Abstract

Periodically poled crystals are a relatively new class of materials artificially made for quasi- phasematched (QPM) nonlinear optical frequency conversion. Crystals from the KTiOPO₄ (KTP) family are particularly attractive for periodic poling as they have low coercive fields (approximately 10 times lower than LiNbO₃) and a quasi-one dimensional crystal structure which together makes it possible to fabricate fine pitch gratings in relatively thick crystals.

© 1999 Optical Society of America