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    Öğe
    DEMONSTRATION OF RESONANT ADAPTIVE MIRRORS
    (IEEE, 2021) Kamel, Amr; Kocer, Samed; Das, Taylan; Mukhangaliyeva, Lyazzat; Saritas, Resul; Hajireza, Parsin; Yavuz, Mustafa
    We present a novel continuous deformable mirror (DM). The mirror can be integrated into optical systems to compensate for multiple wavefront aberrations during real-time scanning of the human retina and other targets. Specifically, it can correct all seven of the wavefront aberrations dominant in ophthalmic applications. The mirror assumes the desired shape to correct an aberration via resonant electrostatic actuation. It eliminates the need for a large number of electrodes and dependence algorithm required for spatial control of segmented DMs. It also realizes an additional benefit of dynamic amplification, thereby increasing the stroke distance. In addition, we demonstrate that the fundamental (defocus) mode of the DM can be used to change the location of the focal point for a reflected laser beam by up to 485 mu m.
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    Öğe
    RESONANT VARIFOCAL MEMS MIRROR
    (IEEE, 2022) Kocer, Samed; Mukhangaliyeva, Lyazzat; Saritas, Resul; Gulsaran, Ahmet; Elhady, Alaa; Bell, Kevan; Kamel, Amr
    This paper presents a novel varifocal mirror made of a micro-electromechanical system (MEMS) continuous deformable mirror (DM). It uses resonant electrostatic actuation (REA) via single voltage waveform to vary the focus of a 1.6 mm circular DM. Unlike traditional DMs, REA eliminates the need for individually addressable electrodes and the use of complex influence functions. It also minimizes the electrode count, thereby providing for simpler and faster modulating DMs. The DM was integrated into an adaptive optics system as varifocal mirror. The system was able to realize an 8 cm focal shift between focal lengths of 11 cm and 19 cm by changing the phase angle between the DM drive signal and the pulse signal of the incident laser beam.