一种激光驱动的超短X射线光源

介绍一种可产生超短脉冲的新型Ｘ射线光源。它由多碱光电阴极、金靶及铍输出窗组成，当该射线管的阴极受到强光照射时，产生光电子发射，并经电场加速后轰击金靶，产生连续谱的Ｘ射线轫致辐射，经铍窗输出。用超短的可见光脉冲驱动该光源，并借助Ｘ射线扫描相机测量了该管的Ｘ射线输出，获得了５ｐｓ的Ｘ射线脉冲，这种光源可方便地用来标定Ｘ射线扫描相机的时间分辨率，此种产生超短电子脉冲的方法可在其他方面获得应用。

AN ULTRASHORT PULSED X-RAY SOURCE DRIVEN BY LASER

A new method to generate ultrashort X ray pulse has been presented. The main point of this method is to bombard a heavy metal target with an ultrashort electron beam. On the basis of the ideal a new pulsed soft X ray diode with multialkali photocathode and gold target deposited on a Be output window has been developed. With the aid of an ultrashort visible light pulse produced by stimulated Ramaan back scattering of frequency doubled mode locked YAG laser, the soft X ray pulse has been generated by this newly developed soft X ray diode and measured with our ready made soft X ray streak camera. The pulse width of 5ps has been obtained by the experiment.