Low-wavefront aberration and high-temperature stability molded micro Fresnel lens

A high-diffraction efficiency (>50%), small lens diameter (0.5 mm phi ), short focal length (1 mm), and thin (0.25 mm) molded micro Fresnel lens suitable for compact optical devices is discussed. The device is fabricated by means of a photopolymerization process using a UV-curable resin. By adopting glass as the substrate, low-wavefront aberration (<0.04 lambda , RMS value) and diffraction-limited focusing characteristics have been obtained at ambient temperatures between 20 degrees C and 100 degrees C. These characteristics are superior to those in a conventional aspherical plastic lens.<
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