NONLINEAR OPTICAL ELEMENT

摘要

PURPOSE:To obtain a high-performance waveguide type nonlinear optical element by using a crystal layer having the cleavage face of prescribed 4'- nitrobenzylideneaniline-3-acetoamino-4-methoxyaniline (MNBA). CONSTITUTION:The single crystal of the MNBA is obtd. by heating and dissolving the crystal powder of the MNBA expressed by the formula and cooling the soln. down to room temp. then evaporating the same slowly at room temp. A smooth thin sheet having a large area is obtd. without depending upon the difference in conditions for crystallization when such single crystal is cloven at the (100) face. The contact surface of the thin single crystal sheet 1 of the MNBA is swellen with higher alcohol such as isopropyl alcohol having slight solubility in the MNBA and is brought into pressurized contact the top of soda glass 2 or the like having a low refractive index. The crystal orientation is so selected as to draw out the large nonlinear optical effect inherent to the MNBA to the max. possible extent and the waveguide element having good characteristics is obtd. without requiring special processing techniques according to such constitution.