title: Lensless zoomable holographic projection using scaled Fresnel diffraction.
abstract: Projectors require a zoom function. This function is generally realized using a zoom lens module composed of many lenses and mechanical parts; however, using a zoom lens module increases the system size and cost, and requires manual operation of the module. Holographic projection is an attractive technique because it inherently requires no lenses, reconstructs images with high contrast and reconstructs color images with one spatial light modulator. In this paper, we demonstrate a lensless zoomable holographic projection. Without using a zoom lens module, this holographic projection realizes the zoom function using a numerical method, called scaled Fresnel diffraction which can calculate diffraction at different sampling rates on a projected image and hologram.
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Shimobaba
authors.forename: Michal
authors.initials: M
authors.lastname: Makowski
authors.forename: Takashi
authors.initials: T
authors.lastname: Kakue
authors.forename: Minoru
authors.initials: M
authors.lastname: Oikawa
authors.forename: Naohisa
authors.initials: N
authors.lastname: Okada
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Endo
authors.forename: Ryuji
authors.initials: R
authors.lastname: Hirayama
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Ito