Speckle elimination by random spatial phase modulation
AssigneeUniversity of Delaware
InventorCharles C. Ih
Life of this patent
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Abstract
A process and apparatus for improving image creation in a coherent light imagery system which involves directing diffused laser light onto a mirror having a rocking motion that will cause the reflected rays to sweep a two-dimensional area and focusing the reflected light through a diffuser before collimating same for use in image creation. More particularly, this invention creates the rocking motion by applying a combination of voltages to three independent piezo-electric crystals upon which the mirror is mounted.
Claims5
A process for improving image creation by speckle elimination in a coherent light imagery system which comprises directing diffused laser light onto a mirror having a rocking motion that will cause the reflected rays to sweep a two-dimensional area and focusing the reflected light through a diffuser before collimating same for use in image creation.
An apparatus for improving image creation by speckle elimination using coherent light comprising an initial diffuser and a final diffuser, means for imaging the initial diffuser on the final diffuser, a mirror interposed in the path of the light between the initial diffuser and the final diffuser and mounted on three independent piezo-electric crystals and means for independently applying voltages to said crystals to cause the mirror to have a three-dimensional rocking motion.
Dependencies are inferred from the claim text.