Laser synchrotron radiation as attosecond X-ray source

The frequency upshifting and differential cross section of the laser synchrotron source (LSS) are studied based on the Thomson backscattering of intense laser radiation from a counterstreaming relativistic electron. A counterstreaming relativistic electron interacting with an incident short pulse laser emits attosecond X-ray pulse, the frequency upshifting of the backward scattered radiation under the short pulse laser is identical with that under the long pulse laser. The pulse width of the backward scattered radiation decreases with the increase of the electron’s initial energy, and the collimation of the scattered radiation becomes better.