Processing method of spectral measurement using F-P etalon and ICCD

Area of Science:

• Optics and Photonics
• Spectroscopy
• Data Processing

Background:

• Fabry-Pérot interferometry is crucial for spectral analysis.
• Current methods for 1D spectrum acquisition from 2D fringe patterns are limited to full-pixel accuracy.
• Noise reduction remains a challenge in spectral measurements.

Purpose of the Study:

• To develop a novel processing method for precise 1D interference spectrum acquisition from 2D Fabry-Pérot fringe patterns.
• To achieve sub-pixel accuracy in spectral measurements.
• To improve noise reduction capabilities in spectral data.

Main Methods:

• A new processing method is proposed for analyzing 2D Fabry-Pérot fringe patterns.
• The method leverages comprehensive analysis of pixel statistical values.
• It utilizes the full advantage of 2D image information for enhanced accuracy.

Main Results:

• The proposed method achieves sub-pixel accuracy in 1D interference spectrum acquisition.
• Significant noise reduction is observed compared to existing techniques.
• Experimental results demonstrate improved accuracy for measured Brillouin shift and linewidth (around several MHzs).

Conclusions:

• The novel processing method offers superior precision for 1D spectrum acquisition from 2D Fabry-Pérot patterns.
• Sub-pixel accuracy and noise reduction are key advantages.
• This advancement significantly improves the measurement accuracy of spectral parameters like Brillouin shift and linewidth.