We report on the design and fabrication of novel diffractive phase elements that reconstruct distinct intensity patterns in the far-field on illumination with two specific wavelengths. The elements contain deep surface-relief structures that represent phase-delays of greater than 2p radians. The design process incorporates a modified version of the iterative Fourier transform algorithm. A 16 phase-level element for dual wavelength (blue and red) operation, with high diffraction efficiency, is demonstrated experimentally.

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[Optical Society of America ]

1. L. L. Doskolovich, N. L. Kazanskiy, S. I. Kharitnonov and G. V. Uspleniev, "Focusators for laser-branding" Opt. and Lasers in Eng. 15 311 (1991).
2. J. Jahns, M. M. Downs, M. E. Prise, N. Striebl and S. J. Walker, "Dammann gratings for laser beam shaping," Opt. Eng. 28 1267 (1989).
3. E. Tervonen, J. Turunen and J. Pekola, "Pulse-frequency-modulated high-frequency-carrier diffractive elements for pattern projection," Opt. Eng. 33 2579 (1994).
4. J. Turunen, A. Vasara, H. Ichikawa, E. Noponen, J. Westerholm, M. R. Taghizadeh, J. M. Miller, "Storage of multiple images in a thin synthetic Fourier hologram," Opt. Commun. 84 383 (1991).
5. S. Noach, A. Lewis, Y. Arieli and N. Eisenberg, "Integrated diffractive and refractive elements for spectrum shaping" App. Opt. 35 3635 (1996).
6. I. H. Maliston, "Interspecimen comparison of the refractive index of fused silica," J.Opt. Soc. Am. 55 1205 (1965).
7. J. M. Miller, M. R. Taghizadeh, J. Turunen and N. Ross, "Multilevel-grating array generators: fabrication error analysis and experiments," App. Opt. 32 2519 (1993)
8. J. Turunen, J. Fagerholm, A. Vasara, M. R. Taghizadeh, "Detour-phase kinoform interconnects: the concept and fabrication considerations," J. Opt. Soc Am A 7 1202 (1990).
9. F. Wyrowski, "Diffraction efficiency of analogue and quantized digital amplitude holograms: analysis and manipulation," J. Opt. Soc. Am. A 7 1058 (1990).
10. F. Wyrowski, O. Bryngdahl, "Iterative Fourier-transform algorithm applied to computer holography," J. Opt. Soc. Am. A 5 1058 (1988).
11. F. Wyrowski, "Diffractive optical elements: iterative calculation of quantised, blazed phase structures," J. Opt. Soc. Am. A 7 961 (1990).
12. I. M. Barton, P. Blair, M. R. Taghizadeh, "Diffractive phase elements for pattern formation: phase-encoding geometry considerations," Submitted to Applied Optics, 1997.

Other

• L. L. Doskolovich, N. L. Kazanskiy, S. I. Kharitnonov and G. V. Uspleniev, "Focusators for laser-branding" Opt. and Lasers in Eng. 15 311 (1991).
• J. Jahns, M. M. Downs, M. E. Prise, N. Striebl and S. J. Walker, "Dammann gratings for laser beam shaping," Opt. Eng. 28 1267 (1989).
• E. Tervonen, J. Turunen and J. Pekola, "Pulse-frequency-modulated high-frequency-carrier diffractive elements for pattern projection," Opt. Eng. 33 2579 (1994).
• J. Turunen, A. Vasara, H. Ichikawa, E. Noponen, J. Westerholm, M. R. Taghizadeh, J. M. Miller, "Storage of multiple images in a thin synthetic Fourier hologram," Opt. Commun. 84 383 (1991).
• S. Noach, A. Lewis, Y. Arieli and N. Eisenberg, "Integrated diffractive and refractive elements for spectrum shaping" App. Opt. 35 3635 (1996).
• I. H. Maliston, "Interspecimen comparison of the refractive index of fused silica," J.Opt. Soc. Am. 55 1205 (1965).
• J. M. Miller, M. R. Taghizadeh, J. Turunen and N. Ross, "Multilevel-grating array generators: fabrication error analysis and experiments," App. Opt. 32 2519 (1993)
• J. Turunen, J. Fagerholm, A. Vasara, M. R. Taghizadeh, "Detour-phase kinoform interconnects: the concept and fabrication considerations," J. Opt. Soc Am A 7 1202 (1990).
• F. Wyrowski, "Diffraction efficiency of analogue and quantized digital amplitude holograms: analysis and manipulation," J. Opt. Soc. Am. A 7 1058 (1990).
• F. Wyrowski, O. Bryngdahl, "Iterative Fourier-transform algorithm applied to computer holography," J. Opt. Soc. Am. A 5 1058 (1988).
• F. Wyrowski, "Diffractive optical elements: iterative calculation of quantised, blazed phase structures," J. Opt. Soc. Am. A 7 961 (1990).
• I. M. Barton, P. Blair, M. R. Taghizadeh, "Diffractive phase elements for pattern formation: phase-encoding geometry considerations," Submitted to Applied Optics, 1997.

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