Abstract

To reproduce the near field intensity of laser beam in the back SBS beam, it is needed to obtain the phase conjugation (PC) fidelity h≥0.95, where h= |∫∫E_LE_sdxdy|²/[∫∫|E_L|²dxdy·∫∫|E_s|²dxdy], E_L and E_s are the laser and Stokes field amplitudes. Such big values of h were attainable at SBS in light waveguide only [1]. However, the waveguide wall damage resistance is a challenge In the case of focused laser beam one can overcome the damage problem but at the cost of decreasing h up to ~0.3 (near SBS threshold and at the divergence θ_L exceeding θ_D = λ/a by ≥3 times). In the present talk we optimize a special arrangement of PC-mirror [2] that can give a new way of achieving nearly perfect PC with h≥0.95 in focused beams.

© 1998 IEEE