Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 10, 2015
|
|
---|---|---|
Article Number | 15042 | |
Number of page(s) | 6 | |
DOI | https://doi.org/10.2971/jeos.2015.15042 | |
Published online | 30 August 2015 |
Regular paper
Simple quasi-common path point diffraction interferometer with adjustable fringe contrast and carrier frequency
1 College of Mechanical Engineering, Inner Mongolia University of Technology, Huhhot 010051, China
2 Robotics and Microsystems Center, Soochow University, Suzhou, 215021, China
3 College of Information Engineering, Inner Mongolia University of Technology, Huhhot 010080, China
* fzbaiim@163.com
** hguo@suda.edu.cn
Received:
5
May
2015
Revised:
24
June
2015
This paper presents a simple quasi-common path point diffraction interferometer (PDI) that allows fringe contrast and fringe spatial frequency to be adjusted conveniently. The novel aspect of this PDI is the use of a polarizer with pinhole as the PDI mask - and then, with a compact circular optical setup, reference and measurement waves are obtained. Furthermore, a linear tilting modulation is added into two interfering waves and adjusted easily by tilting the polarizing beam splitter - and hence the Fourier transform method can be perfectly applied to extract the wavefront phase from the captured fringe pattern, with the highest fringe contrast and suitable carrier frequency. Detailed theoretical analysis and experimental results are presented.
Key words: Phase measurement / point diffraction interferometer (PDI) / fringe contrast / carrier frequency
© The Author(s) 2015. All rights reserved.
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