- The toroidal diffraction gratings are made by aspheric blanks where each curvature of orthogonal two axes (meridional and sagittal) is different.
- The toroidal diffraction gratings are formed on toroidal (aspheric) blanks that can correct astigmatisms.
- The toroidal diffraction gratings, which are produced by holographic exposure method and ion-beam etching technology, have low stray light and high efficiency.
|Grating Type||Unequally spaced curved-groove replica grating*1|
|Blank Material||Soda glass|
|Central Thickness||7±0.5(T) (mm)|
|Effective Area||Total area less a 2mm strip around the perimeter|
|Wavelength range||340 to 900nm|
(at center of grating)
|Nominal Blaze Wavelength*2||340nm||400nm|
|Relative diffraction efficiency||50% min. ( at nominal wavelength )|
|Coating (vacuum evaporation)||Aluminum|
|Scratches and Digs||80-50 ( in accordance with MIL-O-13830A )|