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ADVANTAGES
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OPTIONS
ADVANTAGES Stigmatic
imaging
of spectra
by using
an aberration-corrected
concave
diffraction
grating
The
variable
spacing
and curved
groove
ruling
technology,
developed
solely
by Hitachi,
eliminates
the aberrations
inherent
to the
conventional
concave
diffraction
gratings.
This greatly
enhances
the spectral
image
focusing
properties
of concave
gratings.
The Hitachi
aberration
corrected
concave
diffraction
gratings
include
high resolution,
reduced
astigmatism,
compact
size,
etc.,
which
can be
selected
in accordance
with the
function
of the
equipment
to which
they are
applied. 
Mercury
line spectra
The
conventional
concave
grating
images
the spectra
emitted
from a
pinhole
into vertical
straight
lines,
while
the newly
developed
aberration-corrected
concave
grating
images
the spectrum
in the
form of
a point.
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| | OPTIONS From
X-rays
to Infrared!
Gratings
can now
be designed
to meet
specific
requirements
The
diffraction
gratings
that are
capable
of analyzing
a variety
of radiations
ranging
from soft
X-rays
to far
infrared
are now
expanding
their
application
areas
as optical
elements,
indispensable
for spectroscopy.
Conventional
Concave
Gratings
Aberration-Corrected
Concave
Gratings - For
Seya-Namioka
Monochromators
(Coma
Type)
These
gratings
eliminate
the coma-type
aberration
of the
Seya-Namioka
monochromator,
which
has been
most widely
used in
monochromators
with concave
gratings
that provide
high resolution.
Hitachi
is manufacturing
a wide
variety
of aberration-corrected
gratings
for Seya-Namioka
monochromator
which
cover
a wavelength
range
from the
vacuum
ultraviolet
to the
near infrared
region. - For
Compact,
High-Efficiency
Monochromators
These
gratings
are designed
for normal
incidence
mounting.
They reduce
aberrations
and at
the same
time increase
the efficiency
of light
intensity.
As a result,
a high
quality
of image
focusing
of the
concave
grating
is available. - For
Flat-Field
Spectrographs
- Normal
Incidence
Variable
space
grooves
enable
flat-field
image
focusing
of concave
grating
spectrograph.
The spectrograph
permits
simultaneous
measurement
of multi-wavelength
spectra
when combined
with a
linear
array
detector.
These
gratings
are optimized
for normal-incidence
optical
system
(for VIS-UV
ray). - For
Flat-Field
Spectrographs
- Grazing
Incidence
Highly
dispersive
concave
gratings
for grazing-incidence
mounting
are available,
especially
for synchrotron
radiation
and extreme
ultraviolet
applications.
These
gratings
are very
effective
for the
application
of soft
X-rays
whose
reflectance
is extremely
low on
a metal
surface.
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