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High-accuracy self-mixing interferometer based on single high-order orthogonally polarized feedback effects
Optics Express
|July 21, 2015
Summary
A novel self-mixing interferometer utilizes high-order orthogonally polarized feedback for nanoscale measurements. This technique offers enhanced sensitivity and direction discrimination for precision metrology applications.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Metrology
Background:
- Conventional interferometers face limitations in sensitivity and direction discrimination for nanoscale measurements.
- Self-mixing interferometry offers a compact and potentially more sensitive alternative.
- High-order feedback effects in lasers can enhance interferometric performance.
Purpose of the Study:
- To present a simple and high-accuracy self-mixing interferometer.
- To achieve nanoscale resolution using single high-order orthogonally polarized feedback effects.
- To demonstrate the interferometer's potential in nanometrology.
Main Methods:
- Utilizing a dual-frequency laser reflecting multiple times within a Fabry-Perot cavity.
- Implementing a single high-order feedback mechanism where light returns along the same path.
- Generating two orthogonally polarized feedback fringes for analysis.
Main Results:
- Achieved nanoscale resolution with two orthogonally polarized feedback fringes.
- Demonstrated higher sensitivity to weak signals compared to conventional interferometers.
- Successfully measured a 2.5nm step with high accuracy.
Conclusions:
- The developed self-mixing interferometer offers a simple, accurate, and sensitive solution for nanometrology.
- The orthogonally polarized fringes provide capabilities for direction discrimination of measured objects.
- This technology holds significant potential for advanced precision measurement applications.
