Phase-shifting digital holography with a phase difference between orthogonal polarizations is proposed. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously. By combining the holograms with the distributions of a reference wave and an object wave, the complex field of the object's wavefront can be obtained. Preliminary experimental results are shown to confirm the proposed method.

A method to improve the image quality of a digital holographic reconstructed image by means of speckle reduction is proposed. The size and position of the speckles are changed according to the wavelengths to record a digital hologram. By superposing reconstructed images with different wavelengths, the effect of speckle is reduced so that the image quality is improved. Optical experiments are given to confirm the proposed method.

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A polarimetric imaging method of a 3D object by use of on-axis phase-shifting digital holography is presented. The polarimetric image results from a combination of two kinds of holographic imaging using orthogonal polarized reference waves. Experimental demonstration of a 3D polarimetric imaging is presented.

XPS spectra of Co 2p3/2, Fe 2p3/2 and Gd 4d3/2,5/2 of the Gd-Co and Gd-Fe amorphous films were obtained before and after annealing. As a result of the spectral observation, it is known that the oxide of Co and Fe are easily reduced by annealing in a vacuum of 1×10-4 Torr. The depth profiles of Gd-Co film show that Gd segregates to the surface of the film at room temperature. The segregation of highly reactive Gd aids to reduce the oxide of Co and Fe. Based on the experimental data we can explain the effect of annealing on the compensation temperature and, in some extent, support a pair-ordering model of magnetic anisotropy.