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Filter |
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The filter is a
kind of optical elements which to make a
specific wavelength of light to pass through,
and the other wavelength of light reflection or
attenuation. The advantages of the filter having
the high transmittance of the peak value, a flat
pass band spectrum in a wide wavelength range
with good cutoff, and the temperature
stability is better. |
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◆Raman
Spectroscopy Filters |
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Raman
spectroscopy filters
ensures high transmittance of Raman scattering spectrum while
filtering out high-intensity laser. The filters are produced
by the advance ion beam sputtering coating process of Veeco
equipment. |
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Wavelength |
Model |
Types of
filters |
Size (mm) |
Stock status |
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532nm |
532-AAB-54AB-3 |
Laser clean-up filter |
D25.4×2 |
In
stock |
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25.4×25.4×2 |
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12.7×12.7×2 |
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532-LAB-90CB-3 |
Long-pass edge filter |
D25.4×2 |
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25.4×25.4×2 |
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12.7×12.7×2 |
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532-LDAB-50AB-S |
Laser dichroic filter |
25.4×25.4×2 |
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12.7×12.7×2 |
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785nm |
785-AAB-54AB-3 |
Laser clean-up filter |
D25.4×2 |
In
stock |
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25.4×25.4×2 |
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12.7×12.7×2 |
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785-LAB-90AB-4 |
Long-pass edge filter |
D25.4×2 |
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25.4×25.4×2 |
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12.7×12.7×2 |
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785-LDAB-50AB-S |
Laser dichroic filter |
D25.4×2 |
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25.4×25.4×2 |
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12.7×12.7×2 |
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785nm Laser clean-up filter |
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785nm
Ultrasteep long-pass edge filter |
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785nm
Laser dichroic filter |
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◆Linear
Variable Long Wave Pass Filter (LVLWP) |
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The thickness of the coating
layer is not equal on the lens, and the long wave pass
cutoff range shows a gradual change result on the lens.
Commonly used in cutoff of
grating multistage diffraction light, putting before CCD
of optical fiber spectrometer.
The quartz substrate was coated by ion sputtering to
achieve minimum autofluorescence and high laser damage
threshold.
CNI provide
standard model size is 41.4mm×9.5mm×1mm. |
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Spectrometer structure diagram |
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1. |
Connector |
5. |
Focusing mirror |
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2. |
Entrance
slit |
6. |
Continuously variable order sorting filter |
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3. |
Collimating
mirror |
7. |
Line scan detector (CCD) |
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4. |
Grating |
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Test curve |
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◆Notch
Filter |
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Narrow notch filters
are used in Raman
spectroscopy and
instrument
amplifiers to reduce
or prevent audio
feedback, while
having little
noticeable effect on
the rest of the
frequency spectrum.
Other names include
'band limit filter',
'T-notch filter',
'band-elimination
filter', and
'band-reject
filter'.
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Standard
Product |
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Material |
BK7 / K9
/ Fused
Silica |
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Paraxial
Focal
Length |
±2% |
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Centration |
3 arc
minutes |
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Clear
Aperture |
>80% |
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Bevel |
0.25 mm
x 45° |
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Surface
Quality |
20-10/
40-20/
60-40
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Surface
Figure |
l/4@632.8nm |
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Test curve |
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◆Band-pass
Filter |
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The band-pass filter is a kind of optical elements which to
make a specific wavelength of light to pass through, and the
other wavelength of light reflection or attenuation. The
work area is generally in ultraviolet light area, near
infrared area and far infrared area.
Product Application：Mainly
used in the field of biochemical, medical, image
recognition, detection sensors and laser systems.
Material：K9,
Fused
Silica
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◆Cut-off
Filter |
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The cut-off
filters are an
optical device which only permits the transmission of
radiation of wavelengths that are longer than or shorter
than a specified wavelength. CNI
can offer different kinds of cut-off filters upon your
requests. |
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Long Pass Filters,
Ravg ≥99%
from UV to 500 nm, Tavg ≥95%
from 530nm to 1200nm |
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Short Pass Filters,
Ravg ≥99%
from 700 to 900nm, Tavg ≥95%
from 400nm to 680nm, other specs are available on
requests. |
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