• Useful for isolating broad spectral regions
  • Constructed of hard, durable first-surface coatings
  • Available in standard and custom wavelengths

Standard IR Long Pass Filters

Long wave pass 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. 

For your convenience and economy, we offer the filters in two standard sizes: 25mm and 50mm dia. However, we can produce custom sizes and shapes, as well as custom optical characteristics. Contact our technical sales department for a quotation.

We also offer long pass filter in the UV and visible wavelength ranges, including steep-edge long pass filters.
Can't find what you're looking for? Feel free to contact us. Also, check our surplus listings for more options.

 

General Specifications:

Thickness: 1.0±0.2mm
Diameter Tolerance:+0/-0.1mm
Min. Clear Aperture: 90% of outside dimension
Substrate Material: Silicon or Germanium
Flatness: 3-5 waves at cut-on W/L
24-hour humidity:per MIL-C-48497A
Operating Temperature:-62°C to +71°C
Parallelism:<10 arc minutes
Transmission (Ave):>85% from 1.05 x cut-on to 2.0 x cut-on
Rejection (Ave):<0.1%
Slope:<7% (12% for 1.05µm filter)
DESCRIPTION PART NO. 1-5 pcs. >5 pcs. QTY IN STOCK QTY
+ IR Long Pass Filter, 1050.0nm 5% point, 12.5 mm dia. 1.05ILP-12.5 $90 $86 0
5% Wavelength 1050.0+40/-40 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $90
6+ $86
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 1050.0nm 5% point, 25.0 mm dia. 1.05ILP-25 $197 $187 17
5% Wavelength 1050.0+40/-40 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $197
6+ $187
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 1050.0nm 5% point, 50.0 mm dia. 1.05ILP-50 $317 $301 6
5% Wavelength 1050.0+40/-40 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $317
6+ $301
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 1650.0nm 5% point, 12.5 mm dia. 1.65ILP-12.5 $94 $89 6
5% Wavelength 1650.0+70/-70 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $94
6+ $89
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 1650.0nm 5% point, 25.0 mm dia. 1.65ILP-25 $215 $204 36
5% Wavelength 1650.0+70/-70 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $215
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 1650.0nm 5% point, 50.0 mm dia. 1.65ILP-50 $335 $318 19
5% Wavelength 1650.0+70/-70 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $335
6+ $318
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 2400.0nm 5% point, 12.5 mm dia. 2.40ILP-12.5 $104 $99 6
5% Wavelength 2400.0+90/-90 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $104
6+ $99
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 2400.0nm 5% point, 25.0 mm dia. 2.40ILP-25 $242 $230 17
5% Wavelength 2400.0+90/-90 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $242
6+ $230
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 2400.0nm 5% point, 50.0 mm dia. 2.40ILP-50 $373 $354 14
5% Wavelength 2400.0+90/-90 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $373
6+ $354
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 3600.0nm 5% point, 12.5 mm dia. 3.60ILP-12.5 $112 $106 12
5% Wavelength 3600.0+140/-140 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $112
6+ $106
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 3600.0nm 5% point, 25.0 mm dia. 3.60ILP-25 $255 $242 6
5% Wavelength 3600.0+140/-140 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $255
6+ $242
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 3600.0nm 5% point, 50.0 mm dia. 3.60ILP-50 $406 $386 9
5% Wavelength 3600.0+140/-140 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $406
6+ $386
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 4500.0nm 5% point, 12.5 mm dia. 4.50ILP-12.5 $121 $115 0
5% Wavelength 4500.0+180/-180 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $121
6+ $115
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 4500.0nm 5% point, 25.0 mm dia. 4.50ILP-25 $285 $271 28
5% Wavelength 4500.0+180/-180 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $285
6+ $271
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 4500.0nm 5% point, 50.0 mm dia. 4.50ILP-50 $442 $420 12
5% Wavelength 4500.0+180/-180 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $442
6+ $420
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 6000.0nm 5% point, 12.5 mm dia. 6.00ILP-12.5 $122 $116 43
5% Wavelength 6000.0+240/-240 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $122
6+ $116
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 6000.0nm 5% point, 25.0 mm dia. 6.00ILP-25 $305 $290 13
5% Wavelength 6000.0+240/-240 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $305
6+ $290
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 6000.0nm 5% point, 50.0 mm dia. 6.00ILP-50 $448 $426 6
5% Wavelength 6000.0+240/-240 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $448
6+ $426
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 7300.0nm 5% point, 12.5 mm dia. 7.30ILP-12.5 $124 $118 31
5% Wavelength 7300.0+290/-290 nm
Type LWP
Size 12.5 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $124
6+ $118
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 7300.0nm 5% point, 25.0 mm dia. 7.30ILP-25 $335 $318 34
5% Wavelength 7300.0+290/-290 nm
Type LWP
Size 25.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $335
6+ $318
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ IR Long Pass Filter, 7300.0nm 5% point, 50.0 mm dia. 7.30ILP-50 $455 $432 10
5% Wavelength 7300.0+290/-290 nm
Type LWP
Size 50.0 +0/-0.1mm
Thickness 1.0 +0.2/-0.2 mm
QtyPrice
1-5 $455
6+ $432
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.