Single-shot digital holography based on multiwavelength spatial-bandwidth-extended capturing-technique using a reference arm (Multi-SPECTRA) is proposed. Both amplitude and quantitative phase distributions of waves containing multiple wavelengths are simultaneously recorded with a single reference arm in a single monochromatic image. Then, multiple wavelength information is separately extracted in the spatial frequency domain. The crosstalk between the object waves with different wavelengths is avoided and the number of wavelengths recorded with both a single-shot exposure and no crosstalk can be increased, by a large spatial carrier that causes the aliasing, and/or by use of a grating. The validity of Multi-SPECTRA is quantitatively, numerically, and experimentally confirmed.

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Single-shot multiwavelength digital holography using angular multiplexing and spatial bandwidth enhancement is proposed to extend the field of view without the superimposition of undesired images. Angular multiplexing is used to record multiple wavelength information with a single-shot exposure of a monochromatic image sensor.Enlargement of the field of view without the superimposition of undesired images is achieved by designing both the object-wave spectra and angle conditions to obtain wide spatial bandwidths in the respective wavelengths with a high signal-to-noise ratio.Theoretical analyses clarified that the field of view is 1.33 times extended in square by the proposed technique in the case of dual wavelengths. Single-shot, multiple wavelengths, and 3D image recording with both the extended field of view and no superimposition of the 0th-order diffraction wave is experimentally demonstrated while the 0th-order wave remains, and the color-synthesized image is degraded in the conventional technique. Experimental results agree well to the theoretical analysis. . His research interests include holography, digital holography, digital holographic microscopy, interferometry, multispectral 3D imaging, polarization imaging, and high-speed simultaneous fluorescence and holographic imaging.Yuki Takahashi is currently working toward the BS degree in mechanical engineering from Kansai University, Osaka, Japan. His research interests include digital holography.Takuya Komura is currently working toward the BS degree in mechanical engineering from Kansai University, Osaka, Japan. His research interests include digital holography.Toru Kaku received his B.S. degree in mechanical engineering from Kansai University, Osaka, Japan in 2015. He is currently working toward the M.S. degree in mechanical engineering from Kansai University. His research interests include digital holography, digital holographic microscopy, multiwavelength digital holography, multispectral 3D microscopy, and high-speed multimodal holographic imaging.Yasuhiko Arai received the BS and MS degrees in mechanical engineering from Kansai University, Osaka Japan in 1977 and 1979, respectively. In 1988 he received Doctor of Engineering from Osaka University. He is currently a professor in the Mechanical Engineering of Kansai University. His current research interests include a fringe analysis, 3-D measurement using SEM and speckle interferometry, and moiré fringes.

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