioactive waste by means of laser

我们提出了用激光分析放射性废物的新方法，并研制了实现该方法的装置。开发了以下装置。(1)研制了四重线性离子阱。脉冲激光烧蚀产生的离子被成功捕获。(2)需要用397nm紫外连续激光对离子进行冷却。设计并研制了在激光器外装有非线性晶体的蝴蝶结腔。获得了稳定的、具有足够功率的紫外光。(3)用光栅调制和标准具调制两种方法稳定了再抽运激光器（半导体激光系统）的波长866nm。通过标准具的调制实现了更好的稳定。(4)进行电流光谱法以获得共振的绝对波长。控制每个激光系统的波长，并获得谐振波长。(5)搭建了激光冷却系统，并对激光诱导荧光进行了观察。随着探测系统效率的提高，激光冷却和单离子探测将成为可能。

We have proposed the novel method of analyses on radioactive waste by means of laser and developed the apparatus to achieve the methodology. The following apparatus are developed. (1) The quadruple linear ion trap is developed. The ions that is generated by pulsed laser ablation are successfully trapped. (2) It is necessary to irradiate 397nm ultraviolet cw laser light to cool the ions. The bow-tie cavity with nonlinear crystal outside the laser was designed and developed. The stable ultraviolet light with enough power is obtained. (3) The wavelength, 866nm of the repumping laser (diode laser system) was stabilized with two methods, which used the modulation of the grating and the etalon, respectively. The better stabilization was performed with the modulation of the etalon. (4) Galvano spectroscopy was performed to obtain the absolute wavelengths of the resonance. The wavelengths of each laser system was controlled and obtained the resonance wavelengths. (5) The total system was built to perform laser cooling and the laser induced fluorescence was observed. With more efficient detection system, the laser cooling and single ion detection would be possible.