As we have seen above, IR optical components relates to many different kind of components and materials. Most of the precision optics suppliers do provide optical components for infrared application whereas some supplier specialized in IR material manufacturing (Ge, Si, ZnSe, CaF2, MgF2 etc..)

Ir OpticsBinoculars

Infrared refers to electromagnetic radiations with wavelength spectrum between 750nm and 1mm. The name cames from the infrared spectrum covers radiations of smaller frequencies than the smallest visible wavelengths view as red by the human eye.

One other interesting characteristic of chalcogenide glass is it’s low temperature dependency of it’s refractive index (dn/dT), which means that the material optical properties will be more stable with change of temperature.

IRlens material

RPO's assembly capabilities include rapid prototyping, custom-built and high-volume assembly of aspheres, doublets, triplets, lens sub-assemblies and image modules. Test capabilities include characterization of radiometric properties, MTF, longitudinal and lateral aberrations and lens centration. RPO supports both passive and active alignments. Mechanical assemblies are supported by RPO's in-house machine shop for fabrication of precision lens spacers and barrels.

Infrared lens for iPhone

SWIR stands for Short-Wavelength Infrared, it’s spectrum covers 1µm to 3µm. The SWIR wavelength are used for long distance communications.

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Infrared camera lens

If you have heard of LIDAR, night vision, thermal camera or spectroscopy, you may understand that infrared applications surround us and are poised to a steady development in the near future. As most of the Photonics applications, infrared applications need optical elements.

The Most Trusted Name in Night Vision Optics™, RPO understands the unique optical assembly design and fabrication challenges for soldier-capable precision optical assemblies. The Optics Industry's proven supplier for advanced optical assemblies in military applications, RPO has developed the expertise, from concept to design for manufacturability to assembly techniques, to ensure precision and reliability of field-use optics. While RPO continues to excel as a world-leader in custom optical assemblies, RPO now offers The World's Lightest Standard Eyepiece & Objective assemblies, meeting AN/PVS-14 Optical Criteria Specifications, as standard catalog products. RPO also offers standard Thermal Imaging optical assemblies.RPO's standard products can serve as a customizable starting point for precision eyepieces for a variety of applications and resolutions. These eyepiece assemblies can be ordered from our selection of predetermined specifications or modified to fit customer requirements.Download the RPO product catalog to view our ready design specifications and diagrams.

The short answer is optical components that are used in infrared wavelength. They are particular because infrared wavelength are by definition not visible with human eyes. Therefore specific equipment are required to asses them.

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NIR stands for Near Infrared, by near it refers to it’s closeness to visible spectrum. The NIR spectrum covers 750nm to 1µm.  These wavelengths are used in the night vision technology and telecommunications.

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IRRifleOptics

Thermal IR are wavelength used for thermal imaging application, their range may varies according to the applications but commonly covers MWIR & LWIR.

Moreover, as infrared range is quite wide, IR optics can be divided in different groups according to their applications.

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Infrared lens glasses

There are different grades of chalcogenide glass available on the market with optical index ranging from 2.49 to 3.13 (lower than Germanium ones) and densities from 4.4 g/cm3 to 5.3 g/cm3. Dimensions of molded chalcogenide glass lenses can range from 5mm to 25mm diameter.

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Infrared lens photography

IROptical Sensor

RPO's Class 100/1,000/10,000 clean room assembly facilities and dedicated program cells, along with a commitment to being #1 in product quality and on-time delivery, ensure RPO remains the most trusted partner for high-volume optical assemblies, eyepieces and objectives.

Infrared optics are reputed for not being cheap, which limit their application especially for high quantities and complexe shapes (aspherical). Fortunately, chalcogenide glass is a good alternative to more commun materials like germaniun for far infrared applications. Chalcogenide glass, mainly made of S, Se, As, Ge and Te have low softening temperature which enable this material to be molded. While chalcogenide glass itself may be more expensive than Germanium, by molding it, it  can be used to get high quantities, affordable aspherical optics.

As the range of IR radiation is quite large, further division of the spectrum is done, each corresponding to certain characteristics. Below shows the detail of each IR subdivision.

RPO's comprehensive metrology labs include state of the art interferometers, surface profilometers, refractometers and spectrophotometers to ensure that products are optimized in the manufacturing process, as well as to ensure that every part meets customer specifications.

RPO's vertical integration allows for optical assemblies using advanced precision molded aspheres. Aspheres increase performance and dramatically reduce weight and size.  RPO's  glass and plastic molding technologies, along with specialized optical assembly expertise, provide the world's most trusted night vision (I2) eyepieces and objectives.

RPO has over 40,000 sq. ft. of climate controlled Class Standard 10,000 cleanroom space dedicated to advanced optical assembly and designed to deliver the highest quality products requiring the most stringent particulate specifications.

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RPO has the in-house capabilities to provide complete custom optical element and assembly solutions for Defense and Commercial markets, from conceptual design support through full rate production—standard or custom.

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