| 摘要 |
1,124,139. Light deflectors. INTERNATIONAL BUSINESS MACHINES CORP. 1 Nov., 1966 [27 Dec., 1965], No. 48811/66. Heading H4F. [Also in Division G2] A light deflector comprises a birefringent element 43, 65 or 66 immersed in a medium 23 having a refractive index which matches the higher index of the birefringent element so that light polarized in a direction parallel to one axis of the element is transmitted while light polarized in a perpendicular direction is reflected; a reflected beam is aligned with the original direction of the light beam by means of an alignment plate 45, 67, or 68 which has a refractive index equal to or less than that of the lower index of the birefringent element. As shown, a series of birefringent elements and alignment plates is immersed in a fluid bath which may be oil or chlorinated diphenyl. The direction of polarization of light incident on each birefringent element is selected by means of a Kerr cell 31, 51, 53 arranged immediately before the associated birefringent element. A beam of light from a laser 13 is polarized and then passes through a window 25 in the chamber 21 containing the fluid bath 23 to the first Kerr cell. The emergent beam passes through a second window 29 in the chamber at a selected one of eight positions. |
