RING SELF-PUMPED PHASE CONJUGATOR FOR HIGH ENERGY PULSES AT 1064 nm WITH RHODIUM-DOPED BaTiO3

An external loop phase conjugate mirror with a 45 degree-cut rhodium-doped BaTiO3 is constructed and characterized. The external loop is composed of an image-relay telescope, a 90 degree-image rotator and a phase modulator. The stable phase conjugation is achieved with nanosecond 20 mJ pulses at 1064 nm. Reflectivity of the mirror as high as 53% is obtained with a response time of 13 s at a repetition rate of 100 Hz. Wavefront compensation is applied to a laser beam whose quality is as poor as M2 > 100. 15 refs.