Kubota Holography Laboratory Corporation

Uji, Japan

Kubota Holography Laboratory Corporation

Uji, Japan
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Kakue T.,Kyoto Institute of Technology | Moritani Y.,Kyoto Institute of Technology | Ito K.,Kyoto Institute of Technology | Shimozato Y.,Kyoto Institute of Technology | And 5 more authors.
Optics Express | Year: 2010

We propose an algorithm that can improve the quality of the reconstructed image from the single hologram recorded by the optical system of the parallel four-step phase-shifting digital holography. The proposed algorithm applies the image-reconstruction algorithm of parallel two-step phase-shifting digital holography to the hologram so as to reduce errors in the reconstructed image and eliminate ghosts. We numerically and experimentally confirmed that the proposed algorithm decreased 25% in terms of root mean square error in amplitude, and eliminated the ghosts, respectively. ©2010 Optical Society of America.


Tahara T.,Kyoto Institute of Technology | Tahara T.,Japan Society for the Promotion of Science | Shimozato Y.,Kyoto Institute of Technology | Awatsuji Y.,Kyoto Institute of Technology | And 4 more authors.
Optics Letters | Year: 2012

We propose a single-shot digital holography in which the complex amplitude distribution is obtained by spatialcarrier phase-shifting (SCPS) interferometry and the correction of the inherent phase-shift error occurred in this interferometry. The 0th order diffraction wave and the conjugate image are removed by phase-shifting interferometry and Fourier transform technique, respectively. The inherent error is corrected in the spatial frequency domain. The proposed technique does not require an iteration process to remove the unwanted images and has an advantage in the field of view in comparison to a conventional SCPS technique. © 2012 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 | 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 | 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.


Kakue T.,Kyoto Institute of Technology | Tosa K.,Kyoto Institute of Technology | Yuasa J.,Kyoto Institute of Technology | Tahara T.,Kyoto Institute of Technology | And 4 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2012

We succeeded in digital light-in-flight recording by holography by use of a femtosecond pulsed laser. We recorded and reconstructed a moving picture of femtosecond light pulse propagation on a diffuser plate on which a test chart pattern was printed. A mode-locked Ti:sapphire laser was used as a femtosecond pulsed laser. The center wavelength and the duration of the light pulse were 800nm and 96 fs, respectively. We conducted a numerical simulation in order to validate the proposed technique. We confirmed that the technique was capable of recording the moving picture of femtosecond light pulse propagation. In addition, we experimentally demonstrated the technique and successfully observed femtosecond light pulse propagation for 576 fs. The experimental results agreed well with the simulation results. © 2006 IEEE.


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

We propose parallel phase-shifting digital holographic microscopy (PPSDHM) which has the ability of three-dimensional (3-D) motion measurement using space-division multiplexing technique. By the PPSDHM, instantaneous information of both the 3-D structure and the phase distributions of specimens can be simultaneously acquired with a single-shot exposure. We constructed a parallel phase-shifting digital holographic microscope consisting of an optical interferometer and an image sensor on which micro polarizers are attached pixel by pixel. The validity of the PPSDHM was experimentally verified by demonstrating the single-shot 3-D imaging and phase-imaging ability of the constructed microscope. © 2010 Optical Society of America.


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.


Kakue T.,Kyoto Institute of Technology | Kakue T.,Japan Society for the Promotion of Science | Itoh S.,Kyoto Institute of Technology | Xia P.,Kyoto Institute of Technology | And 7 more authors.
Optics Express | Year: 2012

Parallel phase-shifting digital holography is capable of three-dimensional measurement of a dynamically moving object with a singleshot recording. In this letter, we demonstrated a parallel phase-shifting digital holography using a single femtosecond light pulse whose central wavelength and temporal duration were 800 nm and 96 fs, respectively. As an object, we set spark discharge in atmospheric pressure air induced by applying a high voltage to between two electrodes. The instantaneous change in phase caused by the spark discharge was clearly reconstructed. The reconstructed phase image shows the change of refractive index of air was -3.7 × 10-4. © 2012 Optical Society of America.

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