Grating Efficiency Curves Predicted Ranges & Resolution
Below are the Grating Efficiency Curves for gratingswith groove densities of 600, 1200, 1800 and 2400 mm Here are a series of graphs to demonstrate the range and opticalresolution (FWHM) of your USB4000 Spectrometer with a 25 µm slit.See our website for additional graphs of ranges and resolutions for
every slit size.
-1
. See curves for all of our gratings atOceanOptics.com/Technical/GratingCharts.asp.
-1 Grating and 25-µm Slit
1200 mm
8070
60
50
40
3020 680670
660
650
640
630
620
610
600
590580 1.361.34
1.32
1.30
1.28
1.26
1.24
1.221.20 Example : If the startingwavelength is
#1#2
#3
#4
#14 250 nm , thenthe range is ~667 nm ,providing a
250-917 nm
wavelength
range and
RESOLUTION (nm) RELATIVE EFFICIENCY SPECTRALRANGE (nm) 1.34 nm
200 400 600 800 1000 1200 200 300 400 500 600 700 800 900 1000 resolution.
WAVELENGTH (nm) STARTINGWAVELENGTH (nm) Efficiency Curves for Gratings 1, 2, 3, 4 and 14.
-1 Grating and 25-µm Slit
1800 mm
8070
60
50
40
3020 350330
310
290
270
250
230
210
190
170150 Example :
0.650.60
0.55
0.50
0.450.400.350.30 If the startingwavelength is 350 nm , thenthe range is
#5#6
#9 ~310 nm ,providing a
350-660 nm
wavelength
range and
RESOLUTION (nm) RELATIVE EFFICIENCY SPECTRALRANGE (nm) 0.63 nm
200 400 600 800 1000 1200 200 300 400 500 600 700 800 900 1000 resolution.
WAVELENGTH (nm) STARTINGWAVELENGTH (nm) Efficiency Curves for Gratings 5, 6 and 9.
Spectrometers Gratings with Groove Density of 1800
Gratings with Groove Density of 2400
Gratings with Groove Density of 1200
Gratings with Groove Density of 600600 mm
-1 Grating and 25-µm Slit
2400 mm
8070
60
50
40
3020 240220
200
180
160
140
120100 Example :
0.450.40
0.35
0.30
0.250.20 If the startingwavelength is 400 nm , thenthe range is
#10#11 ~190 nm ,providing a
400-590 nm
wavelength
range and
RESOLUTION (nm) RELATIVE EFFICIENCY SPECTRALRANGE (nm) 0.38 nm
200 400 600 800 1000 1200 200 300 400 500 600 700 800 resolution.
WAVELENGTH (nm) STARTINGWAVELENGTH (nm) Efficiency Curves for Gratings 10 and 11.
-1 Grating and 25-µm Slit
8070
60
50
40
3020 160150
140
130
1201101009080 0.320.30
0.28
0.26
0.24
0.22
0.200.18
0.16 Example : If the startingwavelength is 300 nm , thenthe range is
#7
#12 ~140 nm ,providing a
300-440 nm
wavelength
range and
RESOLUTION (nm) RELATIVE EFFICIENCY SPECTRALRANGE (nm) 0.29 nm
200 400 600 800 1000 1200 200 300 400 500 600 resolution.
WAVELENGTH (nm) STARTINGWAVELENGTH (nm) Efficiency Curves for Gratings 7 and 12.
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