The influence of various types of aberrations (spherical, coma, and astigmatic) of recording and read- out beams on the readout signal in a microholographic recording was investigated through a numerical simu- lation. The simulation conditions were that the wavelength of the laser was 405 nm and the numerical aperture of the objective lenses was 0.85. The tolerance of the root-mean-square (RMS) wavefront aberrations was defined as the aberration when the normalized signal level decreased to 0.8. Among the three types of aberrations, the influence of the spherical aberration was the most significant. When both the recording and readout beams were aberrated and the signs of the aberrations were in the worst case, the tolerance of the RMS wavefront aberra- tions was less than half of the Marechal's criterion. Moreover, when the RMS wavefront aberrations of the record- ing and readout beams were within the above tolerance, the bit intervals of 0.13 and 0.65 μm in the inplane and vertical directions, respectively, which correspond to the recording density of 91 bit∕μm 3 (recording capacity of 16 TB for a 120-mm-diameter optical disk having a 300-μm-thick recording layer), were shown to be feasible for confocal detection with an allowable signal-to-noise ratio. © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE) (DOI: 10.1117/1.OE.54.11.117104)

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule (Special Issue : Optical Memories)

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Influence of aberrations in microholographic recording

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