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Coherent angular signal amplification using an optical cavity.

Tomofumi Shimoda, Yuki Miyazaki, Yutaro Enomoto

|October 18, 2022

Summary

This summary is machine-generated.

A novel cavity-amplified angular sensor (CAAS) enhances angular motion sensitivity using optical cavities. This breakthrough offers high sensitivity with a small sensing spot size for precision angular sensing.

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Area of Science:

Physics
Optical Engineering
Metrology

Background:

Precision angular sensing is crucial for physical experiments.
Traditionally, optical cavities have not been used to enhance angular motion sensitivity.

Purpose of the Study:

To propose and demonstrate a method for amplifying angular signals using an optical cavity.
To achieve high-sensitivity angular sensing with a small spot size.

Main Methods:

Proposed a cavity-amplified angular sensor (CAAS) that coherently stacks laser electric fields proportional to rotation.
Investigated two experimentally available optical configurations out of three considered.
Adjusted or compensated for the Gouy phase of the optical cavity.

Main Results:

Demonstrated angular signal amplification for two experimental configurations.
Theoretically predicted a fundamental angular sensing noise level as low as 10⁻¹⁵ rad/√Hz.
Achieved this with a 1 mm laser beam size and 10 mW laser power.

Conclusions:

The cavity-amplified angular sensor (CAAS) effectively enhances angular sensitivity.
This method offers a significant advantage in sensitivity for small-spot-size angular measurements.
The proposed technique holds promise for future advancements in precision angular sensing.