Fabrication Of Aspherical Liquid Lenses By UV Curing And The Application

Aspherical lens has developed into one of the most important optical elements, because their comparative smaller optical aberrations. In this thesis, a novel method of fabricating aspherical micro lens with shape manipulation by electrostatic field is proposed. Aspherical lens for Laser Diode (LD) collimation and logarithmic axicons (LA) for compound eye system are fabricated and their optical characteristics are calculated and detected.The main contents of this paper have two parts. They are present as:1.The aspherical lens fabrication system which can fabricate aspherical micro lens by electrostatic shape manipulation, in situ measurement and Ultra Violet (UV) curing is introduced. Base on the fabrication of aspherical liquid lens, a method for the collimating of LD by fabricating the non-circular aspheric lens is proposed. And we make the collimating lens that has two different focus by restricting the underside of the droplet so it can collimate two different divergence angles. Compared with traditional methods, the collimating lenses fabricated by this method needn’t assemblage, that makes the configuration easier, and can improve the efficiency of energy used.2. In a spherical compound eye system, spherical lens will introduce defocus due to different imaging distances in different channels. A novel way to improve the imaging quality of spherical compound eye system using logarithmic axicon was proposed based on its long focal depth. The logarithmic axicon was designed to meet the requirements of imaging in every channel of the compound eye system and fabricated by diamond turning and die rolling over technology. Both numerical analysis and experiments demonstrate that the logarithmic axicon can generate a quasi-Bassel beam with nearly constant beam size over a predetermined range. Off-axis imaging of logarithmic axicon is found to be cross-shaped through the focal depth, which could be utilized for determining the spot center location for position detection and eliminating the defocus when spherical lens is used.