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Optical Engineering

Influence of aberrations in microholographic recording
Author(s): Ryuichi Katayama
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Paper Abstract

The influence of various types of aberrations (spherical, coma, and astigmatic) of recording and readout beams on the readout signal in a microholographic recording was investigated through a numerical simulation. 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 aberrations was less than half of the Maréchal’s criterion. Moreover, when the RMS wavefront aberrations of the recording 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/μm3 (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.

Paper Details

Date Published: 6 November 2015
PDF: 11 pages
Opt. Eng. 54(11) 117104 doi: 10.1117/1.OE.54.11.117104
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Ryuichi Katayama, Fukuoka Institute of Technology (Japan)

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