Dynamic beam-steering by a pair of rotating diffractive elements
| Autor: | Nicola Bregenzer, Stefan Bernet, Monika Ritsch-Marte, Martin Bawart |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Physics Scanner business.industry Beam steering Physics::Optics Field of view 02 engineering and technology Grating 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Lens (optics) Optics law Deflection (engineering) 0103 physical sciences Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology business |
| Zdroj: | Optics Communications. 460:125071 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2019.125071 |
| Popis: | We experimentally demonstrate a compact, on-axis device for two-dimensional steering of the direction of a transmitted beam. It consists of two adjacent diffractive optical elements (DOEs) corresponding to two decentered Fresnel lenses with opposite optical powers. The DOEs can be rotated independently. By controlling the rotation angles of the two elements it is possible to direct an incident beam into a continuous two-dimensional range of deflection angles. Compared to a classical grating scanner based on two adjacent gratings, our approach has the advantage that undesired diffraction orders are defocused. Therefore, if such a system is used in an optical scan head for laser material processing, the undesired diffraction orders do not focus in the plane of the work piece, thus avoiding damage due to hot spots. Another application of the device is to extend the field of view in imaging systems. There, the device may be placed in front of the entrance lens of a camera, which allows one to control the viewing direction without the need of turning the whole camera system. |
| Databáze: | OpenAIRE |
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