Abstract
A new type of Raman plasma amplifier has been proposed using a stimulated Raman near-backscattering scheme with a pulse-front-tilted pump. In order for the seed to overlap spatiotemporally with the pump, the propagation angle of the pump with respect to the seed path is set at twice the angle of the pulse-front tilt. The length of the pump passing each point of a plasma is dependent on the angle of the tilt. As a result, the tilt angle can be tuned to control the plasma temperature as well as the Raman spontaneous radiation growth length, which can be optimized for the seed amplification and significantly suppress the precursors growing from the plasma noise.
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