Vibration transducer using an optical cavity comprising birefringent mirrors.
We have developed an optical-cavity system comprising birefringent mirrors for a vibration transducer. To obtain a dispersive-shape signal necessary for reading out the information of mirror vibration, we measure the polarization change of the cavity transmission light caused by the natural birefringence appearing on interferential mirrors; this effect is enhanced by the cavity resonance. Since there are no additional polarization-changing elements inside the cavity, we can achieve the high finesse that is indispensable for a highly sensitive vibration measurement. The principle and an experimental demonstration of the system are reported here.
Mio
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N
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113, Japan.
Yuzawa
T
T
Moriwaki
S
S