Speckle Reduction in Laser Projectors in Controlling Angular, Wavelength, and Polarization Diversities

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  • 角度・波長・偏光多重制御によるレーザープロジェクター におけるスペックル低減
  • Laser Original 角度・波長・偏光多重制御によるレーザープロジェクターにおけるスペックル低減
  • Laser Original カクド ・ ハチョウ ・ ヘンコウ タジュウ セイギョ ニ ヨル レーザープロジェクター ニ オケル スペックル テイゲン

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Speckle reduction by angular, wavelength, and polarization diversities is widely used to suppress speckle in laser projectors. Although several methods achieve these three diversities, few have shown a quantitative comparison among these methods. Thus, in this study, we summarize the speckle reduction effect by the wavelength, angular, and polarization diversities introduced by several different methods. Angular diversity is altered by changing either the angular distribution of the illumination light or the speckle measurement condition. Wavelength diversity is introduced using the continuous spectrum of a Xe lamp with bandpass filters or multiple wavelength lasers. We also discussed the dependency between angular and wavelength diversities. Polarization diversity is introduced with an optical fiber to depolarize the laser light and rotating a half-wave plate to temporally change the polarization state. We also investigated the effect of depolarization on a matte screen.

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