IN-SITU OBSERVATION OF THE PERIODICAL DOMAIN-STRUCTURE FORMATION IN KTIOPO4

The strain-induced periodical domain inversion in KTiOPO4 (KTP) has be en demonstrated in situ by means of the nonlinear light diffraction. T he temperature of 730 degrees C was found to be the starting point of the opposite sign domains growth under the heating of -Z KTP substrate (rate 70 degrees C/s) with the periodical SiO2 mask. The depth of the fabricated domain-reversed structure of the 5.5 mu m period was measu red to be 4.5 mu m. (C) 1996 American Institute of Physics.