The Near-infrared region is normally considered to cover the wavelength range from 750 nm to 2500 nm, and Starna have developed reference materials for absorbance and wavelength qualification in this region. A new, NIST traceable polystyrene reference has also been developed for the Mid-infrared that is also suitable for qualifying Attenuated Total Reflectance (ATR) measurements

Absorbance  References

Metal-on-Quartz Neutral Density Filters (250 - 3200 nm) 

absorbance qualification in the ultra-violet, visible and near-infrared regions of the spectrum (250 nm to 3200 nm) 

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NIR Neutral Density Filters (800 nm to 3200 nm) 

absorbance accuracy and linearity over the wavelength range 800 nm - 3200 nm.
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Wavelength References

NIR Wavelength Reference Solution Reference (900 – 2600 nm)

wavelength qualification in the Near Infrared 
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NIR Transflectance Reference (900 – 2600 nm)    

wavelength qualification of near infrared reflectance spectrophotometers.
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Near-and Mid-infrared Polystyrene References 
(1.1µm to 18.5µm, 9000 cm-1 to 540 cm-1)

NIST traceable wavelength references, also accepted by some pharmacopoeias as a wavelength and resolution reference. Versions available for ATR measurements.
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Starna wide-range wavelength reference (335 nm to 1945 nm)

20 peaks for wavelength calibration from UV to NIR
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Some references used in the visible region have useful peaks in the NIR and are included here for information:

Didymium Glass Filter (430 nm to 890 nm)

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Didymium Oxide Solution (290 – 870 nm)  

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