1993 | OriginalPaper | Buchkapitel
The Design of Quasi-Periodic Fourier Plane Array Generators
verfasst von : A. G. Kirk, A. K. Powell, T. J. Hall
Erschienen in: Optical Information Technology
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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A technique for the reduction of the peak intensity of noise which arises from Fourier plane array generators is introduced. This is achieved by designing the array generator as a quasi-periodic computer generated hologram. In this way an even distribution of noise is obtained while the required diffraction orders are left as tightly sampled spots. Using the method of generalised error diffusion several different quasi-periodic 4 × 4 array generators are designed. A 14.5 dB reduction in peak noise is obtained for a hologram with 8 × 8 quasi-periods. Diffraction efficiency and array uniformity are not adversely affected by this technique.