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C-OCLI provide following type
of filters
¡¡
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1. |
Interference Filters |
Narrow band (¡À10nm)
,Broadband (¡À50nm and
¡À80nm), it has
extremely angle
sensitive, so carefully mounting is
necessary. The highly selective reduce the
throughput of the peak wavelength
significantly. |
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2. |
Color Substrate Filters |
They are often used for longpass and
bandpass filters, coated substrate cemented
with color glass which have different
absorption and transmission properties
across the spectrum. |
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3. |
Dichroic Filters |
Substrate are coated with thin-films
to acquire the desired transmission and
reflection characteristics across the
spectrum. |
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4. |
Neutral density Filters |
It often used to prevent blooming or
overexposure of cameras and other detectors.
they are designed to reduce transmission
evenly across a portion of the spectrum .
Two types: absorptive and reflective. |
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5. |
Longpass Filters |
A filter in which the passband is a
wavelength rang higher than the wavelength
range that is blocked. |
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6. |
Shortpass filters |
A filter in which the passband is a
wavelength rang lower than the wavelength
range that is blocked. it include IR cutoff
filters, hot mirror, and heat absorbing
filters. |
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Optical Filter
Specifications |
Please give us
following specification form for order: |
Following is a hort
review of filter specifications to
assist you in formulating requirements
for your particular application.
Center wavelength
Center wavelength (CWL) is the
arithmetic mean of the pass band
expressed in nanometers. For example, a
HeNe filter would have a center
wavelength of 632.8nm. Center Wavelength
tolerance: ¡À FWHM
Percent Transmission
Percent transmission is the amount of
power received by the detector compared
to the total power received.
Bandpass
It is the width of the pass band,
measured in nm, at the half-power points
of the pass band. It is often expressed
as Full Width at Half maximum (FWHM).
Tolerance: ¡À20%
of FWHM.
Bandpass shape
It can vary from triangular to nearly square. The number of cavities
in a filter describes the overall
spectral shape.
Out-of-band rejection
out-of-band rejection (Blocking), is the
amount of the energy , outside the
filter pass band, transmitted through
the filter. it is often expressed as an
absolute level.
For example 10-4 , means
transmission outside the pass band is
0.01% , Unit: Optical Density (O.D.).
Filter Dimension
Filter dimension are specified in inches
or millimeter along with tolerance. such
as 25.4mm §¶, thickness: 6.35mm.
Environmental Considerations
Humidity: MIL-STD-810C
Adhesion: MIL-C-48497 tape test
Surface Quality: 80-50 scratch-dig. |
Center
Wavelength:_________Tolerance____________
FWHM____________________Tolerance____________
Percent Transmission:_______Tolerance____________
Size:
Dimension___________Tolerance____________
Thickness___________Tolerance____________
Blocking:
Short side____nm to
pass band_____ level____
Long side pass band to______nm
level____________
Surface QUality________________________________
Angle of
incidence______________________________
Parallelism____________________________________
Temperature
range_____________________________
Humidity______________________________________
C-OCLI ' s filter are designed for
operation at 23 degrees Celsius, these
filters can be used throughout the
temperature range of -50 to +100 degrees
Celsius as long as thermal shock is
avoided. |
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IR cutoff filter :
Common light sources delivery
light that has a very broad spectral
output reaching beyond visible,
many visual and detector-based
applications call for a filter that is
designed to pass only light within the
visible spectrum. C-OCLI provide IR
cutoff filter with volume-produce.
(see the curve left) |
Narrow
Bandpass Interferencefilters
Specifications:
Central Wavelength (CWL) Tolerance:
¡À2nm
Full width-half Maximum (FWHM): 10nm
Operating Temp.Range: -10¡ã
C to +70¡ã
C
Surface Quality: 80-50
Blocking: 100 nm to 1200nm
Application: Water and environmental
testing, clinical chemistry,
colorimetry, photometry, laser and
lEDs.
¡¡ |
C-OCLI provide following typical
Narrow Bandpass filter:
CWL(nm) 334 337 340 365
394 400 405 410 415 420
430 436 436 442 450 455 458
467 470 480
486 488 492 500 505 508 510
515 520 532
535 540 546 550 568 580 589
600 610 620
632 636 640 647 650 656 671
676 690 694
730 766 780 800 830 852 855
880 905 940
1064 |
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