A concise and powerful method for dual-wavelength digital holography (DWDH) is proposed. By designing a new algorithm, this proposed method bypasses the phase synthesis process and directly obtains the thickness distribution of the object. This method can enlarge the range of measurement with strong noise resistance. For example, noise analysis results show that the proposed method reduces the reconstruction error from 101 nm to 9 nm when the signal-to-noise ratio is equal to 30. Therefore, this method would prove useful for DWDH, and its effectiveness is verified by both numerical simulations and experimental results.

中文翻译：

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双波长数字全息测量范围扩大、抗噪能力强

提出了一种简洁而强大的双波长数字全息（DWDH）方法。通过设计一种新算法，该方法绕过了相位合成过程，直接获得了物体的厚度分布。这种方法可以扩大测量范围，抗噪声能力强。例如，噪声分析结果表明，当信噪比等于 30 时，该方法将重构误差从 101 nm 降低到 9 nm。因此，该方法将证明对 DWDH 有用，其有效性通过数值模拟和实验结果。