此實驗利用雙折射晶體Nd:GdVO4使腔內o-ray與e-ray穩定區分離，以產生徑向偏振光與方位角偏振光。量測狹縫與其通過之線偏振夾角映證其方位上之偏振方向，透過D.O.P驗證圓柱向量光束在不同方位之偏振純度，再經由CCD量測通過偏振片後之光斑。透過 m-square 光學品質因子量測圓柱向量光束中HG01 與HG10兩種偏振模態之量化分析。

This experiment utilizes the birefringent crystal Nd:GdVO4 to effectively separate the o-ray and e-ray within the cavity, generating radially and azimuthally polarized light. The measurement of the angle between the slit and the linear polarization direction confirms the polarization orientation in the azimuthal direction. The degree of polarization (D.O.P.) is employed to verify the polarization purity of the cylindrical vector beam at different orientations, followed by CCD measurement of the beam profile after passing through a polarizer. Quantitative analysis of the polarization modes HG 01 and HG 10 in cylindrical vector beams through m-square optical quality factor measurements.

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