Incoherent holographic camera based on Michelson Interferometer

Abstract

Incoherent holography is a hybrid imaging technology with coherent and incoherent processes. Compared with coherent holography, incoherent holography can alleviate coherent noise and speckle noise, and thus achieve higher signal-to-noise ratio. In this article, the incoherent holographic camera based on Michelson interferometer is built, which consists of a telescope, a beam-splitting cube, two plane mirrors, two lenses and a monochromatic charge coupled device. The point spread function (PSF) of the system is determined for the first time according to the Fresnel diffraction theory. Both the simulated and experimental 2D PSFs are coincident with each other. The three-step generalized phase shift interferometry instead of the piezo-actuator is used to eliminate zero-order and twin images. The two one-jiao coins with 15 mm apart and a toy house are recorded under xenon lamp illumination. The reconstructed image clearly demonstrates that the system has the ability to obtain spatial 3D information of an object.

Incoherent digital holographic spectral imaging with high accuracy of image pixel registration*

“…[5][6][7] Incoherent digital holography is free from the dependence of traditional digital holography on coherent light sources, and expands its applications to fluorescence microscopy, [8] color holography, [9][10][11][12][13][14] and adaptive optics. [15,16] By now, many kinds of incoherent digital holography technologies, such as optical scanning holography, [17,18] triangular holography, [19,20] Michelson interferometer type holography, [21,22] and Mach-Zehnder interferometer-type holography [23] have been intensively investigated. Fresnel incoherent correlation holography (FINCH) [24] was first proposed by Joseph Rosen and Gary Brooker in 2007.…”

Two-step phase-shifting Fresnel incoherent correlation holography based on discrete wavelet transform*

“…[6,7] Therefore, the incoherent digital holography technology has been increasingly developed. [8][9][10][11][12] Fresnel incoherent correlation holography (FINCH) originally proposed by Rosen and Brooker [13,14] has developed rapidly and extensively in the field of imaging. [15][16][17][18][19][20] The FINCH presents a factor of about 1.5 in resolution higher than a regular incoherent imaging system with the same NA, but the unwanted direct current (dc) term and twin image are superimposed on the reconstructed image.…”