Speckle Reduction in Imaging Projection Systems
Speckle Reduction in Imaging Projection Systems作者机构：Electrical and Computer Engineering Department Michigan Technological University Houghton USA
出 版 物：《Optics and Photonics Journal》 (光学与光子学期刊（英文）)
年 卷 期：2012年第2卷第4期
页 面：338-343页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Diffractive Diffusers Speckle Contrast Reduction Laser Pico-Projectors
摘 要：Diffractive diffusers (phase gratings) are routinely used for homogenizing and beam shaping for laser beam applications. Another use for diffractive diffusers is in the reduction of speckle for pico-projection systems. While diffusers are unable to completely eliminate speckle they can be utilized to decrease the resultant contrast to provide a more visually acceptable image. Research has been conducted to quantify and measure the diffusers overall ability in speckle reduction. A theoretical Fourier optics model is used to provide the diffuser’s stationary and in-motion performance in terms of the resultant contrast level. Contrast measurements of two diffractive diffusers are calculated theoretically and compared with experimental results. Having a working theoretical model to accurately predict the performance of the diffractive diffuser allows for the verification of new diffuser designs specifically for pico-projection system applications.
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