Browsing by Author "Collings, Neil"

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A Holographic Projection System With an Electrically Adjustable Optical Zoom and a Fixed Location of Zeroth-Order Diffraction
(2014-06-01)
Chen, Ming-Syuan
;
Collings, Neil
;
Lin, Hung-Chun
;
Lin, Yi-Hsin
;
光電工程學系
An electrically tunable optical zooming holographic projection system with a fixed location of zeroth-order diffraction is demonstrated. By using two liquid lenses and an encoded Fresnel lens on a liquid crystal on silicon (LCoS) panel, the size of the projected image of the holographic projection system is changeable; meanwhile, the locations of both of the zeroth-order diffraction and the first-order diffraction are unchanged. Therefore, the zeroth-order diffraction can be removed by using a fixed optical high-pass filter. We can use it to realize an image size matching system for green light (532 nm) and red light (632.8 nm) without any positional motion of the optical elements. The optical zoom function enhances the feasibility to realize a high-resolution full-color holographic projection system.
A holographic projection system with an electrically tuning and continuously adjustable optical zoom
(2012-12-03)
Lin, Hung-Chun
;
Collings, Neil
;
Chen, Ming-Syuan
;
Lin, Yi-Hsin
;
光電工程學系
A holographic projection system with optical zoom is demonstrated. By using a combination of a LC lens and an encoded Fresnel lens on the LCoS panel, we can control zoom in a holographic projector. The magnification can be electrically adjusted by tuning the focal length of the combination of the two lenses. The zoom ratio of the holographic projection system can reach 3.7:1 with continuous zoom function. The optical zoom function can decrease the complexity of the holographic projection system. (c) 2012 Optical Society of America
Tunable liquid crystal lens for a holographic projection system
(2013-01-01)
Collings, Neil
;
Lin, Yi-Hsin
;
Lin, Hung-Chun
;
Chen, Ming-Syuan
;
光電工程學系
The tunable liquid crystal (LC) lens designed for a holographic projection system is demonstrated. By using a single patterned electrode LC lens, a solid lens and an encoded Fresnel lens on the LCoS panel, we can maintain the image size of the holographic projector with different wavelengths (lambda: 674nm, 532nm and 445nm). The zoom ratio of the holographic projection system depends on the lens power of the solid lens and the tunable lens power of the LC lens. The optical zoom function can help to solve the image size mismatching problem of the holographic projection system.