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Home > Product Details > NIRQuest Custom Configured Gratings and Wavelength Range

NIRQuest Custom Configured Gratings and Wavelength Range

Gratings from Ocean Optics are permanently fixed in place at the time of manufacture to ensure long-term performance and stability. Choose from among multiple gratings for your custom configured spectrometer. When selecting your grating, consider groove density (resolution), spectral range (wavelength range) and blaze wavelength (determines the most efficient range). We offer ruled and holographic diffraction gratings. Holographic gratings produce less stray light while ruled gratings are more reflective, resulting in higher sensitivity.

Tip: Use our interactive Range & Resolution Calculator to determine your spectrometer’s anticipated optical resolution over a specific wavelength range.

Grating Intended Use

Groove Density (lines/mm)

Spectral Range*
(nm)

Blaze Wavelength
(nm)

Best Efficiency (>30%)

NIR1 NIRQuest512-2.5

75

1600

1700

1075-2500 nm

NIR2 NIRQuest512-2.2
NIRQuest256-2.1

100

1200

1600

900-2050 nm

NIR3 NIRQuest256-2.1 NIRQuest512
NIRQuest512-1.9 NIRQuest512-2.2

150

~800

1100

900-1700 nm

NIR10 NIRQuest256-2.1 NIRQuest512
NIRQuest512-1.9 NIRQuest512-2.2

300

350-380

1200

750-2200 nm

NIR11 NIRQuest256-2.1 NIRQuest512
NIRQuest512-1.9 NIRQuest512-2.2

400

240-290

1600

980-2500 nm

NIR12 NIRQuest256-2.1 NIRQuest512
NIRQuest512-1.9 NIRQuest512-2.2

500

160-220

1370

900-2500 nm

NIR13 NIRQuest256-2.1 NIRQuest512
NIRQuest512-1.9 NIRQuest512-2.2

600

100-180

1200

800-2500 nm

NIR14 NIRQuest512, NIRQuest512-1.9

1000

50-90

1310

900-1700 nm

 

*For optimum performance, we recommend setting the starting wavelengths no lower than 900 nm unless absolutely necessary.

Note: Additional grating options, adjustments to starting and ending wavelengths and similar customization may be available. Please contact an Applications Scientist for details.

Groove Density:

The Groove Density (mm-1) of a grating determines its dispersion, while the angle of the groove determines the most efficient region of the spectrum. The greater the groove density, the better the optical resolution possible, but the more truncated the spectral range.

Spectral Range:

The dispersion of the grating across the linear array; also expressed as the “size” of the spectra on the array. The spectral range (bandwidth) is a function of the groove density and does not change. When you choose a starting wavelength for a spectrometer, you add its spectral range to the starting wavelength to determine the wavelength range. For several gratings, the Spectral Range of a grating varies according to the starting wavelength range. The rule of thumb is: the higher the starting wavelength, the more truncated the spectral range.

Blaze Wavelength:

For ruled gratings, the Blaze Wavelength is the peak wavelength in an efficiency curve. For holographic gratings, it is the most efficient wavelength region.

Best Efficiency (>30%):

All ruled or holographically etched gratings optimize first-order spectra at certain wavelength regions; the “best” or “most efficient” region is the range where efficiency is >30%. In some cases, gratings have a greater spectral range than is efficiently diffracted.

Additional Information:

View NIRQuest Custom Configured Product