Title :
Low-wavefront aberration and high-temperature stability molded micro Fresnel lens
Author :
Tanigami, M. ; Ogata, S. ; Aoyama, S. ; Yamashita, T. ; Imanaka, K.
Author_Institution :
OMRON Corp., Kyoto, Japan
Abstract :
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.<>
Keywords :
aberrations; integrated optics; lenses; optical workshop techniques; 0.25 mm; 0.5 mm; 1 mm; 20 to 100 degC; UV-curable resin; compact optical devices; diffraction-limited focusing characteristics; high-diffraction efficiency; high-temperature stability molded micro Fresnel lens; low-wavefront aberration; photopolymerization process; short focal length; small lens diameter; Diffraction; Glass; Laser beams; Lenses; Magnetic flux leakage; Plastics; Resins; Stability; Temperature; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
