Compact magnetooptical disk for coded data storage

Ojima, Masahiro; Saito, Atsushi; Kaku, Toshimitsu; Ito, Masaru; Tsunoda, Yoshito; Takayama, S.; Sugita, Y.

doi:10.1364/ao.25.000483

Cited by 41 publications

(9 citation statements)

References 3 publications

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“…Some application examples include free-space optical switching networks, [1][2][3] readwrite magneto-optical data storage systems, 4,5 and polarization-based imaging systems. 6,7 In these systems, a polarizing beam splitter (PBS) is an essential element for separating two orthogonally polarized light beams.…”

Section: Introductionmentioning

confidence: 99%

Design, fabrication, and characterization of form-birefringent multilayer polarizing beam splitter

et al. 1997

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Polarizing beam splitters that use the anisotropic spectral reflectivity (ASR) characteristic of high-spatialfrequency multilayer binary gratings have been designed, fabricated, and characterized. Using the ASR effect with rigorous coupled-wave analysis, we design an optical element that is transparent for TM polarization and reflective for TE polarization at an arbitrary incidence angle and operational wavelength. The experiments with the fabricated element demonstrate a high efficiency (Ͼ97%), with polarization extinction ratios higher than 220:1 at a wavelength of 1.523 m over a 20°angular bandwidth by means of the ASR characteristics of the device. These ASR devices combine many useful characteristics, such as compactness, low insertion loss, high efficiency, and broad angular and spectral bandwidth operations.

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Section: Introductionmentioning

confidence: 99%

Design, fabrication, and characterization of form-birefringent multilayer polarizing beam splitter

et al. 1997

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“…The minimization of birefringence is especially critical in the case of magneto-optical systems where the storage mechanism is based on the Kerr effect (see Yoshizawa and Matsubayashi, 1986;Marchant, 1986a;Ojima et al, 1986). In these systems retardation levels in excess of 20-30 nm (double pass) may have a detrimental effect on the carrier-to-noise ratio and other performance measures of the storage device.…”

Section: Introductionmentioning

confidence: 99%

The birefringence problem in optical disk substrates: A modeling approach

1989

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An analytical model has been constructed t o predict the birefringence level in an injuection-molded disk with direct application to optical disk substrates. The model incorporates simplified analyses for the flow in a center-gated cavity during the filling stage, the heat transfer during the cooling stage, and the stress relaxation following the cessation of flow at the end of the filling stage of the injection-molding cycle. The stress relaxation process is analyzed with the integral constitutive equation of Wagner and the residual stresses are converted to retardation via the stress-optical law. Predictions of normal retardation profiles are in line with experimental data and the general effects of melt temperature, mold temperature, and injection speed are closely captured by the model. By contrast, the observed transverse retardation is not in accord with the predicted response. This discrepancy is attributed to the fact that the transverse retardation is induced by cooling stresses and thus cannot be explained in terms of a flow stress mechanism employed in the present analysis.

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“…[5]. They can also be used in polarization-based optical systems such as the ellipsometers, magneto-optic data storage devices, and free-space optical switching networks [6][7][8][9]. A block diagram of BS is sketched in the upper panel of Figure 1, where it has an input and two outputs.…”

Section: Introductionmentioning

confidence: 99%

Design Analysis of a Beam Splitter Based on the Frustrated Total Internal Reflection

Chien

Liu

et al. 2012

PIER

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Abstract-In this work, a theoretical analysis on the design of the beam splitter (BS) based on the frustrated total internal reflection (FTIR) is made. We consider a model structure made of a lowindex gap layer bounded by two high-index layers. In the design of a 50/50 BS, we find that there exists a critical gap thickness which is a decreasing function of the angle of incidence for both T E and T M waves. There also exists a critical wavelength for the incident wave, and it increases with increasing angle of incidence. Finally, at a fixed gap thickness and wavelength of incident wave, the critical angle in T E wave is slightly larger than that of T M wave. The analysis provides some fundamental information that is of particular use to the design of a BS within the framework of FTIR.

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Compact magnetooptical disk for coded data storage

Cited by 41 publications

References 3 publications

Design, fabrication, and characterization of form-birefringent multilayer polarizing beam splitter

Design, fabrication, and characterization of form-birefringent multilayer polarizing beam splitter

The birefringence problem in optical disk substrates: A modeling approach

Design Analysis of a Beam Splitter Based on the Frustrated Total Internal Reflection

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