Collinear technology for holographic versatile disc (HVD) system

Diffraction Property of Collinear Holographic Storage System

“…( [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], it shows that the PSF is related to the auto-correlation function of the reference pattern times a defocusing phase term. Accordingly, a lens array used as the reference is introduced.…”

“…(1-13) and Eq. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). When the disk shifts, based on VOHIL model, the optical field diffracted from specific layer at a depth (Δz) can be expressed (1-31)…”

“…The first is to calculate the point spread function (PSF) through Bragg mismatch [10,11]; the second is to apply Fresnel transform to simulate the light field in the recording disc and through Born's approach or the method called "volume hologram being an integrator of the lights emitted from elementary light sources" (VOHIL) to calculate the diffraction pattern on the CCD plane [12][13][14][15]. The procedures of the approaches are described in detaisl from Refs.…”

Wavelength and defocus margins of the collinear holographic storage system

“…Paraxial equations to describe the point spread function of collinear holographic storage structure have also been reported [9] . In order to produce a practical system, system margins are experimentally investigated [10] . Experimental studies show that the wavelength margin of collinear holography is over 3 times larger than that of the conventional 2-axis holography at the same media thickness [11] and the defocus margin of collinear technology is over six times larger than that of DVD's specification [10] .…”

“…In order to produce a practical system, system margins are experimentally investigated [10] . Experimental studies show that the wavelength margin of collinear holography is over 3 times larger than that of the conventional 2-axis holography at the same media thickness [11] and the defocus margin of collinear technology is over six times larger than that of DVD's specification [10] . In addition, the shift selectivity in the optical axis direction and the wavelength margin have also been numerical discussed [12] .…”