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 wavelength reference has also been developed for the Mid-infrared. 

Absorbance  References

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

 NIR Solution Reference

This Reference Material can be used to qualify the Absorbance scale, 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) 

NIR Transflectance Reference

These references can be used to qualify the absorbance accuracy and linearity of near-infrared spectrophotometers over the wavelength range 800 nm - 3200 nm.

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Wavelength References

NIR Wavelength Reference Solution Reference (900 – 2600 nm)


This Reference Material can be used to qualify the wavelength calibration, in the Near Infrared region of the spectrum of spectrophotometers in transmission mode with spectral bandwidths of 5 nm or less.


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NIR Transflectance Reference
(900 – 2600 nm)

NIR Transflectance Reference

This Reference Material is specially designed for the 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)


This popular reference material is now available as a NIST-traceable CRM covering wavelengths from 1.1µm to 18.5 µm (9000 cm-1 to 540 cm-1). A total of 20 peaks is available for wavelength qualification purposes. It is also accepted by some pharmacopoeias as a wavelength and resolution reference


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Starna wide-range wavelength reference (335 nm to 1945 nm)

This exceptionally wide-range filter contains a mixture of rare earth oxides and provides 20 peaks for wavelength calibration between 335 nm in the UV and 1945 nm in the NIR. It is equivalent to NIST SRM 2065. Nominal peak wavelength values (in nm) are: 335, 345, 361, 375, 386, 402, 418, 485, 538, 583, 642, 748, 804, 976, 1076, 1151, 1222, 1366, 1469, 1945

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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)

didymium glass

The Didymium (neodymium & praseodymium) Glass  filter  produces characteristic peaks in the  visible region of the spectrum, with 11 well-defined peaks  from  430 nm to 890 nm. Approximate peak wavelength values (in nm) are: 431, 473, 513, 529, 573, 585, 685, 741, 749, 807, 879.



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Didymium Oxide Solution
(290 – 870 nm)

 Didymium Oxide solution

The spectrum of didymium in perchloric acid contains 14 peaks that can be certified for wavelength, covering the range from 290 nm to 870 nm. This reference is useful for its NIR coverage, but has few peaks in the UV and is not accepted by the Pharmacopoeias for wavelength qualification in this region.


Approximate peak wavelength values (in nm) are: 298, 329, 354, 444, 469, 482, 512, 522, 576, 732, 740, 794, 799, 864 


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