PURPOSE:To improve productivity by lancing a substrate in conformity with the cleavage plane direction of the crystal body of a thin org. film from the rear surface of the substrate and forming the smooth surfaces for light incidence and emission on an optical waveguide simultaneously with cutting of the substrate. CONSTITUTION:The direction of the cleavage plane direction of 4'-nitrobenzylidene-3- acetoamino-4-methoxyaniline is observed by a polarizing microscope and thereafter, a mark 3 parallel with the cleavage plane is put on the substrate 1. The substrate 1 is then lanced 4 to 1.95mm depth along the line to be cut from the back surface of the substrate 1 by using a dicing saw while the substrate 1 is pulled to both sides, load is applied toward the lancing 4 from the upper surface of the substrate 1, by which the substrate 1 is cut and the org. crystal body 7 is cloven. The end faces effective for light incidence and emission are thus formed. The shape of the light incident and exit end faces of the org. crystal body is obtd. simultaneously with the cutting of the substrate in such a manner and, therefore, the productivity is extremely good.
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