Due Optical Transition Radiation(OTR) is produced by the hot electrons transport through solid targets, region of OTR is have lager radiation angle and optical intensity distribution.
The switching from normal dispersion to anomalous dispersion is obtained by varying the intensity from couple to probe transition.
通过改变耦合到探测跃迁的驱动场强度，可以实现从正常色散到反常色散的转换。
3
In a high-intensity optics field, using rotating waves approximation (RWA) and the special transform, the problem of two-level atoms transition attributes to the Hill equation.