1 August 1994 Pulse-frequency-modulated high-frequency-carrier diffractive elements for pattern projection
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An efficient two-stage algorithm is presented for the synthesis of high-frequency-carrier diffractive elements. First, an on-axis phase-only stripe-geometry element with an unconstrained profile along each stripe is designed by an iterative Fourier transform algorithm. In the second stage, a steep linear phase term is added, and the profile is hard-clipped along each stripe. The result is a binary, pulse-frequency-modulated element suitable, e.g. , for a resonance-domain realization, which permits the elimination of the twin image. Experimental results are provided by direct-write electron-beam lithography and optical lithography, using both fully and partially coherent illumination.
Eero T. Tervonen, Eero T. Tervonen, Jari Pekka Turunen, Jari Pekka Turunen, Jukka Pekola, Jukka Pekola, } "Pulse-frequency-modulated high-frequency-carrier diffractive elements for pattern projection," Optical Engineering 33(8), (1 August 1994). https://doi.org/10.1117/12.176512 . Submission:

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