Hard Coated OD 4,0 Bandpass Filter Kits
• High Transmission with Flat Transmission Profile
• Durable Hard Coatings on a Single Glass Substrate
• Easily Handled and Cleaned
Hard Coated OD 4,0 Bandpass Filter Kits include a variety of optical bandpass filters that are designed for narrowband
to broadband performance in the visible, near-infrared, or infrared wavelength ranges. The included
optical bandpass filters are manufactured using a single glass substrate to remove the potential performance
loss caused by absorbing glass or silver blocking layers, custom dyes, or lamination. Hard Coated OD 4,0
Bandpass Filters Kits are ideal for applications including chemical analysis, bio-imaging, or machine vision.
ENVIRONMENTAL DURABILITY
Humidity: MIL-STD 810.F, Method 507.4
PHYSICAL DURABILITY
Adhesion: MIL-C-48497A, 3.4.1.1
Abrasion: MIL-C-48497A, 3.4.1.3
Temperature: MIL-C-48497A, 3.4.2.1
Cleaning: MIL-C-48497A, 3.4.2.2
10nm Bandpass Filter Kit Curve 400 - 700nm Spectral Range
25nm Bandpass Filter Kit Curve 750 - 1100nm Spectral Range
132 +44 (0) 1904 788600 | Edmund Optics® N NEW PRODUCT NEW LOW PRICE
testing & detection targets illumination cameras imaging lenses microscopy lasers optomechanics optics
TECHNICAL NOTE
Filter Technology & Terminology
TECHNOLOGY
In general, filters either absorb unwanted light through the addition of colored
glasses or dyes, or reflect unwanted light through the addition of interference
coatings. Most EO filters operate on the principal of interference
coatings, with coating designs and materials specially selected to achieve
the desired transmission shape and performance. Hard Coated Optical
Filters feature a single substrate with dense coatings and excellent optical
performance. Designed to meet the adhesion, abrasion, temperature, and
humidity requirements specified in MIL-C-48497A, they are ideal for precision
requirements and OEM integration. Traditional Coated Optical Filters
are typically a stack of absorbing materials, interference coatings, and metallic
layers, laminated together to create a low-cost, efficient filter. The complexity
of the assembly, however, limits both the optical performance and
environmental stability of such filters. Nonetheless, traditional coated filters
are ideal for laboratory equipment and analytical instrumentation. Colored
Glass Filters and other absorbing filters like Plastic Filters and Wratten Filters,
introduce elements, compounds, dyes, or other colorants to a base substrate
to manipulate the filter’s spectral properties. The resulting filters are
relatively inexpensive, but have less desirable optical properties than similar
coated filters. Absorptive filters are typically integrated into illumination and
sensing applications.
TERMINOLOGY
While filters share many of the same specifications with other optical components,
there are a number of specifications unique to filters that should be
understood in order to effectively understand and determine which filter is
best for your application.
Optical Density (OD): Optical Density describes the amount of energy
blocked or rejected by a filter. A high optical density value indicates low
transmission, and low optical density indicates high transmission. Optical
densities of 6,0 or greater are used for extreme blocking needs such as Raman
spectroscopy or fluorescence microscopy. Optical densities of 3,0 - 4,0
are ideal for laser separation and clean-up, machine vision, and chemical
detection, while optical densities of 2,0 or less are ideal for color sorting and
separating spectral orders.
Center Wavelength (CWL): Center Wavelength, used in defining bandpass
filters, describes the midpoint of spectral bandwidth over which the filter
transmits. Traditional Coated Optical Filters tend to achieve a maximum
transmission near the center wavelength, whereas Hard Coated Optical Filters
tend to have a fairly flat transmission profile over the spectral bandwidth.
Full Width-Half Maximum (FWHM): The FWHM describes the spectral
bandwidth over which a bandpass filter will transmit. The upper and
lower limit of that bandwidth is defined at the wavelengths where the filter
achieves 50% of the maximum transmission. For example, if the maximum
transmission of the filter is 90%, the wavelengths at which the filter achieves
45% transmission will define the upper and lower limits of the FWHM.
FWHM’s of 10 nm or less are considered narrowband and often used for
laser clean-up and chemical detection. FWHM’s of 25 - 50 nm are often used
in machine vision applications; FHWM’s of more than 50 nm are considered
broadband and typically used in fluorescence microscopy applications.
Slope: Slope is a specification often defined on edge filters, such as shortpass
or longpass filters, to describe the bandwidth over which the filter transitions
from high blocking to high transmission. Given as the percent of the
cut-wavelength, slope can be specified from a variety of starting and end
points. Edmund Optics® typically specifies the slope as the distance from the
10% transmission point to the 80% transmission point. For example, a 500
nm longpass filter with a 1% slope would be expected to transition from 10%
transmission to 80% transmission over a 5 nm (1% of 500 nm) bandwidth.
TECHSPEC® Hard Coated OD 4,0 Bandpass Filter Kits
Filter
Type
Typical
Applications
Filter
Details
Spectral
Range
Number
of Filters
12,5 mm
Diameter
25 mm
Diameter
50 mm
Diameter
Stock
No. Price Stock
No. Price Stock
No. Price
10 nm
Bandpass
Filter
Kit
Chemical
Analysis,
Laser Diode
Cleanup
Page
134 -
135
266 - 1064 nm 4 Filters (266 nm, 355 nm,
532 nm, 1064 nm) #15-097 €575,00 #15-098 €925,00 #15-099 €2.150,00
400 - 700 nm 7 Filters (50 nm Increments) #88-292 €695,00 #88-299 €1.095,00 #88-306 €2.695,00
25 nm
Bandpass
Filter Kits
LED Cleanup,
Bio-Imaging,
Machine Vision
Page
136
400 - 700 nm 7 Filters (50 nm Increments) #88-293 €695,00 #88-300 €1.095,00 #88-307 €2.695,00
750 - 1100 nm 8 Filters (50 nm Increments) #88-294 €850,00 #88-301 €1.395,00 #88-308 €3.495,00
1150 - 1550 nm 9 Filters (50 nm Increments) #88-295 €1.095,00 #88-302 €1.850,00 #88-309 €4.495,00
50 nm
Bandpass
Filter Kits
Bio-Imaging,
Fluorescence
Microscopy,
Machine Vision
Page
137
400 - 700 nm 7 Filters (50 nm Increments) #88-296 €695,00 #88-303 €1.095,00 #88-310 €2.695,00
750 - 1100 nm 8 Filters (50 nm Increments) #88-297 €850,00 #88-304 €1.395,00 #88-311 €3.495,00
1150 - 1550 nm 9 Filters (50 nm Increments) #88-298 €1.095,00 #88-305 €1.850,00 #88-312 €4.495,00
50nm Bandpass Filter Kit Curve 1150 - 1550nm Spectral Range
1150nm
1200nm
1250nm
1300nm
1350nm
1400nm
1450nm
1500nm
1550nm
100
90
80
70
60
50
40
30
20
10
0
Transmission (%)
1000 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600
Wavelength (nm)
750nm
800nm
850nm
900nm
950nm
1000nm
1050nm
1000nm
100
90
80
70
60
50
40
30
20
10
0
Transmission (%)
700 750 800 850 900 950 1000 1050 1100 1150
Wavelength (nm)
100
400nm
450nm
500nm
550nm
600nm
650nm
700nm
90
80
70
60
50
40
30
20
10
0
350 400 450 500 550 600 650 700 700
Transmission (%)
Wavelength (nm)
N
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/