Speckle reduction in holographic projection using temporal-multiplexing of spatial frequencies

We present a method that significantly reduces the speckle effect in holographic projection. It is based on zero-padding the predefined projected intensity and calculating an extended phase distribution using an optimized iterative approach based on the generalized projection method. The extended phase distribution is divided into several finite ones with the size of the spatial light modulator (SLM). The SLM manipulates an incident plane wave to generate the projected intensity at a remote plane. Utilizing the temporal-multiplexing property of a phase-only SLMand incoherent superposition of the redundant intensities projected across the observation plane reduce the speckle effect. In contrast to the state of the art, no mechanical moving parts and no additional information are required during the projection process. The basic principle of this technique and its experimental verification are described.

[1]  Robert W. Cohn,et al.  Fundamental properties of spatial light modulators for the approximate optical computation of Fourier transforms: a review , 2001 .

[2]  Vincent Ricardo Daria,et al.  Effect of spurious diffraction orders in arbitrary multifoci patterns produced via phase-only holograms. , 2006, Applied optics.

[3]  J R Fienup,et al.  Phase retrieval algorithms: a comparison. , 1982, Applied optics.

[4]  C. T. Bartlett.  A practical application of computer-generated holography to head-up display design , 1994 .

[5]  Claas Falldorf,et al.  Holographic projection based on diamond-turned diffractive optical elements. , 2009, Applied optics.

[6]  Levent Onural,et al.  Holographic Reconstructions Using Phase-Only Spatial Light Modulators , 2008, 2008 3DTV Conference: The True Vision - Capture, Transmission and Display of 3D Video.

[7]  Claas Falldorf,et al.  Digital pre-filtering approach to improve optically reconstructed wavefields in opto-electronic holography , 2010 .

[8]  Tatsuo Uchida,et al.  Speckle reduction mechanism in laser rear projection displays using a small moving diffuser. , 2010, Journal of the Optical Society of America. A, Optics, image science, and vision.

[9]  C. M. Reeves,et al.  Function minimization by conjugate gradients , 1964, Comput. J..

[10]  Ervin Kolenovic,et al.  Suppression of higher diffraction orders and intensity improvement of optically reconstructed holograms from a spatial light modulator , 2009 .

[11]  F Wyrowski,et al.  Iterative techniques to integrate different optical functions in a diffractive phase element. , 1991, Applied optics.

[12]  Timothy D. Wilkinson,et al.  Maskless photolithography via holographic optical projection. , 2010, Optics letters.

[13]  N C Gallagher,et al.  Comprehensive error models and a comparative study of some detour-phase holograms. , 1979, Applied optics.