90
70
50
30
20
100
90
80
70
60
50
40
30
20
10
Typical Transmission
IR Longpass Filters Transmission Curves
Colored Glass Replacement Longpass Filters
Diameter Tolerance (mm): ±0,127
Thickness (mm): 1,10 ±0,10
Clear Aperture (%): 90
Surface Quality: 80-50
Pass Band Transmission (%): >90 (typical)
Rejection Band Blocking: OD ≥5,0
Environmental Durability: MIL-STD-810, Method 507,3,
Procedure III, Modified to 40 cycles
Physical Durability: MIL-C-48497
Operating Temperature Range (°C): -100 to +400
Infrared (IR) Longpass Filters
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• Dielectric Coated Longpass Filters
• >90% Typical Transmission and >OD5 Blocking
• 100% Environmentally Safe, RoHS Compliant
Construction
Colored Glass Replacement Longpass Filters feature
dielectric coatings that provide wide reflection and
transmission bands with steep transition slopes. Unlike
colored glass filters that block undesired wavelengths
via absorption, these filters provide blocking
via reflection, making their performance independent
of thickness. These filters are constructed from 100%
environmentally safe, RoHS compliant materials, and
their manufacturing process enables custom options
not available in colored glass including customerspecified
cut-on wavelengths and larger dimensions.
Colored Glass Replacement Longpass Filters are ideal
for environmental monitoring, immuno-diagnostic
testing, DNA analysis, and applications requiring
RoHS compliant materials. A wide operating temperature
range of -100 to +400°C also enables use in
harsh environment conditions.
• Coated on Silicon or Germanium Substrates
• Ideal for Isolating Broad Spectral Regions
• Durable, First-Surface Coatings
Longpass filters provide a sharp cut-off below a particular
wavelength. Often used for order sorting, they
isolate broad regions of the spectrum, simultaneously
providing high transmission of desired energy, and
deep rejection of unwanted energy. Constructed of
hard, durable first-surface dielectric coatings on optical
quality IR-transmitting substrates, these filters
will withstand normal cleaning and handling associated
with any high-quality optical component. These
filters are particularly useful for FTIR spectroscopy
and thermal imaging applications. Please contact us
for custom size or coating requirements.
0
2 4 6 8 10 12 14
Transmission (%)
Wavelength (μm)
7.3μm Cut-On
4.5μm Cut-On
3.6μm Cut-On
2.4μm Cut-On
1.65μm Cut-On
Diameter Tolerance (mm): +0,0/-0,1
Thickness (mm): 1,0 ±0,2
Clear Aperture (%): 90
Surface Flatness: 3 - 5l at Cut-On l
Surface Quality: 60-40
Parallelism (arcmin): <10
Transmission: >85% Average
Blocking: >3,0 Average
Cut-On Wavelength: 5% of Peak Transmission
Slope Factor: <7% (12% for 1,05 μm)
Infrared (IR) Longpass Filters
Cut-On
Cut-On
Transmission
Wavelength
Tolerance
Band Substrate
12,5 mm Diameter 25 mm Diameter 50 mm Diameter
Stock No. Price Stock No. Price Stock No. Price
1,05 μm 0,04 μm 1,10 - 2,10 μm Silicon #33-967 €122,50 #68-651 €255,00 #68-657 €370,00
1,65 μm 0,07 μm 1,73 - 3,30 μm Silicon #33-968 €135,00 #68-652 €275,00 #68-658 €400,00
2,40 μm 0,09 μm 2,52 - 4,80 μm Germanium #33-969 €145,00 #68-653 €289,00 #68-659 €430,00
3,60 μm 0,14 μm 3,78 - 7,20 μm Germanium #33-970 €155,00 #68-654 €299,00 #68-660 €475,00
4,50 μm 0,18 μm 4,73 - 9,00 μm Germanium #33-971 €165,00 #68-655 €325,00 #68-661 €510,00
6,00 μm 0,24 μm 6,30 - 12 μm Germanium #36-150 €195,00 #36-151 €385,00 #36-152 €540,00
7,30 μm 0,29 μm 7,67 - 14,60 μm Germanium #33-972 €195,00 #68-656 €385,00 #68-662 €540,00
T (%)
80
60
40
10
0
200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
λ (nm)
320nm
420nm
550nm
590nm
630nm
665nm
715nm
780nm
850nm
1000nm
Colored Glass Replacement Longpass Filters
Cut-On
Wavelength
(nm)
Cut-On
Wavelength
Tolerance (nm)
Rejection
Band (nm)
Transmission
Band (nm)
12,7 mm Diameter 25,4 mm Diameter
Stock No. Price Stock No. Price
320 ±5 200 - 300 335 - 2500 #15-444 €39,00 #15-454 €49,00
420 ±5 200 - 390 440 - 2500 #15-445 €39,00 #15-455 €49,00
550 ±5 200 - 515 570 - 2500 #15-446 €39,00 #15-456 €49,00
590 ±5 200 - 555 610 - 2500 #15-447 €39,00 #15-457 €49,00
630 ±6 200 - 595 650 - 2500 #15-448 €39,00 #15-458 €49,00
665 ±6 200 - 630 685 - 2500 #15-449 €39,00 #15-459 €49,00
715 ±7 200 - 665 735 - 2500 #15-450 €39,00 #15-460 €49,00
780 ±7 200 - 710 800 - 2500 #15-451 €39,00 #15-461 €49,00
850 ±8 200 - 775 870 - 2500 #15-452 €39,00 #15-462 €49,00
1000 ±9 200 - 860 1035 - 2500 #15-453 €39,00 #15-463 €49,00
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