A study of the preparation of periodically poled LiNbO₃

The periodically poled LiNbO₃ (PPLN) was prepared by applying external field. Fifty pulses were operated on LiNbO₃ to prepare PPLN, each single pulse is 24.3 kV/mm for 30 ms. The influence of wave form and periodic electrode on periodic poling had been studied systemically. It was found that the frame-like periodic electrode had positive effect on overcoming fringe breakdown, the ratio of finished, product was five times than using comb-like periodic electrode. It was also found that the poling voltage waveforms play an important role in preparation, the fringe breakdown and bulk breakdown could be overcome by using square pulse with a rise-time of 5 ms.