Vibration transducer using an ultrashort Fabry-Perot cavity

Area of Science:

• Optics and Photonics
• Mechanical Engineering
• Sensor Technology

Background:

• Mechanical vibrations are crucial in many scientific and industrial applications.
• Accurate detection of subtle mechanical vibrations requires sensitive transducer technology.
• Existing optical transducers face challenges in noise reduction and sensitivity.

Purpose of the Study:

• To develop a novel optical transducer for detecting mechanical vibrations.
• To investigate the performance of an ultrashort Fabry-Perot cavity for vibration sensing.
• To characterize the noise levels and sensitivity of the developed optical transducer.

Main Methods:

• Fabrication of an ultrashort Fabry-Perot cavity with a length of 150 µm.
• Utilizing the Fabry-Perot cavity as an optical transducer for mechanical vibrations.
• Measuring the noise level of the transducer at approximately 1 kHz.

Main Results:

• The optical transducer achieved a noise level of approximately 1.3 × 10(-16) m/√Hz at ~1 kHz.
• This performance was achieved without the implementation of a frequency-stabilization system.
• The measured noise level was found to be significant when compared to the fundamental shot noise limit.

Conclusions:

• An ultrashort Fabry-Perot cavity can function as an effective optical transducer for mechanical vibrations.
• The developed transducer demonstrates promising low noise performance, even without frequency stabilization.
• Further improvements may be possible by addressing the difference between measured noise and shot noise.