Deng Dingnan, Qu Weijuan, Tang Qijian, He Wenqi, Liu Xiaoli
Opt Express. 2021 Oct 25;29(22):36871-36885. doi: 10.1364/OE.440980.
We present a single-shot wavelength-multiplexing technique for off-axis digital holography based on a spectral filter. Only a spectral filter is inserted between beam splitter and mirror in reflection off-axis digital holography (RODH). The spectral filter can transmit a well-defined wavelength band of light, while reject other unwanted radiation. By adjusting the filter and mirror separately, the propagation orientation of different reference beams of two wavelengths can be separated, and thus two off- axis holograms with different fringe directions are simultaneously captured by a monochrome camera. The wavefront interference analysis of using a spectral filter is discussed in detail. Our scheme is available for real-time wavelength-multiplexing but requires fewer optical elements and system modifications. Numerical simulation and experiment results of different types of spectral filters demonstrate the validity of proposed method.
我们提出了一种基于光谱滤波器的离轴数字全息单次波长复用技术。在反射式离轴数字全息术（RODH）中，仅在分束器和反射镜之间插入一个光谱滤波器。该光谱滤波器可以透射明确的光波长带，同时滤除其他不需要的辐射。通过分别调整滤波器和反射镜，可以分离两个波长的不同参考光束的传播方向，从而由单色相机同时捕获具有不同条纹方向的两个离轴全息图。详细讨论了使用光谱滤波器的波前干涉分析。我们的方案可用于实时波长复用，但所需的光学元件和系统修改较少。不同类型光谱滤波器的数值模拟和实验结果证明了该方法的有效性。
