Related Experiment Video
Updated: Mar 7, 2026
06:48
A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
618
Three wavelengths parallel phase-shift interferometry for real-time focus tracking and vibration measurement.
Optics Letters
|February 16, 2017
Summary
This study introduces a novel three-wavelength parallel phase-shift polarization interferometry system for high-resolution focus tracking and vibrometry. It achieves sub-nanometer accuracy for high-velocity motion and vibration analysis with a simple, low-cost design.
Area of Science:
- Optics and Photonics
- Metrology
- Instrumentation
Background:
- Accurate measurement of dynamic motion and vibrations is crucial in various scientific and industrial fields.
- Existing vibrometry and tracking systems often face limitations in speed, accuracy, or cost.
Purpose of the Study:
- To present a novel instantaneous high-resolution, wide-range focus tracking and vibrometry system.
- To demonstrate the first implementation of three-wavelength (3λ) in-parallel three-phase-shift-interferometry.
Main Methods:
- Utilizing three-wavelength parallel phase-shift polarization interferometry with three detectors per wavelength.
- Employing a simple design without active optical components.
Main Results:
- Achieved single-shot position tracking for motion profiles with extremely high velocities and vibration rates.
- Demonstrated sub-nanometer scale accuracy and capability for long inter-step heights.
- The system's performance is primarily limited by detector bandwidth.
Conclusions:
- The developed system offers a high-performance, low-cost solution for advanced vibrometry and motion tracking.
- The novel 3λ in-parallel interferometry approach enables unprecedented measurement capabilities.
