Development of white light laser whose beam colour is controllable

本研究的目的是对白光激光器进行直接调制，在高频下以时分的方式产生彩色光束。在这里，白光激光是指一根激光管可以同时振荡三原色的激光。当这项研究开始时，与一家公司合作研发了一台使用这种白光激光的原型式全彩色图像打印机。在那个阶段，白色激光光束被分成三原色，然后对单独的颜色进行调制，最后再次组合，产生彩色光束。这束光束扫描在感光材料上。与普通打印机相比，该打印机产生的全彩色图像打印质量是如此之好。如果能够对白光激光器进行直接调制，将会给出各种技术上的优点。因此，本研究的目的是发明实现白激光光束直接调制的原理和方法。我们考虑了三种方法，(1)控制阴极电位降，(2)应用传统的空心阴极，(3)讨论应用能内电荷转移的可能性。(1)在原理上获得了成功，其结果在国际会议上被报道。关于(2)和(3)，进一步的研究正在进行中。

The aim of this research is to give the white light laser a direct modulation, resulting in a coloured beam in manners of time dividing scheme in high frequency. Here, the white light laser means a laser which can oscillate the three primary colours simultaneously by a single laser tube.When this research was initiated, a proto type full colour image printer with this white light laser was produced by the co-research with a company. At that stage, the white light laser beam was split into three primary colours, then the modulation was given to individual colours, and finally combined again, resulting in a coloured beam. This beam scans on the sensitized material.The quality of the full colour image print produced by this printer was so nice comparing to that by ordinary printer. If we can give the white light laser a direct modulation, various technical merits are given.In this research, therefore, the aim was to invent the principle and method to realize a direct modulation of white laser beam. Three methods, (1)Control of the cathode fall in potential, (2)Application of a herical hollow cathode, (3)Discussion of a possibility to apply an endoergic charge transfer, were considerd.The idea (1) was succeeded in principle and its result was reported at an International Conference. About (2) and (3), futher researches are now under going.