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提出了基于旋转λ/2波片无色散相移器的理论模型,和实施该相移器功能的全场光学相干层析成像(Optical coherence tomography,OCT)系统,为实现快速、高分辨光学相干层析成像提供了一种有效方法。该相移器能在宽光谱范围内无色散地获得八倍于λ/2波片旋转角的相移量,避免了利用单色光相移算法提取信号时存在的系统误差。针对修正Carré算法和三步相移算法所要求的不同相移量,在240 nm波长范围内,对相移器的性能进行了数值分析。结果表明,在给定光谱范围内,相移量越大,相移误差的绝对值也越大,幅值比变化范围也越大。用于实施无色散相移器功能的全场光学相干层析成像系统结构,与现有结构相比,具有一些有益的特点。
A theoretical model based on a rotating λ / 2 wave plate without dispersion phase shifter and an optical coherence tomography (OCT) system implementing this phase shifter are proposed. In order to achieve fast and high resolution optical coherence Tomography provides an effective method. The phase shifter can obtain a phase shift of eight times the rotation angle of the λ / 2 wave plate without dispersion in a wide spectral range, and avoids the systematic error in extracting the signal by the monochromatic optical phase shift algorithm. According to the different phase shift required by the modified Carré algorithm and the three-step phase shift algorithm, the performance of the phase shifter is numerically analyzed in the wavelength range of 240 nm. The results show that the larger the phase shift is, the larger the absolute value of the phase shift error and the larger the amplitude ratio change within a given spectral range. A full-field optical coherence tomography system for implementing the function of a chromatic aberrant phase shifter has some beneficial features compared to existing structures.