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Heterodyne interferometer scheme using a double pass in an acousto-optic modulator.

Youngkyu Park¹, Kyuman Cho

¹Department of Physics, Sogang University, Seoul, Korea.

|February 2, 2011

Summary

We developed a new heterodyne interferometer using a double-pass acousto-optic modulator for precise vibration measurement. Its sensitivity is currently limited by the analog-to-digital converter resolution.

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Area of Science:

* Optics and Photonics
* Metrology and Measurement Science

Background:

* Heterodyne interferometers are crucial for precise measurements.
* Acousto-optic modulators offer versatile beam manipulation capabilities.

Purpose of the Study:

* To introduce a novel heterodyne interferometer scheme.
* To demonstrate its application in measuring small amplitude vibrations.

Main Methods:

* A double-pass arrangement of acousto-optic modulator deflected beams.
* Signal processing using an I/Q demodulator.
* Utilizing a 16-bit analog-to-digital converter for data acquisition.

Main Results:

* The interferometer successfully measured small amplitude vibrations.
* Theoretical quantum noise limited sensitivity was not achieved.
* Phase measurement sensitivity was limited by the A/D converter resolution.

Conclusions:

* The proposed heterodyne interferometer scheme is viable for vibration analysis.
* Future improvements can focus on higher-resolution analog-to-digital converters.
* The double-pass acousto-optic modulator design offers potential for enhanced interferometric systems.