Numerical simulation and scheme design for laser beam combination of stimulated Brillouin scattering

A novel scheme for multistage serial stimulated Brillouin scattering(SBS) laser beam combination was presented and numerical simulations were made. In the scheme, six pumping beams with equal energy and pulse width pumped six SBS cells respectively, and a seed beam was injected and passed the six SBS cells in sequence. Numerical simulation shows that six KrF pumping beams with energy of 45J and pulse width of 23ns produce an output Stokes beam with energy of 141.89J and pulse width of 670ps. Numerical simulation also shows that shorter output pulse duration can be obtained, while medium gain is higher and phonon lifetime is shorter.