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  Infrared Optics & Coatings for Andover Corporation
ㆍ작성자: 전재필 ㆍ작성일: 2020-02-27 (목) 09:39 ㆍ조회: 27



 


Standard & Custom

Optical Filters and Coatings

 

INFRARED OPTICS

Coatings & Capabilities

 


 


 

Imaging Infrared Neutral Density Filters

 

Our Infrared Neutral Density (IRND) filters are now available with a back-surface anti-reflection coating as an additional option. The standard IRND filters consist of an attenuating film on one side of a Germanium substrate leaving the other surfaces uncoated both the attenuating surface and the uncoated Germanium surface are partially reflective.

 

This can create what is known as an etalon effect due to interference between the beams reflected from each surface. The etalon effect can produce fringe artifacts in images and intensity variations with wavelength. The anti-reflection coating lowers the reflection of the uncoated surface thereby greatly reducing the intensity of one of the interfering beams, and effectively disabling the etalon effect.

 

For more information, click here.

 


 

Infrared Neutral Density Filters

 

Andover Corporation’s metallic-coated neutral density filters obtain their optical density from a metal alloy coating on a substrate determined by the wavelength region of interest.

 

Unlike the all-dielectric or absorption type our metallic ND filters employ a combination of absorption and reflection to reduce the intensity of infrared light.

 

 

For more information, click here.


 


 


Custom Infrared Coatings

Andover Corporation offers custom infrared optical coatings on a variety of substrates in various shapes and sizes to function as AR coatings, bandpass, long and short pass, dichroics, and more.

 

While generally operating at 0 to 45, the coatings can be optimized for any particular angle or range of angles of incidence. Some of our specialized custom infrared optical coatings include Dual- Band Filters, Dichroic Beamsplitters, and Ultra- Narrowband Filter.

 

For more information click here.


Standard Infrared

Bandpass Filters

Andover offers a competitive line of standard infrared bandpass filters. Meant to isolate specific regions of the spectrum, these filters simultaneously provide high transmission and

deep rejection.

 

We offer our standard infrared bandpass filters in narrow or wide bandwidths, and they can be custom-fabricated to suit your specific requirements.

 

For more information, click here.