Applications Information - Verity Instruments, Inc. - #1

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In North America, call 1-972-446-9990 5 Applications Information Window Materials 100 200 300 400 500 600 700 800 900 10 20 30 40 50 60 70 80 90 100 % TRANSMISSION UV Sapphire UV Quartz Pyrex & Glass Pyrex only Wavelength (nm) In applications where plasma is viewed through a window, the proper selection of window material is essential to viewing the desired spectra. Use the chart at the left to select the proper window material, viewports, lenses, etc. As a rule, costs increase as ultraviolet (UV) transmittance improves. Resistance to etching is an additional consideration in window material selection. Of the options presented here, UV sapphire offers the greatest resistance to etching. Of course, window material selection is not an issue when using a viewing technique that employs a vacuum feedthrough. Grating Options The EP Series monochromators are available with a UV or standard grating. The diagram on the left shows the relative efficiency of these gratings. Note that the blaze wavelength occurs on the low side of the grating 30% efficiency range. Grating Type Standard UV Typical Range VIS/NIR UV/VIS Blaze Wavelength 450nm 350nm 30% Efficiency Range 310–920 220–750