International Symposium on Optical Memory and Optical Data Storage Topical Meeting
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Holographic storage - elegant technology, elusive product
- Trang 138-140
This article gives a review of holographic data storage, and covers such topics as: history and development; technological issues; recording media; recording and recreation systems; future outlook and prospects.
#Holography #Photorefractive materials #Optical materials #Optical recording #Optical distortion #Optical modulation #Holographic optical components #Liquid crystal displays #Sensor arrays #Costs
Adaptive signal processing method using PRML for high density optical disks
- Trang 108-110
Numerous types of DVD recording equipment have emerged on the market, and there is much demand for such optical storage systems with high speed and large capacity for digital high definition broadcasts. However, it becomes difficult to maintain data reliability with increasing recording speed and density, because the signal to noise ratio degrades and recording control of the phase changed mark be...... hiện toàn bộ
#Adaptive signal processing #Adaptive optics #Optical signal processing #Optical recording #High definition video #High speed optical techniques #Disk recording #Maximum likelihood decoding #DVD #Digital recording
Optical, thermal, and materials aspects of short laser pulses for optical data storage
- Trang 123-125
Sub-nanosecond laser pulses are attractive for optical data storage because of their efficient delivery of optical power and mitigation of thermal conduction effects, thus enabling media designs for superfast cooling. We review the technology of short-pulse lasers, and discuss the potential of short-pulse data recording.
#Optical materials #Optical pulses #Memory #Optical recording #Conducting materials #Power lasers #Thermal conductivity #Optical design #Cooling #Disk recording
Effect of thickness and crystallization on the optical energy gap of some chalcogenide phase-change thin films
- Trang 99-101
The chalcogenide GeSbTe semiconductor compounds are widely used in rewritable optical disk systems such as CD-RW, PD and DVD-RAM. The readout and write/erase properties are strongly dependent on the optical constants (refractive index n and extinction coefficient k, absorption coefficient a) of the phase-change layer. Therefore, the accurate determination of the optical constants of these material...... hiện toàn bộ
#Optical films #Crystallization #Optical refraction #Optical variables control #Optimized production technology #Absorption #Semiconductor thin films #Refractive index #Extinction coefficients #Optical materials
An optical flying head system that features a dual-stage tracking mechanism for use in high-density MO recording
- Trang 40-42
Much research work has recently been carried out on increasing the recording density on a first-surface optical disk using the combination of a blue-violet laser diode and high-NA lens. In order to achieve higher recording densities for removable magneto-optical (MO) disks, an optical flying head (OFH) with an integrated magnetic field modulation (MFM) coil and high-NA lens has been developed. The...... hiện toàn bộ
#Optical recording #Magnetic heads #Magnetooptic recording #Disk recording #Optical modulation #Lenses #Diode lasers #Integrated optics #Magnetic fields #Magnetic modulators
Physical characteristics and format of a two-inch-diameter magneto-optical disk system with 3-GB capacity
- Trang 42-44
A small and high-density rewritable optical disk has been anticipated for mobile devices. A two-inch-diameter magneto-optical disk system, which adopts a DWDD (domain wall displacement detection) and sampled servo technique, was reported in a previous work (T. Shiratori et al, J. Magn. Soc. Jpn., vol. 22, supp. no. S2, pp. 47-50, 1998; M. Birukawa et al, Proc. MORIS2002). This paper describes the ...... hiện toàn bộ
#Servomechanisms #Cities and towns #Automatic voltage control #Magnetooptic recording #Delta modulation #Magnetic cores #Optical devices #Optical crosstalk #Magnetooptic devices #Laser theory
Small form factor optical drive: miniaturized plastic high-NA objective and optical drive
- Trang 251-253
Recent developments in portable consumer devices call for storage systems solutions using compact drive units and cheap storage media. A major advantage of conventional optical storage is the intrinsic low media cost and the ease of manufacturing of replicated ROM media. Third generation optical storage, using a blue laser and a high numerical aperture objective lens, is a perfect technology candi...... hiện toàn bộ
#Plastics #Drives #Optical recording #Laser beam cutting #Optical devices #Costs #Read only memory #Lenses #Sputtering #Geometrical optics
Improved dimensional stability of asymmetric structures for media applications
- Trang 105-107
A simple dimensional stability model is used to identify the relevant material, geometric and environmental parameters critical for warpage of high-density optical media structures. Asymmetry in the system disk geometry gives rise to a transient dimensional stability, i.e. curvature in the cover layer is induced by changes in the surrounding environment. Humidity and temperature changes will induc...... hiện toàn bộ
#Stability #Water #Material properties #Assembly systems #Capacitive sensors #Predictive models #Geometrical optics #Geometry #Temperature dependence #Strain measurement
Experimental effects of laser power on the writability and PW/sub 50/ in a heat assisted longitudinal recording system
- Trang 162-164
In a heat assisted magnetic recording (HAMR) system, light from a laser diode is used to heat the medium which assists in the recording process by temporarily reducing the coercivity during writing. The recorded marks are read back using a magnetoresistive (MR) sensor that senses the stray flux from a magnetic transition. In this paper we examine the effects of the laser power on the writability a...... hiện toàn bộ
#Power lasers #Heat-assisted magnetic recording #Magnetic recording #Diode lasers #Coercive force #Writing #Magnetoresistance #Magnetic sensors #Magnetic flux #Laser transitions
Electron beam recording with a novel differential pumping head realizing over 50 GB/layer capacity disc
- Trang 18-20
High density mastering is the key technology to manufacture next generation optical disc recording with over 20 GB capacity for more than 2 hours of HDTV digital data. We developed a deep UV laser beam recorder (DUV-LBR) and the related mastering process to achieve such a high density (M. Takeda et al, Jpn. J. Appl. Phys. vol. 38, pp. 1837-1838, 1999), which is now to be introduced in the disc mas...... hiện toàn bộ
#Electron beams #Disk recording #Magnetic heads #Optical recording #Atmosphere #Resists #Manufacturing #Electron optics #High speed optical techniques #Optical pumping