![](/images/ico/ico_close.png)
![](/images/ico/ico4.png)
Publication series : Holographic Materials and Optical Systems
Author: Miguel León-Rodríguez Juan A. Rayas-Alvarez Amalia Martínez-García and Raúl R. Cordero
Publisher: IntechOpen
Publication year: 2017
E-ISBN: INT6325566750
P-ISBN(Paperback): 9789535130376
P-ISBN(Hardback): 9789535130383
Subject: TP39 computer application
Keyword: 计算机的应用
Language: ENG
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Microtopography and Thickness Measurement with Digital Holographic Microscopy Highlighting and Its Tomographic Capacity
Description
The refocusing capacity is a unique feature of digital holography. In this chapter, we show the capability of reconstructing digital holograms at different planes for different purposes. One of such purposes is to increase the focus depth of the microscope system. First, we show experimental results of the feasibility to perform digital holographic microscopy (DHM) using a Mirau interferometric objective. A profile phase comparison of a 4.2 μm high microlens using interferometry and DHM, extending the depth of focus of the microscope objective as proof of the proposal, is presented. Second, it is also useful in reducing shot noise when using an LED as a light source. In order to attain the reduction noise, we performed an averaging process of phase and amplitude images reconstructed at different reconstruction distances. This reconstruction range is performed within the focus depth of the optical system. We get a reduction of 50% shot noise. Finally, we show a strategy based on this tomographic capability of reducing a ringing effect by using an ideal filter in off‐axis digital holography.
Chapter