ON THE 2-WAVE MIXING IN BATIO3 WITH A SELF-BENT PUMP BEAM

We report the operation of a two-wave mixing (TWM) photorefractive amp lifier wherein fanning of both pump and signal beams has been simultan eously suppressed to an acceptable limit. This is achieved by the use of an input signal with mixed polarisation in conjuction with a self-b ent pump beam. The possibility of obtaining a good-quality, strong amp lified signal maintaining a high value of the TWM gain makes this meth od particularly suitable for laser beam clean-up applications.