| http://www.w3.org/ns/prov#value | - In a further feature of the present invention, opposing end faces 47 a, 47 b of optical crystal 47??? through which the optical beam travels are tilted at an angle of approximately 7 degrees (which is a function of the refractive index that the light encounters as it enters and exits the electro-optical crystal as well as the wavelength of light used) so that the refracted beam is directed to the
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