Holographic projection with an extended depth of focus for highly tilted screens. (March 2022)

• Record Type: Journal Article
• Authors: Makowski, Michał; Shimobaba, Tomoyoshi; Kowalczyk, Adam; Sypek, Maciej; Starobrat, Joanna; Suszek, Jarosław; Sobczyk, Artur; Kolodziejczyk, Andrzej
• Is Part Of: Optics and lasers in engineering. Volume 150(2022)
• Publication Date: 2022-03
• Subjects: Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2021.106840
• Languages: English
• ISSNs: 0143-8166

Abstract

Highlights: High quality holographic projection on a highly tilted screen. Extended depth of focus of projection with static phase masks. Anamorphic lossless magnification of projected image to 16:9 aspect ratio. Effective increase of diffraction angles of a spatial light modulator. Abstract: Although holographic projection is still gaining its momentum, it will most likely be realized as short-throw projection on highly tilted screens. This will require the depth of focus significantly larger than the native one coming from the f-number of the optical setup. Here we present a simple and lossless method of extending the depth of focus by a modified holographic encoding comprising virtual optical elements, allowing sharp imaging on a screen tilted by 56°. Numerical simulations and experimental validations on a spatial light modulator are given. The experiment proved the increase of field depth which barely compromises the image quality and its brightness.