A point diffraction interferometer with random-dot filter

Furuhashi, Hideo; Shibata, Atsushi; Uchida, Yoshiyuki; Matsuda, Kiyofumi; Grover, C. P.

doi:10.1016/j.optcom.2004.03.077

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…by using a tip or opaque disk having diameter less than half of the Airy disk diameter and positioned at its center. In fact this has been very elegantly achieved by Smartt and Steel [22] with a point-like diffracting aperture and by Furuhashi et al [23] with an opaque disk in the well-known point diffraction interferometer. According to eq.…”

Section: Principle and Theoretical Backgroundmentioning

confidence: 95%

Phase knife-edge laser Schlieren diffraction interferometry with boundary diffraction wave theory

et al. 2007

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Within the framework of boundary diffraction wave theory it has been shown that the first bright fringe on either side of the central dark fringe of the phase knife-edge Fresnel diffraction pattern could be broadened to cover the whole field of view. Broadening of the first diffraction fringe, instead of conventionally modifying the spatial frequency spectrum, enhances the sensitivity of the Schlieren system. The use of phase knife-edge as viewing diaphragm in Schlieren diffraction interferometry not only enhances the fringe contrast but also avoids the loss in phase information as it lets through light from all parts of the test object and its thin interfacing makes the method suitable even for studying weak disturbances.

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Section: Principle and Theoretical Backgroundmentioning

confidence: 95%

Phase knife-edge laser Schlieren diffraction interferometry with boundary diffraction wave theory

et al. 2007

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“…In this case, the lower carrier frequency may increase the number of samples acquired for each fringe period, improving the precision of the final correction result. As a result, the adjustable carrier frequency can be achieved easily in the proposed quasi-common path PDIwhereas it was very difficult in some previous common path PDIs [1,10].…”

Section: Effect Of Carrier Frequency To the Ftmmentioning

confidence: 99%

“…In the case of a given pinhole size and an aberrated phase as shown in Figure 5 From Figure 5(b) it can be deduced that, by varying α, the intensity ratio of the two interfering beams can be adjusted in order to maximize the fringe contrast, which can reach unity in the case of any an input wavefront aberration. As a result, in the proposed common path PDI, the fringe contrast can be adjusted easily -whereas this is very difficult in many previous common path PDI systems [1,4,5,9,10].…”

Section: The Pinhole Diameter and Fringe Contrastmentioning

confidence: 99%

“…The PDI with common-path structure is insensitive to vibration, has long coherence lengths and can minimize the influences of air turbulence or thermal fluctuation. However, traditional common path PDI also has some drawbacks in its difficulty of phase shifting [5] or wavefront extraction, poor realtime measurement and poor technology for making the PDI mask [6]- [8], as well as low fringe contrast [1,4,5,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Simple quasi-common path point diffraction interferometer with adjustable fringe contrast and carrier frequency

Bai

Miao

Guo

et al. 2015

J. Eur. Opt. Soc.-Rapid Publ.

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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.

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“…Going forward with this idea, we herein demonstrate a point-diffraction interferometer (PDI) based on thermally irreversible photochromic materials. The PDI, which is a common path interferometer invented by Linnik in 1933 and further developed by Smartt in the 70s [6], has found a widespread use in the optics industry due to its ease of implementation and operation, stability to vibrations and low sensitivity to air turbulence in comparison to other interferometers [7][8][9][10]. Such features make the PDI the ideal interferometer for an in situ metrology of even very large optics in hard environments.…”

Section: Introductionmentioning

confidence: 99%