Overlapping of pump beams during multiple passes along cell leads to several effects, which can produce negative influence on output pulse performance. We develop schemes, where overlapping is eliminated or reduced, and obtain reliable generation of compressed pulses with the same duration and stability, as can be obtained for long (with total length ≥ 70 cm) single-pass SBS compressors.
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Aleksandr A. Tarasov, Hong Chu, "Subnanosecond Nd: YAG laser with multipass cell for SBS pulse compression," Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100820Q (17 February 2017);