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Implementation of a Reference Interferometer for Nanodetection

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Published on: April 26, 2014

Single actuator alignment control for improved frequency stability of a cavity-based optical frequency reference.

Samuel T Dawkins¹, André N Luiten

¹Frequency Standards and Metrology Group, School of Physics, University of Western Australia, 35 Stirling Highway, Nedlands 6009 WA, Australia. sam@physics.uwa.edu.au

|August 19, 2008

Summary

We developed a novel method to precisely control laser beam alignment in Fabry-Perot resonators. This technique significantly improves frequency stability by actively suppressing unwanted pointing fluctuations.

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Area of Science:

Optical physics
Precision measurement

Background:

Maintaining precise laser beam alignment is critical for optical resonators like Fabry-Perot cavities.
Fluctuations in beam pointing can degrade the performance of frequency references and other sensitive optical systems.

Purpose of the Study:

To demonstrate a new method for actively controlling laser beam alignment to a Fabry-Perot resonator.
To improve the frequency stability of precision optical frequency references.

Main Methods:

Modulating a beam-steering mirror's orientation in quadrature to induce circular beam motion.
Synchronously detecting and demodulating the resulting optical intensity modulation in the cavity.
Using derived error signals for feedback control to suppress misalignment below 30 Hz.

Main Results:

Achieved 10 dB suppression of alignment fluctuations at 1 Hz.
Improved frequency stability by up to a factor of 4 for precision frequency references.
Demonstrated a method that avoids complex off-axis mode monitoring.

Conclusions:

The developed synchronous detection and feedback method offers effective control of laser beam alignment in Fabry-Perot resonators.
This technique is particularly beneficial for systems where alignment is disturbed by optical elements.
The method enhances the stability and reliability of optical frequency references.