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Tahara T.,Kyoto Institute of Technology | Tahara T.,Japan Society for the Promotion of Science | Awatsuji Y.,Kyoto Institute of Technology | Shimozato Y.,Kyoto Institute of Technology | And 6 more authors.
Optics Letters | Year: 2011

We propose single-shot digital holography which is capable of simultaneously capturing both the information of multiple phase-shifted holograms and the distribution of the polarization. In this technique, a single image sensor records both the information required for phase-shifting interferometry and that of the polarization states of objects using an array of polarizers. The essence of the technique is the capability of imaging the distribution of the polarization of three-dimensional objects with a single-shot exposure by using the space-division multiplexing of holograms. The validity of the proposed technique was confirmed by the preliminary experiments. © 2011 Optical Society of America.


Kakue T.,Kyoto Institute of Technology | Yonesaka R.,Kyoto Institute of Technology | Tahara T.,Kyoto Institute of Technology | Awatsuji Y.,Kyoto Institute of Technology | And 4 more authors.
Optics Letters | Year: 2011

Parallel phase-shifting digital holography can obtain three-dimensional information of a dynamically moving object with high accuracy by using space-division multiplexing of multiple holograms required for phase-shifting interferometry. We demonstrated high-speed parallel phase-shifting digital holography and obtained images of the phase variation of air caused by a compressed gas flow sprayed from a nozzle. In particular, we found the interesting phenomenon of periodic phase distributions. Reconstructed images were obtained at frame rates of 20,000 and 180,000 frames per second. © 2011 Optical Society of America.


Tahara T.,Kyoto Institute of Technology | Ito K.,Kyoto Institute of Technology | Fujii M.,Kyoto Institute of Technology | Kakue T.,Kyoto Institute of Technology | And 6 more authors.
Optics Express | Year: 2010

Parallel two-step phase-shifting digital holography is a technique for single-shot implementation of phase-shifting interferometry and requires only the intensity distribution of the reference wave and spatial two phaseshifted holograms. We constructed a system of parallel two-step phaseshifting digital holography and experimentally demonstrated the technique, for the first time. The system uses an originally fabricated image sensor having an array of 2 × 1 micro polarizers. Each micro polarizer was attached on pixel by pixel. In the experiment, the unwanted images, the zero-order diffraction wave and the conjugate image, are removed from the reconstructed image of objects by the system, while the images superimpose on the image of objects reconstructed by Fresnel transform alone. Also the capability of single-shot and three-dimensional imaging is demonstrated by the system. © 2010 Optical Society of America.


Tahara T.,Kyoto Institute of Technology | Yonesaka R.,Kyoto Institute of Technology | Yamamoto S.,Kyoto Institute of Technology | Kakue T.,Kyoto Institute of Technology | And 7 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2012

We succeeded in 3-D motion-picture imaging for dynamic motion of biological objects swimming at different depths by parallel phase-shifting digital holographic microscopy (PPSDHM). PPSDHM is a technique for high-quality instantaneous 3-D imaging of specimens in the microscopic field of view by single-shot recording of multiple phase-shifted holograms. We constructed a PPSDHM for recording high-speed dynamic phenomena and then motions of biological objects in water were recorded at 20000 and 150000 frames/s, respectively, which is the fastest among the previous reports on 3-D imaging of biological objects. © 2012 IEEE.


Tahara T.,Kyoto Institute of Technology | Tahara T.,Japan Society for the Promotion of Science | Awatsuji Y.,Kyoto Institute of Technology | Nishio K.,Kyoto Institute of Technology | And 3 more authors.
Applied Physics Express | Year: 2013

We propose a single-shot digital holography in which the space bandwidth available for recording an object wave can be extended in an off-axis configuration. The key points of this technique are utilizing the periodicity of a digital signal and the undersampling, intentionally setting the aliasing to the recorded hologram, and conducting spatial-carrier phase-shifting interferometry and the Fourier transform method. The image quality for both large objects and fine structures can be improved by the keys. The effectiveness of the proposed technique was numerically and experimentally demonstrated. Then, the performance and the optimal angle condition were quantitatively analyzed. Copyright © 2013 The Japan Society of Applied Physics.

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