Noise reduction of dual-wavelength digital holography based on a shorter synthetic-wavelength

Meng Huang; Yibo Wang; Hongpeng Qin; Zhuqing Jiang

doi:10.1117/12.2538895

18 November 2019 Noise reduction of dual-wavelength digital holography based on a shorter synthetic-wavelength

Meng Huang, Yibo Wang, Hongpeng Qin, Zhuqing Jiang

Proceedings Volume 11188, Holography, Diffractive Optics, and Applications IX; 111882D (2019) https://doi.org/10.1117/12.2538895
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

A noise reduction method based on a shorter synthetic-wavelength in DWDH is proposed in this paper. The unwrapped phase at longer synthetic-wavelength is calculated by using the wrapped phases of two individual wavelengths. By comparing the amplified phase of longer synthetic wavelength, of which magnification is equal to that of wavelengths with the wrapped phase of a single wavelength, the difference of phase noises between the longer synthetic-wavelength phase map and the single-wavelength phase map can be calculated, and then accurate height at single-wavelength can be achieved. The proposed method for calculating phase noise is performed by comparing the phases between the single-wavelength with the shorter synthetic wavelength, and then the height at shorter synthetic-wavelength can be obtained. Compared with the existing method, the proposed method can reduce certain noise and benefit the phase reconstruction of fine structures.

Citation Download Citation

Meng Huang, Yibo Wang, Hongpeng Qin, and Zhuqing Jiang "Noise reduction of dual-wavelength digital holography based on a shorter synthetic-wavelength", Proc. SPIE 11188, Holography, Diffractive Optics, and Applications IX, 111882D (18 November 2019); https://doi.org/10.1117/12.2538895

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