Design of a diffractive variable magnification telescope

Details Design of a diffractive variable magnification telescope Design of a diffractive variable magnification telescope

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2152...14m&link_type=abstract

Proc. SPIE Vol. 2152, p. 14-20, Diffractive and Holographic Optics Technology, Ivan Cindrich; Sing H. Lee; Eds.

Physics

Optics

1

Scientific paper

For applications in Doppler radar processing, it is necessary to convolve a one-dimensional signal with spatially scaled versions of a single reference. To achieve this one can expand the reference in one dimension, image it though a system that has variable-magnification in this dimension, and perform a one- dimensional convolution with the input signal in the orthogonal direction. To realize the variable magnification imaging system, we consider the construction of a telescope that uses two hybrid diffractive-refractive elements. The refractive component for the elements is a cylindrical lens that provides bias focussing power. The diffractive component for the first element provides the modulation of the optical power necessary to achieve variable- magnification. The second diffractive component is used to correct the phase of the output image and produce a collimated output. Closed form and iterative designs are presented.

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