title: 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.
authors.affiliation: JGM Associates, Inc., 15 New England Executive Park, Burlington, Massachusetts 01803, USA. jgmanni@jgma-inc.com
authors.forename: Jeffrey G
authors.initials: JG
authors.lastname: Manni
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Goodman
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D005583:Fourier Analysis; D007834:Lasers; D008027:Light; D015233:Models, Statistical; D008962:Models, Theoretical; D016011:Normal Distribution; D055100:Optical Fibers; D055095:Optics and Photonics; D012666:Semiconductors; D014466:Ultraviolet Rays