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We propose and implemented a novel structure and fabrication method of a micro energy harvesting device based on vibration-driven power generation that matches the surrounding oscillation frequency. When the micro energy harvesting device vibrates at its own resonant frequency, its output maximizes. However, a micro device usually has a high resonant frequency, because of the size. We succeeded in...
A vibration-driven micropower generator with a high-Q mechanical resonator efficiently works under single-frequency vibration. However, the associated narrow operation frequency bandwidth tightly limits the power output under commonly observed wideband ambient vibrations. In this paper, we present a power-generation scheme in which the motion of an internal mass element is actively controlled. The...
We demonstrated over 100-nm RGB tunable laser operation (479-497, 515-546, 597-650 nm) using a single 9-cm Pr3+-doped ZBLAN fiber pumped by a GaN-LD. The optimized laser cavity at 635 nm realized slope efficiency of 0.69.
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