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Home > Product Details > Flame and USB Series Custom Configured Gratings and Wavelength Range

Flame and USB 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

Allowable
Start
Wavelength

Typical
Spectral
Range*
(nm)

Blaze
Wavelength

Best
Efficiency (>30%)
(nm)

1

UV

600

150-400 nm

700-670

300 nm

200-575

2

UV-VIS

600

150-400 nm

700-670

400 nm

250-800

3

VIS-Color

600

300-500 nm

680-660

500 nm

350-850

4

NIR

600

400-700 nm

670-630

750 nm

530-1100

5

UV-VIS

1200

150-250 nm

325

Holographic UV

200-400

6

NIR

1200

425-880 nm

320-250

750 nm

500-1100

7

UV-VIS

2400

150-350 nm

170-140

Holographic UV

200-500

9

VIS-NIR

1200

330-600 nm

325-300

Holographic VIS

400-800

10

UV-VIS

1800

150-510 nm

235-175

Holographic UV

200-635

11

UV-VIS

1800

320-800 nm

210-110

Holographic VIS

320-720

12

UV-VIS

2400

150-640 nm

170-70

Holographic VIS

260-780**

14

NIR

600

450-725 nm

670-630

1000 nm

650-1100

31

UV-NIR

500

150-250 nm

925

250 nm

200-450

* Spectral range will be smaller when starting wavelength is longer. Spectral range also depends on exact spectrometer model. Please use our Range & Resolution Calculator tool for best approximation of spectral range.

** 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 Flame Product

View USB2000+ Custom Configured Product

View USB4000 Custom Configured Product