Device for reducing the granulation in the transmission of optical information by means of a highly coherent beam of radiation
AssigneeU.S. Philips Corporation
InventorsWolfram Schilz, Manfred Rahlff, Uwe Jurgen Schmidt, Klaus Gottfried Plass, Eckhard Schroder
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Abstract
A device is described for reducing the granulation during the transmission of optical information with a highly coherent radiation beam. The device includes a first objective system, a radiation-diffusing element disposed in the image plane thereof, a second objective system and a radiation refracting element of a medium whose refractive property is variable under the influence of an ultrasonic wave.
Claims10
A device for reducing the granulation when transmitting optical information with the aid of a highly coherent beam of radiation, wherein it comprises a radiation diffusing element disposed in the image plane of a first objective system, a second objective system behind the radiation diffusing element, and at least one radiation refracting element of a medium whose radiation refracting property is variable under the influence of an ultrasonic wave whose wavelength is at least of the order of magnitude of the size of a granulation element of the radiation beam at the location of the radiation refracting element.
Dependencies are inferred from the claim text.