光熱効果によるマイクロディスクの駆動(第2報) : 進行波の方向制御と振幅制御

概要

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By using modulated laser diode, standing wave is excited on the micro-disk, and guide line of the selection of material for photothermal effect is shown from the properties of the disk material. Amplitude increases with decreasing the thickness of micro-disk. Amplitude increases with ratio of the coefficient of thermal expansion and the thermal conductivity. Moreover, amplitude increases with laser output. It is obtained that stainless steel is most suitable material for photothermal-effect from the properties of the disk material. Traveling wave of mode shape No.3 is excited on a micro-disk by using two modulated laser diodes. Amplitude and direction of the traveling wave are controlled by changing duty ratio of a laser and phase difference. By controlling the phase of the modulated laser diode, traveling wave generated on the micro-disk is controlled to the direction of clockwise or counter-clockwise. By controlling the duty ratio of the modulated laser diode similar to the PWM control, amplitude of standing wave and traveling wave are controlled. The highest peak-to-peak amplitude of standing wave is generated at the duty ratio of 75% and higest peak-to-peak amplitude of traveling wave is generated at the duty ratio of 70%.
社団法人精密工学会の論文
2008-04-05