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High-resolution measurement of laser frequency drift using stable delayed self-heterodyne interferometry
Optics Letters
|September 1, 2023
Summary
This study presents a laser frequency drift measurement system using delayed self-heterodyne technology. The system achieves high precision and long-term stability for monitoring laser frequency evolution.
Area of Science:
- Optics and Photonics
- Metrology and Measurement Science
Background:
- Precise laser frequency stabilization is crucial for various scientific and technological applications.
- Existing methods for monitoring laser frequency drift may lack the required long-term stability or real-time resolution.
Purpose of the Study:
- To develop and demonstrate a novel laser frequency drift measurement system.
- To achieve high precision and long-term stability in monitoring laser frequency evolution.
Main Methods:
- Utilizing the delayed self-heterodyne technique for frequency drift measurement.
- Implementing an ultra-stable optical fiber delay line by phase-locked loop control.
- Employing overlapping Allan deviation to quantify frequency stability.
Main Results:
- Achieved a frequency stability of 6.39 × 10-18 at 1000-s averaging time.
- Demonstrated a real-time measurement resolution of 18.6 kHz.
- Successfully detected a 5-kHz periodic frequency change with a 0.5-s period, indicating high resolution and fast response.
Conclusions:
- The developed system offers high precision and long-term stability for laser frequency drift monitoring.
- The method is suitable for investigating the frequency drift characteristics of lasers post-power-on.
- This technique provides a robust solution for precise monitoring of long-term laser frequency evolution.
