Microlens arrays are composed of sub-lenses with dimension of a few tens micrometers. They have the advantages of compact configuration, high integration, unique imaging characteristics, and easy replication in batches. They are gradually emerging in naked-eye display technology. This paper discusses the principle and technique of an anti-counterfeiting label based on a microlens array. Mohr Nanotech 650FG ultra-precision five-axis CNC machine is used to process the microlens arrayed copper master mold and the nickel mold is fabricated by electroplating process. Then the 400-line micro-lens array PC film is produced by the hot embossing process. Finally, by integrating the PC film with the anti-counterfeiting micropattern the function of the anti-counterfeiting label based on microlens array was experimentally verified.
The double filtering system based on single crystal acousto-optic tunable filter (AOTF) in order to improve spectral resolution and reduce side lobe is designed and demonstrated. The effects of single filtering and double filtering on AOTF performance are analyzed. Furthermore, the proposed double filtering technology has the characteristics of high speed, strong stability, flexible tuning, narrow bandwidth and multi-wavelength selection. In this experiment, the spectral bandwidth, side lobe and diffraction efficiency of single filtering and single crystal double filtering in visible range are measured. A double optical wedge compensator is set up at the exit of the double filtering experiment system to compensate the diffracted light drift caused by chromatic aberration. In conclusion, the experimental method of double filtering based on single crystal of tellurium dioxide is better than that of single filtering in spectral resolution and side lobe suppression.
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