Infrared Long Pass Filters by Andover Corporation

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Infrared Long Wave Pass Filters - Standard

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: 25 mm and 50 mm dia. However, we can produce custom sizes and shapes, as well as custom optical characteristics. Contact our technical sales department for a quotation.

Size, Shape & Part Number
5% point cut-on W/L	Slope	25mm ø	50mm ø
1.05µm ± 0.04µm	12%	1.05ILP-25	1.05ILP-50
1.65µm ± 0.07µm	7%	1.65ILP-25	1.65ILP-50
2.40µm ± 0.09µm	6%	2.40ILP-25	2.40ILP-50
3.60µm ± 0.14µm	6%	3.60ILP-25	3.60ILP-50
4.50µm ± 0.18µm	6%	4.50ILP-25	4.50ILP-50
7.30µm ± 0.29µm	6%	7.30ILP-25	7.30ILP-50

General Specifications
Diameter Tolerance:	+0/-.1mm
Thickness:	1.0mm ±0.2
Minimum Clear Aperture:	90% of O.D.
Substrate Material:	Silicon, Germainum or Sapphire
Flatness:	2 waves at 632.8nm
Parallelism:	<10 arc minutes
Surface Quality:	80/50 per MIL-C-48497A
Coating Quality:	80/50 per MIL-C-48497A
24-hour Humidity:	per MIL-C-48497A
Moderate Abrasion:	per MIL-C-48497A
Adhesion:	per MIL-C-48497A
Operating Temperature:	-62°C to +71°C
Transmission (Ave):	>90%
Rejection (Ave):	<0.1%
Mechanical:	Not mounted in metal holders


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