S p e ctro m ete rs Ocean Optics pioneered the concept of ... - NDN
S p e ctro m ete rs Ocean Optics pioneered the concept of ... - NDN
S p e ctro m ete rs Ocean Optics pioneered the concept of ... - NDN
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USB User-Configured Spe<strong>ctro</strong>m<strong>ete</strong><strong>rs</strong><br />
Gratings for USB2000+/USB4000 Spe<strong>ctro</strong>m<strong>ete</strong><strong>rs</strong><br />
The graphs below are grating efficiency curves for gratings with groove densities <strong>of</strong> 500, 600, 1200, 1800 and 2400 mm -1 . Additional information is<br />
available at www.oceanoptics.com/Products/bench_grating_usb.asp.<br />
Spe<strong>ctro</strong>m<strong>ete</strong><strong>rs</strong><br />
Groove Density <strong>of</strong> 600 mm -1 Groove Density <strong>of</strong> 1200 mm -1<br />
Relative Efficiency<br />
Relative Efficiency<br />
Grating #1 Grating #2 Grating #3 Grating #4 Grating #14<br />
Grating #5 Grating #6 Grating #9<br />
Groove Density <strong>of</strong> 1800 mm -1<br />
Groove Density <strong>of</strong> 2400 mm -1<br />
Relative Efficiency<br />
Relative Efficiency<br />
Grating #10 Grating #11<br />
Grating #7 Grating #12<br />
Grating Selection Tips:<br />
Groove Density <strong>of</strong> 500 mm -1<br />
- These efficiency curves relate only to <strong>the</strong> grating. System response<br />
is affected by a number <strong>of</strong> variables, including d<strong>ete</strong>ctor response.<br />
- Grating selection <strong>of</strong>ten involves trade-<strong>of</strong>fs. For example, gratings<br />
with very high groove density (lines/mm -1 ) allow greater optical<br />
resolution but at <strong>the</strong> expense <strong>of</strong> a truncated spectral range. If<br />
<strong>the</strong> user is characterizing two or three closely aligned laser wavelengths,<br />
such a trade-<strong>of</strong>f <strong>of</strong> resolution for range might be acceptable.<br />
For o<strong>the</strong>r applications, a wider range with good resolution<br />
would make better sense.<br />
Relative Efficiency<br />
- The XR grating (#31) is a good option for broad spectral coverage<br />
(200-1050 nm) without sacrificing optical resolution (~2.0 nm<br />
FHWM with a 25 µm slit). For efficiency <strong>of</strong> Grating #8 (3600 mm -1 ),<br />
visit our website.<br />
Grating #31 (XR)<br />
www.oceanoptics.com Tel: +1 727-733-2447 21
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