Phase-shifting digital holography using two low-coherence light sources with different wavelength

To observe an object shape in a light scattering medium, the low-coherence interferometry exercises its power to omit undesired light derived from multiple-light scattering. The phase-shifting digital holography is used to obtain the complex amplitude of the object from a few interference patterns. When the object has a height difference more than the wavelength of a light source, the obtained phase distribution has 2π ambiguity. Therefore, a phase-unwrapping technique is required to contour the object surface. When an object is in light-scattering media, the interference signal has much noise originating from multiple-light scattering, and therefore the phase unwrapping becomes harder. Two-wavelength interferometry set free from the unwrapping procedure. We propose a new method based on a combination of the phase-shifting digital holography, the two-wavelength interferometry, and the low-coherence interferometry. We demonstrate a topographic imaging of an object in light scattering media.

[1]  Yimei Zhu,et al.  Fast phase unwrapping algorithm for interferometric applications. , 2003, Optics letters.

[2]  I. Yamaguchi,et al.  Three-dimensional microscopy with phase-shifting digital holography. , 1998, Optics letters.

[3]  Katharine Grieve,et al.  Full-field optical coherence microscopy , 2004, Advanced Laser Technologies.

[4]  G Indebetouw,et al.  Imaging through scattering media with depth resolution by use of low-coherence gating in spatiotemporal digital holography. , 2000, Optics letters.

[5]  B Javidi,et al.  Three-dimensional object recognition by use of digital holography. , 2000, Optics letters.

[6]  Munther A Gdeisat,et al.  Robust, fast, and effective two-dimensional automatic phase unwrapping algorithm based on image decomposition. , 2002, Applied optics.

[7]  M. Akiba,et al.  Full-field optical coherence tomography by two-dimensional heterodyne detection with a pair of CCD cameras. , 2003, Optics letters.

[8]  R R Alfano,et al.  Imaging objects hidden in highly scattering media using femtosecond second-harmonic-generation cross-correlation time gating. , 1991, Optics letters.

[9]  Munther A. Gdeisat,et al.  Fast two-dimensional phase-unwrapping algorithm based on sorting by reliability following a noncontinuous path. , 2002, Applied optics.

[10]  J. Schuman,et al.  Optical coherence tomography. , 2000, Science.

[11]  I. Yamaguchi,et al.  Surface Shape Measurement by Phase-Shifting Digital Holography , 2001, Applied optics.

[12]  R Birngruber,et al.  Contrast limits of coherence-gated imaging in scattering media. , 1997, Applied optics.

[13]  Hirotsugu Yamamoto,et al.  Hiding an image with a light-scattering medium and use of a contrast-discrimination method for readout. , 2004, Applied optics.

[14]  I. Yamaguchi,et al.  Phase-shifting digital holography. , 1997, Optics letters.

[15]  R Birngruber,et al.  Low-coherence optical tomography in turbid tissue: theoretical analysis. , 1995, Applied optics.

[16]  J. Wyant,et al.  Multiple-wavelength phase-shifting interferometry. , 1985, Applied optics.

[17]  J. Gass,et al.  Phase imaging without 2pi ambiguity by multiwavelength digital holography. , 2003, Optics letters.