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在楔块调整式Talbot干涉仪中,光纤Bragg光栅的写入区为直接由相位模板衍射的±1级衍射光束形成的干涉条纹的近场干涉区,和由±1级衍射光束经两平面镜反射后形成的可调谐写入Bragg波长的干涉条纹的远场干涉区。在改变写入光纤光栅Bragg波长的过程中,光纤光栅的Bragg波长是由平面镜的交叉角决定的,而且,影响调谐精度的三种主要因素被控制在光纤光栅生产允许的范围内,即推动机构的位移误差系数Cd为～-0.08nm/μm,楔块的倾斜误差系数Cα为-0.15～0.23nm/(′),和转动机构的传动角误差系数Cβ为～-0.08nm/(′)。
In the wedge-tuned Talbot interferometer, the written region of the fiber Bragg grating is the interference fringes of the interference fringes formed by the ± 1 order diffracted beams diffracted directly by the phase mask and the interference fringes of the ± 1 order diffracted beams reflected by the two plane mirrors The tunable far-field interference zone formed after the tunable interference is written into the Bragg wavelength. In the process of changing the Bragg wavelength of the FBG, the Bragg wavelength of the FBG is determined by the cross angle of the plane mirror. Moreover, the three main factors affecting the tuning accuracy are controlled within the allowable range of FBG production, namely, the pushing mechanism The displacement error coefficient Cd is -0.08 nm / μm, the tilt error coefficient Cα of the wedge is -0.15-0.23 nm / (’), and the transmission error coefficient Cβ of the rotation mechanism is -0.08 nm / (’).