Device for reducing the granulation in the transmission of optical information by means of a highly coherent beam of radiation

摘要

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.