DE1639267

1,153,934. Light deflectors. INTERNATIONAL BUSINESS MACHINES CORP. Oct.2, 1967 [Jan. 16, 1967], No.44708/67. Heading G2J. [Also in Division H4] A light deflector for deflecting a beam containing light of two different wavelengths so that ordinary polarized light is transmitted without deviation while extraordinary light polarized is displaced, comprises a first birefringement crystal I which causes the wavelengths to be deflected by different amounts, and a second birefringement crystal I which recombines the two wavelengths. As shown Fig. 2 light of two wavelengths is passed through a Kerr cell 10 and then through the crystals; when the light is polarized in the first direction by the Kerr cell both wavelengths pass through the crystals as ordinary rays and remain colinear leaving the second crystal at the first point; when the light is polarized perpendicular to the first direction both beams travel as extraordinary rays and are recombined at the second point corresponding to a deflection b.