Abstract
The high-speed scanning of a focal point by a variable-focus liquid lens is discussed. We have investigated a high-speed variable-focus liquid lens using acoustic radiation force. It consists of a cylindrical aluminum cell with a diameter of 6 mm and a thickness of 3 mm filled with water, silicone oil, and an ultrasound transducer. The oil–water interface can be deformed and the focal point can be changed by controlling input voltage. By exciting with an amplitude modulation (AM) signal, the vibration on the oil–water interface synchronized with the modulation wave was generated. The vibration displacement amplitude decreased with an inverse proportion of f0.66 over 100 Hz, which is close to the resonance frequency of the lens. The path of the laser beam transmitted through the lens was calculated by ray-tracing simulations. The lens could scan at focal lengths of from 7.0 to 14.5 mm at 1 kHz in the axial direction.
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