PHASE-MATCHED BROAD-BAND RAMAN AMPLIFIERS

The use of angle-tuned phase matching is shown by analysis and compute r simulations to reduce limitations on the pump-laser bandwidth in Ram an amplifiers of either near-collinear or crossed-beam geometries. Thi s technique requires careful adjustment of the input beam angles and t he use of prisms or gratings in the input and output beams. Simultaneo us high conversion of multiple spectral lines or a broad-band spectrum can be obtained over a much wider range of temporal- and spatial-pump -intensity variations than in conventional designs. Intensity-phase pr int-through from multiple-line coupling can be significantly reduced, improving beam quality.