Ruled Diffraction Gratings 25x25x6mm 1200Lines/mm Float Glass | GU OPTICS
Ruled Diffraction Gratings 25x25x6mm 1200Lines/mm  Float Glass

Ruled Diffraction Gratings 25x25x6mm 1200Lines/mm Float Glass

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Product No. 378561

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Size 25x25x6mm
Groove Density 1200Lines/mm
Blaze Wavelength 500nm
Blaze Angle 17°27'
Chromatic Dispersion 0.8nm/mrad
Substrate Material Float Glass
Surface Quality 60-40
Dimension Tolerance ±0.5mm
Thickness Tolerance ±0.5mm
Efficiency 60%~ 80% @Blaze Wavelength
Clear Aperture 90%
Damage Threshold 350mJ/cm² @200ns Pulsed Laser;40W/cm² (CW) Continuous Laser
Genre UV~NIR Gratings
The initial step to make an original or master grating is to select the substrate material, usually usin glass or copper. The substrate material is polished to a high flatness and coated with very thin aluminum. The parallelism and equidistance of the grooves takes time to adjust. A few days is required to set up and test before engraving. The engraver must make sure the diamond knife head can return back in a precise way after each engraving and can engrave the substrate based on the quantity on schedule. The parallelism and displacement of the grooves must be precisely controlled. Engraving requires a series of tests. After testing passed, the original grating can be carved on a large substrate. The original grating is very expensive, so the grating can only be used limited until the replica grating is developed.
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