Showing papers on "Extinction ratio published in 1968"
Patent•
12 Apr 1968
TL;DR: In this article, a laser produces a beam of coherent light which is polarized and transmitted through a light modulator that adjusts the orientation of the plane of polarization of the transmitted light in response to a video signal.
Abstract: A laser produces a beam of coherent light which is polarized and transmitted through a light modulator that adjusts the orientation of the plane of polarization of the transmitted light in response to a video signal. The light transmitted by the light modulator then impinges on an analyzer. In one embodiment, the analyzer is adjusted to produce maximum extinction ratio by a motor responsive to the output of a phase detector. The inputs to the phase detector are a reference signal and a signal derived from a reference component of the video signal. The reference component of the video signal is in turn derived in part from the reference signal. In another embodiment, the output of the phase detector controls the video gain so that the white level is properly adjusted.
11 citations
TL;DR: In this paper, a transverse a.d.p. modulator with a halfwave voltage of 250 V, a bandwidth of 3.3 mHz and an extinction ratio of 160:1 is described.
Abstract: Factors affecting the operation of the transverse a.d.p. modulator are discussed. A modulator is described which incorporates a halfwave plate to improve temperature stability and extinction ratio. The modulator has a halfwave voltage of 250 V, a bandwidth of 3.3 mHz and an extinction ratio of 160:1.
1 citations