Beam-clipping-induced diffraction effects in MEMS laser scanners for autostereoscopic outdoor displays
| Autor: | Ulrich Schmid, Gerhard Schmid, Christian Hambeck, Ferdinand Saint Julien-Wallsee, Jörg Reitterer, Walter R. Leeb, Franz Fidler |
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| Rok vydání: | 2015 |
| Předmět: |
Diffraction
Materials science Laser scanning business.industry Aperture Metals and Alloys Physics::Optics Near and far field Condensed Matter Physics Laser Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Optics Clipping (photography) law Physics::Accelerator Physics Laser beam quality Electrical and Electronic Engineering business Instrumentation Beam divergence |
| Zdroj: | Sensors and Actuators A: Physical. 233:582-589 |
| ISSN: | 0924-4247 |
| DOI: | 10.1016/j.sna.2015.06.024 |
| Popis: | In micro-electro-mechanical systems (MEMS) laser scanners, the beams reflected by the micromachined mirror may be truncated at various edges in the system, e.g., due to finite size of the reflective mirror surface, at the rigid supporting mirror frame, and at the package of the light source. In this paper the joint effect of such individual beam clipping is described by introducing a so-called effective system aperture. Diffraction effects induced by this virtual aperture are analyzed by means of Fourier optics incorporating the Fraunhofer far field approximation. The beam clipping theory is then applied to a laser light module with integrated MEMS mirror for autostereoscopic outdoor displays. Employing an optimization of the MEMS mirror tilting angle with respect to the laser light source, the beam-clipping-induced diffraction effects are minimized. |
| Databáze: | OpenAIRE |
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