Versatile method for achieving 1% speckle contrast in large-venue laser projection displays using a stationary multimode optical fiber
Abstract
We propose a method based on quantitative theoretical analysis for achieving speckle contrast of 1% or less in images created by a full-frame laser projection display system. The method employs a stationary multimode optical fiber to achieve the effect of using a rapidly moving diffuser, but without moving the fiber or any other system component. When a suitably large projector lens is used, low-speckle illumination light delivered through the fiber acts in conjunction with wavelength diversity at the projection screen to achieve speckle contrast of 1% in viewed images. We describe in detail how the proposed method might be used with most types of high-power visible lasers being considered for large-venue displays. When used with visible laser diodes, the method may also be suitable for use in laser-based television.
References
Citations
Step-by-step guide to reduce spatial coherence of laser light using a rotating ground glass diffuser
Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements
Related Concepts
Related Feeds
Cell Imaging in CNS
Here is the latest research on cell imaging and imaging modalities, including light-sheet microscopy, in the central nervous system.