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Home > Product Details > Jaz Series Custom Configured Gratings and Wavelength Range

Jaz Series Custom Configured Gratings and Wavelength Range

Gratings for Ocean Optics spectrometers 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 Number

Intended Use

Groove Density

Spectral Range

Blaze Wavelength

Best Efficiency (>30%)

1

UV

600

650 nm

300 nm

200-575 nm

2

UV-VIS

600

650 nm

400 nm

250-800 nm

3

VIS-Color

600

650 nm

500 nm

350-850 nm

4

NIR

600

625 nm

750 nm

530-1100 nm

5

UV-VIS

1200

300 nm

Holographic UV

200-400 nm

6

NIR

1200

200-270 nm

750 nm

500-1100 nm

7

UV-VIS

2400

100-140 nm

Holographic UV

200-500 nm

9

VIS-NIR

1200

200-270 nm

Holographic VIS

400-800 nm

10

UV-VIS

1800

100-190 nm

Holographic UV

200-635 nm

11

UV-VIS

1800

120-160 nm

Holographic VIS

320-720 nm

12

UV-VIS

2400

50-120 nm

Holographic VIS

260-780 nm*

14

NIR

600

625 nm

1000 nm

650-1100 nm

31

UV-NIR

500

200-1025 nm

250 nm

200-450 nm

*For applications >720 nm, please consult an Application Sales Engineer.

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. For example, Grating 1 has about a 650 nm spectral range, but is most efficient from 200-575 nm. In this case, wavelengths >575 nm will have lower intensity due to the grating’s reduced efficiency.

Additional Information:

View Jaz Series Products