研究目的
To propose and verify a new optical angle measurement method based on second harmonic generation with a mode-locked femtosecond laser, utilizing its high peak power and high-intensity electric field characteristics.
研究成果
The proposed optical angle measurement method based on second harmonic generation with a femtosecond laser is feasible, with experimental results demonstrating the principle. However, sensitivity discrepancies with theoretical predictions highlight the need for further optimization, particularly in addressing chromatic aberration effects.
研究不足
The sensitivity observed in experiments was lower than theoretical predictions, partly due to chromatic aberration effects. The method currently requires a focused laser beam for effective second harmonic generation with low-power laser sources.
1：Experimental Design and Method Selection:
The study employs a mode-locked femtosecond laser to generate second harmonic waves in a nonlinear crystal (BBO), with the angle measured based on the intensity of these waves.
2：Sample Selection and Data Sources:
A beta barium borate (BBO) crystal is selected as the nonlinear medium for its suitable phase matching angles.
3：List of Experimental Equipment and Materials:
Includes a mode-locked femtosecond laser, BBO crystal, photodetector, and optical spectrum analyzer.
4：Experimental Procedures and Operational Workflow:
The laser beam is focused into the BBO crystal, and the generated second harmonic wave intensity is measured as a function of the crystal's angular displacement.
5：Data Analysis Methods:
The relationship between the second harmonic wave intensity and the angular displacement is analyzed to verify the measurement principle.
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