Harmonic diffractive lenses
- Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 (United States)
The harmonic diffractive lens is a diffractive imaging lens for which the optical path-length transition between adjacent facets is an integer multiple {ital m} of the design wavelength {lambda}{sub 0}. The total lens thickness in air is {ital m}{lambda}{sub 0}/({ital n} {minus} 1), which is {ital m} times thicker than the so-called modulo 2{pi} diffractive lens. Lenses constructed in this way have hybrid properties of both refractive and diffractive lenses. Such a lens will have a diffraction-limited, common focus for a number of discrete wavelengths across the visible spectrum. A 34.75-diopter, 6-mm-diameter lens is diamond turned in aluminum and replicated in optical materials. The sag of the lens is 23 {mu}m. Modulation transfer function measurements in both monochromatic and white light verify the performance of the lens. The lens approaches the diffraction limit for 10 discrete wavelengths across the visible spectrum.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 69039
- Journal Information:
- Applied Optics, Journal Name: Applied Optics Journal Issue: 14 Vol. 34; ISSN 0003-6935; ISSN APOPAI
- Country of Publication:
- United States
- Language:
- English
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