Strongly coupled large-angle stimulated Raman scattering of short laser pulses in plasma-filled capillaries

摘要

Strongly coupled large-angle stimulated Raman scattering (LA SRS) of a shortintense laser pulse proceeds in a plane plasma-filled capillary differentlythan in a plasma with open boundaries. Oblique mirror reflections off capillarywalls partly suppress the lateral convection of scattered radiation andincrease the growth rate of the instability: the convective gain of the LA SRSfalls with an angle much slower than in an unbounded plasma and even for thenear-forward SRS can be close to that of the direct backscatter. The long-termevolution of LA SRS in the interior of the capillary is dominated byquasi-one-dimensional leaky modes, whose damping is related to the transmissionof electromagnetic waves through capillary walls.