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Effects of feedback

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Related Experiment Video

Updated: Jul 15, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Beat-note jitter suppression in a dual-frequency laser using optical feedback.

Luc Kervevan¹, Hervé Gilles, Sylvain Girard

¹Laser Instrumentation Optique et Applications, Centre Interdisciplinaire de Recherche Ions Lasers, CNRS-CEA-ENSICAEN, France.

|April 6, 2007

Summary

This study presents an optical feedback technique to stabilize the radio frequency (RF) beat note of a dual-frequency laser. This method effectively reduces jitter, enhancing laser stability for precise applications.

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Area of Science:

Laser Physics
Optical Engineering
Photonics

Background:

Dual-frequency lasers are crucial for applications requiring precise frequency control.
Jitter in the radio frequency (RF) beat note degrades laser performance.
Existing stabilization methods may lack efficiency or tunability.

Purpose of the Study:

To demonstrate an efficient optical feedback technique for suppressing RF beat note jitter in a dual-frequency Ytterbium:Erbium (Yb:Er) glass laser.
To achieve high-accuracy stabilization and tunability of the laser's beat note.

Main Methods:

A self-injection locking process utilizing one laser mode as a master oscillator.
Frequency-shifted optical feedback to stabilize the second laser mode.
An acousto-optic modulator (AOM) integrated into a double-pass optical feedback loop.
Control of a reference oscillator for beat note tuning.

Main Results:

Suppression of jitter on the RF beat note between the two modes of the Yb:Er glass laser.
Stabilization of the beat note near 170 MHz with an accuracy of 250 mHz.
Demonstration of beat note tunability over a range of 300 kHz.

Conclusions:

The demonstrated optical feedback technique is effective for stabilizing the RF beat note of dual-frequency lasers.
The method offers high precision and tunability, with potential for various photonic applications.
Further investigation into the technique's extensions and limitations is warranted.