Abstract
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.
Highlights
The point diffraction interferometer (PDI) is a self-referencing interferometer wavefront sensor (SRI WFS) with high spatial resolution, because each pixel corresponds to a sub-aperture in the interferogram
In the PDI, a 60 μm pinhole is used, which equals about 60% of the Airy disk for unaberrated wave, namely 1.46λ f /D, where f (250 mm) is the focal length of L1 and L2 in Figure 1, λ (632.8 nm) is the laser wavelength, and D (4.61 mm) is the aperture size
This paper has presented a new quasi-common path PDI to extract the wavefront phase from a carrier frequency fringe pattern
Summary
College of Mechanical Engineering, Inner Mongolia University of Technology, Huhhot 010051, China College of Mechanical Engineering, Inner Mongolia University of Technology, Huhhot 010051, China Robotics and Microsystems Center, Soochow University, Suzhou, 215021,China College of Mechanical Engineering, Inner Mongolia University of Technology, Huhhot 010051, China College of Information Engineering, Inner Mongolia University of Technology, Huhhot 010080, China. 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 with a compact circular optical setup, reference and measurement waves are obtained. A linear tilting modulation is added into two interfering waves and adjusted by tilting the polarizing beam splitter - and 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.
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