Using phase-only liquid crystal spatial light modulator (LC-SLM) to generate random illumination is always used in phase-retrieval and single pixel imaging as it have high energy efficiency. While the methods were only used to generate monochromatic illumination. This paper aims to use LC-SLM generating the multi-spectral random illumination. The method requires only one SLM; multiple laser beams are simultaneously used to illuminate the entire SLM. Random voltages designed with a probability density function (PDF) are applied to modulate the random phases in the multi-spectral emitted light beam, leading to random amplitude spots in the far field. By optimize the PDF, the random illumination spot can be close to uniform distributed with high efficiency. The average intensities of the random light spots are almost uniformly distributed within the range of the first diffraction order. And the zero-order beam is eliminated. The proposed method has a high energy efficiency and refresh rate and does not require the SLM to have an excessive modulation range. This paper provides a method to generate multi-spectral random illumination using a LC-SLM, which can be used in phase-retrieval and single pixel imaging.

中文翻译：

---

使用液晶空间光调制器的多光谱随机照明

在相位检索和单像素成像中，始终使用仅相位液晶空间光调制器（LC-SLM）产生随机照明，因为它具有较高的能量效率。虽然这些方法仅用于生成单色照明。本文旨在利用LC-SLM生成多光谱随机照明。该方法仅需要一个SLM。同时使用多个激光束照射整个SLM。施加使用概率密度函数（PDF）设计的随机电压来调制多光谱发射光束中的随机相位，从而在远场中产生随机振幅点。通过优化PDF，可以高效地使随机照明点接近均匀分布。在第一衍射级的范围内，随机光斑的平均强度几乎均匀地分布。并且消除了零级光束。所提出的方法具有高能量效率和刷新率，并且不需要SLM具有过大的调制范围。本文提供了一种使用LC-SLM生成多光谱随机照明的方法，该方法可用于相位检索和单像素成像。