- 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||Equally spaced straight-groove replica grating *1|
|Blank Material||Soda glass|
|Effective Area||Total area less a 2-mm strip around the perimeter|
|Groove Density (at center of grating)||600±2 grooves/mm|
|Nominal Blaze Wavelength *2||340nm|
|Relative diffraction efficiency||50%min. (at 340nm and incident angle of 24 degree)|
|Coating (vacuum evaporation)||Aluminum|
|Scratches and Digs||80-50(in accordance with MIL-O-13830A)|
Example of Optical Mount (Polychromator)