Holographic zone plates for f x theta and collimating lenses |
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Authors: | Ono Y Nishida N |
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Affiliation: | NEC Corporation, Optoelectronics Research Laboratories, 1-1, Miyazaki 4-chome, Miyamae-ku, Kawasaki 213, Japan. |
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Abstract: | A holographic zone plate generated by subtracting the spherical wave phase is proposed, that is, a hologram generated by using two divergent or convergent spherical waves. This holographic zone plate can correct the increase in focal power in a radial direction in contrast with the interferometric zone plate. Use of this holographic zone plate for f x O and collimating lenses is analyzed. For an f x O lens, it is shown that an optimum combination of recording spherical waves exists that satisfies both scan linearity and image field flatness. For a collimating lens for a laser diode, it is shown that aberration can be corrected for different playback wavelengths from that used during recording. |
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