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• Magneto-Optic
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Ultra Density Optical - Magneto-optical comparison
1 The table below summarizes the differences between conventional
Magneto-Optical specifications and those of the enhanced
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Magneto-optic Kerr effect
1 In physics the 'magneto-optic Kerr effect' (MOKE) or the surface
magneto-optic Kerr effect (SMOKE) is one of the magneto-optic effects. It
describes the changes to light reflected from a magnetized surface.
It is used in materials science research in devices such as the Kerr
microscope, to investigate the magnetization structure of materials.
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Magnetic storage - Magneto-optical recording
1 Magneto-optical recording writes/reads optically. When writing, the magnetic medium is heated
locally by a laser, which induces a rapid decrease of coercive field. Then, a small magnetic field can be used to switch the
magnetization. The reading process is based on magneto-optical Kerr effect. The magnetic
medium are typically amorphous R-FeCo thin film (R being a rare earth element). Magneto-
optical recording is not very popular. One famous example is MiniDisc|Minidisc developed
by Sony.
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Magneto-optic effect
1 The results of reflection from a magneto-optic material are known as the magneto-optic Kerr effect (not to
be confused with the nonlinear optics|nonlinear Kerr effect).
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Magneto-optic effect
1 In general, magneto-optic effects break time reversal symmetry locally (i.e.
when only the propagation of light, and not the source of the magnetic field, is
considered) as well as Lorentz reciprocity, which is a necessary
condition to construct devices such as Faraday isolator|optical isolators
(through which light passes in one direction but not the other).
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Magneto-optic effect - Gyrotropic permittivity
1 In particular, in a magneto-optic material the presence of a magnetic
field (either externally applied or because the material itself is
ferromagnetism|ferromagnetic) can cause a change in the permittivity
tensor ε of the material
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Magneto-optic effect - Gyrotropic permittivity
1 where \chi^ \! is the magneto-optical susceptibility (a scalar (physics)|scalar in
isotropic media, but more generally a tensor). If this susceptibility itself
depends upon the electric field, one can obtain a nonlinear optics|nonlinear optical
effect of magneto-optical parametric generation (somewhat analogous to a
Pockels effect whose strength is controlled by the applied magnetic field).
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Magneto-optical drive
1 A 'magneto-optical drive' is a kind of optical disc drive capable of writing
and rewriting data upon a 'magneto-optical disc'
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Magneto-optical drive - Technical aspects
1 During reading, a laser projects a beam on the disk and, according to the magnetic state of the surface,
the reflected light varies due to the Magneto-optic Kerr effect
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Magneto-optical drive - Technical aspects
1 By default, Magneto-optical drives verify information after writing it to the disc, and
are able to immediately report any problems to the operating system. This means writing
can actually take three times longer than reading, but it makes the media extremely reliable, unlike the CD-R or DVD-R media upon which data is written without any
concurrent data integrity checking. Using a magneto-optical disc is much more like using
a diskette drive than a CD-RW drive.
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Magneto-optical drive - Technical aspects
1 Progress in magneto-optical technology received a boost in the spring of 1997 with the launch of
Plasmon’s DW260 drive. This used LIMDOW technology|Light Intensity
Modulated Direct OverWrite technology to achieve an increased level of performance over previous
magneto-optical drives.
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Magneto-optical drive - Vendors
1 Sony MiniDiscs are magneto-optical, and Sony produces many other formats of magneto-
optical media.
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Magneto-optical drive - Vendors
1 A current model is the T7-9100 drive, which has a maximum capacity of 9.1GB and is downward read and
write compatible with 5.2GB, 4.8GB, 4.1GB, 2.6GB, and 2.3GB magneto-optical disks, and read compatible
with 1.3GB, 1.2GB, 650MB, and 600MB magneto-optical disks
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Magneto-optical drive - Vendors
1 Fujitsu was a major manufacturer of 90mm magneto-optical drives,
exceeding 2 GB in capacity, but they have discontinued production and
sale of this product category.
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Magneto-optical drive - Vendors
1 PDO Konica Minolta was the last manufacturer of 90mm 3.5 magneto-optical drives. They had a 3.5 1.3GB USB external pocket drive available
for sale in the United States and Europe. Sources for this drive are, in
the United States [http://www.maxoptix.com/3-5-mo-
drives maxoptix.com].
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Magneto-optical drive - Floptical drives
1 Magneto-optical drives should not be confused with Floptical drives, which likewise combine ferromagnetic and
optical technologies, albeit in a different manner
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Magneto-optical drive - Recent progress
1 As with all removable storage media, the advent of cheap CD/DVD drives and flash memory has made them
largely redundant. Magneto-optical disks in particular were expensive
when new, and while highly reliable, the slow writing time also was a
detriment.
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Magneto-optical trap
1 A 'magneto-optical trap' (abbreviated 'MOT') is an apparatus
that uses laser cooling with magneto-optical trapping in order to produce samples of cold, trapped, neutral atoms at temperatures as low as several microkelvins, two or
three times the recoil limit (see Doppler cooling limit).
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Magneto-optical trap - Atomic structure necessary for magneto-optical trapping
1 The magneto-optical trapping of rubidium 85, for example, involves cycling on the closed 5S1/2 F=3 →
5P3/2 F=4 transition
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Magneto-optical trap - Laser
1 All magneto-optical traps require at least one trapping laser plus any necessary repumper lasers (see
above)
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Magneto-optical trap - Laser
1 By employing a 2-dimensional diffraction grating it is possible to
generate the configuration of laser beams required for a magneto-
optical trap from a single laser beam and thus have a very compact
magneto-optical trap.Nshii et al.
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Magneto-optical trap - Vacuum chamber
1 However, the trapping potential in a magneto-optical trap is small in
comparison to thermal energies of atoms and most collisions between trapped atoms and the background gas supply enough energy to the trapped atom to kick it out of the
trap
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Magneto-optical trap - The limits to the magneto-optical trap
1 The minimum temperature and maximum density of a cloud in a magneto-optical trap is limited by
the spontaneously emitted photon in cooling each cycle
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Magneto-optical trap - Application
1 A magneto-optical trap is usually the first step to achieving Bose–Einstein condensation. Atoms are cooled in a MOT down to a few times the recoil limit, and then evaporative cooling|evaporatively cooled which lowers the temperature and increases the density to the required phase space
density.
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Magneto-optical - Technical aspects
1 Progress in magneto-optical technology received a boost in the spring of 1997 with the launch of
Plasmon's DW260 drive. This used LIMDOW technology|Light Intensity
Modulated Direct OverWrite technology to achieve an increased level of performance over previous
magneto-optical drives.
https://store.theartofservice.com/the-magneto-optic-toolkit.html
Magneto-optical - Vendors
1 From to , Nintendo sold the Nintendo 64 video game console's 64DD
peripheral to Japan, based mainly upon a 64MB magneto-optical drive, with various types of read-only and
read/write media.
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Magneto-optical - Vendors
1 A current model is the T7-9100 drive, which has a maximum capacity of 9.1GB and is downward read and
write compatible with 5.2GB, 4.8GB, 4.1GB, 2.6GB, and 2.3GB magneto-optical disks, and read compatible
with 1.3GB, 1.2GB, 650MB, and 600MB magneto-optical disks
https://store.theartofservice.com/the-magneto-optic-toolkit.html
Magneto-optical - Vendors
1 Fujitsu was a major manufacturer of 90mm magneto-optical drives,
exceeding 2GB in capacity, but they have discontinued production and
sale of this product category.
https://store.theartofservice.com/the-magneto-optic-toolkit.html
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