The electro-optic coefficient γ
63 of ADP crystal which is significant in the application of electro-optic effect of the basal section of ADP is measured by a static method of reading the voltage required to produce a half wave retardation. Besides the value of γ
63 its relation to wavelength is also treated. It is recognized that the voltage required to produce a half wave retardation has linear relation to wavelength, and that the value of γ
63 decreases about 2% in the range 400_??_600 nm.
In the experiment two basal sections of ADP were used and the measured voltage was that produced a quarter wave retardation to each crystal, because in order to get high sensitivity in measuring the voltage of a half wave retardation it was necessary to raise the voltage to that of nearly three quarter wave retardation and the voltage of break down around the edge of crystal was no more than 11000 volt.
About the errors caused by difference of the orientation of two crystals and by discord of the direction of beam and the Z-axis of the crystal are discussed rather minutely.
The gaps between electrodes and crystal were filled with gel composed of sodium stearate dissolved in glycerine with polyvinyl alcohol.
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