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针对现有的静态斜楔干涉具无法实现零光程差,并且对被测光的空间相干性要求较高,进而影响光谱反演的准确性和复杂性问题,提出了一种新型等效斜楔干涉具,该等效斜楔由两种折射率不同的材料构成,两个反射面完全垂直,干涉的两束光是由同一束光分开而得,因此对光的空间相干性无太高要求,并且可以实现零光程差。理论推导了该斜楔不同位置的光程差公式和光谱反演公式,并且设计了该等效斜楔,其最大光程差可达168.3μm,对光谱测量过程进行了仿真分析,结合最大光程差和所测光谱波段分析了线阵CCD的像元数要求。采用532 nm单纵模激光器和632.8 nm氦氖激光器进行了实验分析,实验结果得到中心波长误差小于0.2%。
Aiming at the problem that the existing static wedge interferometer can not achieve zero optical path difference and has high requirements on the spatial coherence of the measured light and affects the accuracy and complexity of spectral inversion, Wedge interferometer, which is composed of two materials with different refractive indices. The two reflecting surfaces are completely vertical. The two interfering beams are separated by the same beam, so the spatial coherence to light is not too high Requirements, and can achieve zero optical path difference. The optical path difference formula and spectral inversion formula of different position of the wedge are deduced theoretically. The equivalent wedge is designed, the maximum optical path difference can reach 168.3μm, the spectrum measurement process is simulated and analyzed, Path difference and the measured spectral band of the linear CCD pixel number requirements. The experimental results of 532nm single longitudinal mode laser and 632.8nm He-Ne laser show that the central wavelength error is less than 0.2%.