<![CDATA[In this paper, we measured the specific electro optic rotary power h of petroleum and spiritus solution in static external electric field Eex using Kerr Effect. The magnitude field to induce the samples is produced by two parallel plates (3 ´ 4 cm2) applied on varied DC high voltage 0-10 kV. Variation of NaCl solution is held on 5%, 10%, until 35%. The light source used to observe change of polarization angle is diode pointer laser 654 nm in wavelength. From the result of experiment we obtained that theh’s value of petrol is (0.1040.008) o/V and for spiritus is (0.0660.006) o/V, indicates that Petrol optics more active than spiritus one.  Key words: non-linear optics, external electrics field, specific electro optic rotary power]]>
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