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对光纤法布里-珀罗(F-P)腔长偏振互相关解调法中的双折射光楔进行了理论和实验研究,建立了双折射光楔对干涉光程差影响的数学模型,并进行了数值仿真。仿真结果表明,当楔角为4°时,要保证楔面内任意点处的光程误差在15nm以内,入射角应小于0.3°,光楔光轴倾斜应小于0.8°,楔面垂直度误差应小于0.15°。采用光楔进行了偏振光干涉实验,实验干涉条纹与理论条纹基本一致,实验干涉条纹的倾斜度与理论倾斜度相差0.02°。
The theoretical and experimental studies on the birefringent wedges in the Fabry-Perot (FP) cavity-length polarization cross-correlation demodulation are carried out. The mathematical model of the influence of the birefringent wedges on the interfering optical path difference is established. Numerical simulation. The simulation results show that when the wedge angle is 4 °, it is necessary to ensure that the optical path error at any point in the wedge surface is within 15 nm, the incident angle should be less than 0.3 °, the optical axis tilt of the wedge should be less than 0.8 °, and the wedge surface verticality error Should be less than 0.15 °. Polarized light interference experiments were carried out using optical wedges. The experimental interference fringes were basically the same as the theoretical fringes, and the difference between the experimental interference fringes and the theoretical inclination was 0.02 °.