研究目的
To propose and verify a new optical angle sensor that employs a mode-locked laser as the light source and utilizes chromatic dispersion of a collimator objective to detect the angular displacement of a target.
研究成果
The proposed optical angle sensor using a mode-locked laser and chromatic dispersion of a collimator objective was demonstrated to be feasible for measuring small angular displacements. A resolution of 0.23 arc-second was estimated, with potential for improvement through further optimization.
研究不足
The initial incident angle θ0 was treated as a known parameter, and experiments were limited by the small stroke of the PZT tilt stage. The resolution obtained was lower than expected, indicating a need for further optimization of the optical setup.
1：Experimental Design and Method Selection
The methodology involves using a mode-locked femtosecond laser beam and a collimator objective with chromatic dispersion to detect angular displacement. The reflected laser beam's optical modes are separated by chromatic dispersion to generate focused laser beams for measurement.
2：Sample Selection and Data Sources
A mirror reflector mounted on a piezoelectric (PZT) tilt stage system was used as the target. The optical spectrum of the laser beam coupled into a single-mode optical fiber was analyzed by an optical spectrum analyzer.
3：List of Experimental Equipment and Materials
Mode-locked femtosecond laser source (C-Fiber, MenloSystems GmbH), collimating lens, PZT tilt stage (PSH2z, Piezosystemjena Inc.), single-mode optical fiber, collimator objective, optical spectrum analyzer (AQ6370C, YOKOGAWA Co.).
4：Experimental Procedures and Operational Workflow
The femtosecond laser beam was collimated and made incident to a mirror reflector. The reflected beam was focused on an edge of a single-mode optical fiber by a collimator objective. The laser beam coupled into the fiber was analyzed by an optical spectrum analyzer to acquire the optical spectrum.
5：Data Analysis Methods
The change in peak frequency in optical spectra was detected to measure angular displacement. The angular displacement giving maximum light power was determined by fitting a quadratic function to the change in normalized light power of each frequency component.
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