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Mode matching error signals using radio-frequency beam shape modulation.

A A Ciobanu, D D Brown, P J Veitch

|November 11, 2020

Summary

This summary is machine-generated.

A new sensing scheme improves beam mode matching in interferometers like LIGO. This method uses a single sideband and photodiodes, achieving 99.9% mode matching in experiments.

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Area of Science:

Optical physics
Gravitational-wave astronomy
Interferometry

Background:

Precise mode matching is critical for optimizing performance in coupled cavity interferometers.
Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) requires high precision for gravitational-wave detection.

Purpose of the Study:

To introduce a novel mode matching sensing scheme for coupled cavity interferometers.
To provide a method for closed-loop control of mode matching actuators.

Main Methods:

Utilized a single radio-frequency higher-order-mode sideband and single-element photodiodes.
Developed a sensing scheme that is first-order insensitive to misalignment.
Demonstrated the scheme on a tabletop experiment.

Main Results:

Achieved a mode matching accuracy of 99.9% in a tabletop experiment.
The proposed error signal successfully increased beam mode matching to a cavity.
The scheme can serve as an error signal for closed-loop control systems.

Conclusions:

The novel mode matching sensing scheme is effective and robust against misalignment.
The method shows promise for implementation in Advanced LIGO.
This technique can enhance the sensitivity and performance of gravitational-wave detectors.