Recording Experiment with Rotating Optical Head for Magnetooptical Tape Recording System
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Abstract:
For the rotating optical head of an optical tape recorder, whose optics are divided into a fixed part and a rotating part, and whose beam is controlled with a lens in the fixed part, the focusing operation causes a change of both the diameter of the incident beam to an objective lens and the optical magnification. Therefore, we developed an optical system which does not cause these changes and confirmed stable focused-spot characteristics for a ±60 µm displacement of the recording medium by carrying out recording experiments.Keywords:
Optical recording
Optical disc
Light beam
Ag-In-Sb-Te multinary alloy is one of the most challenging materials for use in the phase change recording media. In this investigation, an Ag-In-Sb-Te recording film was sandwiched between two ZnS–SiO 2 layers. And the layer structure of the phase change disc was polycarbonate substrate / ZnS:SiO 2 100 nm / Ag-In-Sb-Te 18 nm / ZnS:SiO 2 20 nm / Al-Cr 95 nm, which was determined from the optical simulation with the results confirmed from the analyses. Finally, a disc with good optical recording properties was performed.
Optical recording
Optical disc
Polycarbonate
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We developed a high-density near-field optical recording disc system using a solid immersion lens. The near-field optical pick-up consists of a solid immersion lens with a numerical aperture of 1.84. The laser wavelength for recording is 405 nm. In order to realize the near-field optical recording disc, we used a phase-change recording media and a molded polycarbonate substrate. A clear eye pattern of 112 GB capacity with 160 nm track pitch and 50 nm bit length was observed. The equivalent areal density is 80.6 Gbit/in 2 . The bottom bit error rate of 3 tracks-write was 4.5×10 -5 . The readout power margin and the recording power margin were ±30.4% and ±11.2%, respectively.
Optical recording
Optical disc
Numerical aperture
Area density
Optical power
Blue laser
Optical storage
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High-speed and high-density recording using blue laser appears to be the main stream for the next generation of phase-change optical disks. Sb-rich phase-change recording materials present one option as a medium for high-speed recording. We have estimated the crystal growth rate (CGR) of two variants of the GeSbTe recording material, for 100 Mbps recording (type 1) and Sb-rich material for 300 Mbps recording (type 2), by comparing the simulation and experimental results. We studied the characteristics of the materials in writing and erasing for high-speed recording. We applied our phase-change simulator (PCS) to search for the relationship between the linear velocity of the rotating disk and the formation of amorphous material in the recording layer. In this study, we used the optical system with NA = 0.85, /spl lambda/ = 405 nm and disks with 320 nm track pitch.
Optical recording
Optical disc
Blue laser
Data recording
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This specification covers the classification and marking of single-lens scopes used in conjunction with archery bows. The lenses are classified in terms of optical magnification, scope markings, and charts of the empirical relationship of the apparent magnification that the consumer can expect to obtain when a correctly marked lens is used under specific conditions. The visual acuity of the lenses is related to the magnification of the lens in general, and is dependent on other factors such as the specific individual, lens quality, and the size of the rear aperture used with the lens. This specification does not go beyond this definition of acuity.
Scope (computer science)
Aperture (computer memory)
Through-the-lens metering
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The development of phase change recording is spurred by the demand of high capacity, low cost and rewritable optical data storage. In phase change optical disk, recording and erasing are achieved by laser heating that induces the crystallographic structural changes in the media. The difference in reflectivities of crystalline and amorphous states determines the information stored. Hence the dependence of optical and thermal effects arising from the laser irradiation on the disk needs to be thoroughly investigated. In today's competitive marketplace, companies are looking into ways of producing better product at lower cost and shorter development time. Thus the capability of performing interactive computer modeling and analyses of the optical disk becomes inevitable to achieve these ends.
Optical disc
Optical recording
Optical storage
Phase-change material
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Zoom lens system is a optical system whose focal length can continuously change but image plane holds stable Zoom lens with all lens elements movable is a new type zoom system and the magnification of every element holds equal The theory of equivalent magnification zoom lens with all lens elements movable is analyzed ,and a series of formula are summarized
Zoom lens
Simple lens
Image plane
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This specification covers the classification and marking of single-lens scopes used in conjunction with archery bows. The lenses are classified in terms of optical magnification, scope markings, and charts of the empirical relationship of the apparent magnification that the consumer can expect to obtain when a correctly marked lens is used under specific conditions. The visual acuity of the lenses is related to the magnification of the lens in general, and is dependent on other factors such as the specific individual, lens quality, and the size of the rear aperture used with the lens. This specification does not go beyond this definition of acuity.
Scope (computer science)
Aperture (computer memory)
Through-the-lens metering
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This specification covers the classification and marking of single-lens scopes used in conjunction with archery bows. The lenses are classified in terms of optical magnification, scope markings, and charts of the empirical relationship of the apparent magnification that the consumer can expect to obtain when a correctly marked lens is used under specific conditions. The visual acuity of the lenses is related to the magnification of the lens in general, and is dependent on other factors such as the specific individual, lens quality, and the size of the rear aperture used with the lens. This specification does not go beyond this definition of acuity.
Scope (computer science)
Aperture (computer memory)
Through-the-lens metering
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Zoom lens
Simple lens
Digital holography
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This chapter contains sections titled: Introduction Phase-Change Overwrite Optical Disc Phase-Change Optical Memory Phenomena The Phase-Change Memory Mechanism Phase-Change Overwriting Method Phase-Change Materials Bonding Features of Chalcogenide Phase-Change Materials Phase-Change Optical Disc Materials for Optical Disc Memory Breakthrough Technologies of the Phase-Change Optical Disc Media Basic Layer Structure Million Overwrite Cycle Phase Change Optical Disc Thin Substrate Technology of Phase Change Optical Disc Promotes DVD High-Density Recording Technologies for Phase Change Optical Discs Short-Wavelength Blue Laser and High Numerical Aperture Lens Recording Dual-Layer Recording Multi-Level Recording Near-Field Recording and Super-RENS Recording High Data Rate, High-Density Recording on Phase-Change Disc Combination Technology Future Directions of the Phase-Change Storage Media Ultra Short Pulse (Femtosecond) Laser Recording Conclusion References
Optical disc
Optical recording
Optical storage
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