Efficient Way to Prevent Reflection from Stimulated Brillouin Backscattering

The same physical mechanism which causes stimulated Brillouin backscattering of a laser pulse when interacting with the underdense plasma (in laser fusion systems) can be used to reverse the scattering direction in order to drastically reduce the reflectivity. Forced stimulated rescattering may be obtained by additional radiation pulses or by a multihumped spectrum with each peak down-shifted by twice the acoustic frequency. Analytical four-mode and numerical six-mode models show strong reduction of the reflectivity for the same input intensity.