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Research on Spatial Optical Path System for Evaluating the Reflection Performance of Quartz-Based Volume Bragg
Jiamin Chen1, Gengchen Zhang1, Hejin Wang1
1State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument, North University of China, Taiyuan 030051, China.
Micromachines
|September 27, 2025
Summary
Researchers developed a novel free-space optical system to accurately measure the reflectivity of quartz-based volume Bragg gratings (VBGs). This system is crucial for high-temperature sensing applications using Fabry-Perot (F-P) cavities, achieving high precision with minimal error.
Area of Science:
- Optics and Photonics
- Materials Science
- Sensor Technology
Background:
- High-temperature in situ sensing demands highly reflective Fabry-Perot (F-P) cavity mirrors with thermal stress matching.
- Quartz-based volume Bragg gratings (VBGs) offer a homogeneous material solution to replace traditional dielectric films for F-P cavities.
- Accurate reflectivity measurement of VBGs is critical for evaluating F-P cavity sensor performance.
Purpose of the Study:
- To propose and validate a free-space optical path reflective measurement system for determining the reflectivity of quartz-based VBGs.
- To optimize the optical design using ZEMAX simulation for achieving optimal spot size and component positioning.
- To calibrate the measurement system and assess its accuracy for micron-scale grating characterization.
Main Methods:
- Design and construction of a free-space optical path reflective measurement system.
- Utilizing ZEMAX optical simulation software for system optimization.
- Calibration of the measurement system by quantifying optical path loss.
- Experimental measurement of VBG reflectivity and comparison with simulation results.
Main Results:
- The measurement system achieved a maximum error of only 1.2% after calibration.
- The measured reflectivity of the quartz-based VBG was 30.84%.
- Experimental results showed good agreement with multi-physical field simulations, with a deviation as low as 0.85%.
Conclusions:
- The developed free-space optical system provides a reliable and highly accurate method for measuring VBG reflectivity.
- This technique is suitable for characterizing micron-scale VBGs, essential for homogeneous integrated F-P cavity sensors.
- The study validates VBG preparation technology and offers core support for advanced optical sensing applications.
