Raman despeckling with spectral control
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United States of America Patent
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May 26, 2020
Grant Date -
Mar 9, 2017
app pub date -
Nov 21, 2016
filing date -
Apr 23, 2014
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Abstract
An apparatus and method for controlling the spectrum of stimulated Raman scattering that is used for despeckling of digitally projected images. The stimulated Raman scattering is utilized to add wavelength diversity for reduced speckle and to change the color of the light to a more desirable combination of wavelengths. Digital projection with color-sequential projectors may be enabled by alternately switching the Raman spectrum between green and red. Improved projector transmission may be achieved by minimizing the amount of yellow light generated in the Raman spectrum.
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