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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Online Testing Method for the Fine Spectral Characteristics of Narrow-Band Interference Filters Based on a
Kaijun Ji1,2, Yong Yang1, Xin Lin1
1Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.
Sensors (Basel, Switzerland)
|February 24, 2024
Summary
A new laser spectroscopy method offers precise, online spectral testing for narrow-band interference filters. This technique achieves MHz resolution, surpassing traditional spectrometer limitations for improved accuracy.
Area of Science:
- Optics and Photonics
- Spectroscopy
- Materials Science
Background:
- Narrow-band interference filters are critical optical components.
- Filter performance is sensitive to temperature and angle, necessitating precise measurements.
- Traditional spectrometer methods lack the accuracy and online capabilities required.
Purpose of the Study:
- To develop and validate a high-precision, online spectral characterization method for narrow-band interference filters.
- To overcome the limitations of conventional spectrometer-based measurements.
- To enable real-time spectral analysis of interference filters.
Main Methods:
- Utilized a narrow-linewidth tunable laser for spectral excitation.
- Developed a laser spectroscopy experimental system for filter testing.
- Achieved MHz-level spectral resolution for online measurements.
Main Results:
- Successfully characterized two types of narrow-band interference filters.
- Obtained transmission spectra with a spectral resolution of 318 MHz.
- Demonstrated superior spectral accuracy and online measurement capability compared to spectrometers.
Conclusions:
- The proposed laser spectroscopy method provides high-precision online spectral characterization for narrow-band interference filters.
- This approach offers significant advantages over traditional methods, especially for specialized filters.
- The technique holds considerable application value and future development potential in optical metrology.
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