Phase based method for location of the centers of side bands in spatial frequency domain in off-axis digital holographic microcopy
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Phase based method for location of the centers of side bands in spatial frequency domain in off-axis digital holographic microcopy
- 发表刊物：
- Optics and Lasers in Engineering
- 摘要：
- The digital holography (DH) off-axis geometry in microscope configuration introduces the tilt phase aberration in construction, resulting in the reconstructed image distortion. The two typical methods of the tilt aberration compensation, digital reference wavefront method and spectrum centering method, all require the hologram spectrum's centering judgment of side band as a precondition. However, it is difficult to judge the center location of side band by the spectral amplitude maximum due to the presence of the quadratic phase aberration, thus producing the residual tilt phase aberration. Therefore, the method for location of the center of side band based on the unwrapped phase in spatial frequency domain is proposed in the pre-magnification configuration. The Fourier spectrum of the hologram is a complex function and its unwrapped phase distribution always appears the extremum corresponding to the carrier frequency. The correct hologram spectrum's center location of side band can be obtained by judging its unwrapped phase maximum, which makes assure of the tilt aberration compensation in the pre-magnification configuration. The feasibility of the proposed approach is demonstrated by applying it to the phase imaging of the micro-hole array, phase grating and phase steps.
- 合写作者：
- Yun Liu, Zhao Wang, Jiansu Li, Jianmin Gao, Junhui Huang
- 卷号：
- 2016, 86
- 页面范围：
- 115-124
- 是否译文：
- 否
- 发表时间：
- 2016-06-02