Low Wavefront Aberrations Research Articles

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 ( >

Microcollimated laser diode with low wavefront aberration

A microcollimated laser diode (MCLD) utilizing a 1-mm short focal length, phi 0.5-mm small diameter micro Fresnel lens (MFL) as the collimating lens is discussed. The MCLD is assembled with a 780-nm quantum-well laser diode dice and an MFL in the smallest commercially available laser package. The radiated laser beam from the MCLD has a power of higher than 2 mW at 50 mA driving current, a phi 2 mm beam diameter with a nearly Gaussian intensity profile, and a low wavefront aberration of less than lambda /14 (RMS value) measured at a 1-m distance. >