Patent ID: 7002691
Filing Date: 2006-02-21
Classification: G01B,G03H

Abstract:
1. A method of recording spatially low-frequency heterodyne hologram including spatially heterodyne fringes for Fourier analysis, comprising: splitting a laser beam into a reference beam and an object beam; interacting the object beam with an object; focusing the reference beam and the object beam at a focal plane of a digital recorder to form a spatially low-frequency heterodyne hologram including spatially heterodyne fringes for Fourier analysis; digital recording the spatially low-frequency heterodyne hologram; Fourier transforming the recorded spatially low-frequency heterodyne hologram including spatially heterodyne fringes and shifting axes in Fourier space to sit on top of a heterodyne carrier frequency defined by an angle between the reference beam and the object beam; cutting off signals around an origin; and performing an inverse Fourier transform.