The particular capabilities of selected combined adaptive optical systems for laser beam shaping in near infrared were studied. Fast switching sequences were obtained by combining an LCoS-SLM with angular-tuning, piezo-driven MEMS-axicons. By flexibly programming highly localized beams into SLM phase maps, the illumination of MEMS microaxicons, tunable spiral phase plates and Fresnel mirrors was optimized to enable for fast, variable and nondiffracting shaping performance. The approach can be applied to advanced types of optical processors like adaptive autocorrelators, or in micromachining. By varying the divergence of an illuminating beam with a liquid lens, spatio-temporal self-imaging of array patterns known as nondiffracting Talbot effect was demonstrated in adaptive mode with tunable Talbot distances.
We present a unique approach for 3D scanners using a single optomechanical component, the tunable prism-lens. We cointegrated piezoelectric actuators with a fluid chamber bounded by a movable glass window at the top and a flexible membrane at the bottom. We assembled the four bending actuators in perpendicular orientation to achieve a small footprint and attached their free ends to the top glass window with thin beam plates. Thereby, we gain a large clear aperture of 18 mm at a small footprint of only 20x20x2.5 mm3 . The actuators can independently pull or push the glass window at the four corners, leading to a fluid displacement and correspondingly deforming the membrane. A symmetric actuation of all the actuators results in a lens effect, with a tunable focal power range of + 12.5 dpt to -10.5 dpt at a response time of 3.5 ms. Conversely, asymmetric actuation results in a prism effect, with a tunable bi-directional scan angle of ± 1.5° at a response time of 2 ms. Hence, both modes can be combined to achieve a 3-dimensional scan by selective actuation. Our unique single component 3D scanner reduces the size and complexity compared to a conventional mirror-lens setup. In the paper, we present the design, fabrication process, analytical model, and optomechanical characterization.
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