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Theoretical analysis for estimating laser integrated linewidth via frequency-noise power spectral density
Optics Letters
|October 15, 2024
Summary
This study validates laser linewidth measurement using frequency-noise power spectral density (PSD). A new Voigt approximation method improves estimation accuracy, offering a convenient approach for laser linewidth determination.
Area of Science:
- Optics and Photonics
- Metrology
- Signal Processing
Background:
- Laser linewidth measurement is critical for applications like coherent optical communications and LIDAR.
- Existing methods for integrated linewidth estimation rely on frequency-noise power spectral density (PSD).
Purpose of the Study:
- To theoretically validate the estimation of integrated linewidth using frequency-noise PSD.
- To develop an improved estimation method for laser linewidth.
- To establish a relationship between interference visibility and laser linewidth.
Main Methods:
- Theoretical analysis of frequency-noise power spectral density (PSD) for linewidth estimation.
- Development and simulation of the Voigt approximation method.
- Derivation of the relationship between interference visibility and laser linewidth.
Main Results:
- Established the theoretical validity of using frequency-noise PSD for integrated linewidth estimation.
- The Voigt approximation method demonstrates an estimation error below 5%.
- A novel connection between interference visibility and laser linewidth was identified.
Conclusions:
- The Voigt approximation offers a more accurate method for laser linewidth estimation compared to Gaussian approximations.
- The findings provide a potentially simpler method for measuring laser linewidth through interference visibility.
- This research enhances the precision and convenience of laser linewidth characterization.
