Making An IR HOE Using A CGH

C. S. Ih; L. Q. Xiang; C. W. Yang

doi:10.1117/12.961692

26 October 1989 Making An IR HOE Using A CGH

C. S. Ih, L. Q. Xiang, C. W. Yang

Proceedings Volume 1136, Holographic Optics II: Principles and Applications; (1989) https://doi.org/10.1117/12.961692
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

In addition to the compact size and light weight, a single HOE can often replace several conventional optics. We therefore can expect performance improvement and cost reduction for optical systems using HOE's. Examples are holographic optical heads for R/W optical disks and holographic scanners for laser printers. For many of these applications, laser diodes in ir wavelengths are used as the light source. Since the required recording media or a suitable laser source may not be readily available, we may have to use a computer to generate the HOE's. Ideally these computer generated HOE's are to be written directly by an e-beam machine. Often a moderate size (say 10 mm's) and high resolution (large than 1,000 1/mm) HOE is necessary. Such a HOE is still difficult to make using commercially available e-beam machines. We describe here an alternative method. This approach allows us to make a relative large and high resolution HOE without an e-beam machine. Another advantage is that the method can be extended to make Bragg (or volume) ir hologram using visible light. Basically we make a pre-distorted CGH with which the final HOE can be made using visible light. The HOE can then be reconstruct at the ir wavelength without aberrations. Since we need to generate the pre-distorted CGH from another hologram, we describe two methods, the Grating Period and Tangential Plane, to determine the additional phase change introduced by the grating structure. Both methods produced the correct CGH. Experiments with simple HOE designs and also with a more complicated holographic optical head design are shown.

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C. S. Ih, L. Q. Xiang, and C. W. Yang "Making An IR HOE Using A CGH", Proc. SPIE 1136, Holographic Optics II: Principles and Applications, (26 October 1989); https://doi.org/10.1117/12.961692

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KEYWORDS

Holographic optical elements

Computer generated holography

Holograms

Wavefronts

Holography

Head

Diffraction gratings

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