Aberration-corrected Toroidal Gratings for Flat-field Polychromators
- 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.
RoHS* compliant products.
*RoHS : Directive 2002/95/EC on the Restriction of the Use of certain Hazardous Substances in Electrical and Electronic Equipment.
*1: The grating grooves are formed with resin.
||Unequally spaced curved-groove replica grating *1
||Total area less a 2mm strip around the perimeter
||340 to 900nm
(at center of grating)
|Nominal Blaze Wavelength *2
|Relative diffraction efficiency
||50% min. ( at nominal wavelength )
|Coating (vacuum evaporation)
|Scratches and Digs
||80-50 ( in accordance with MIL-O-13830A )
*2: Nominal blaze wavelength is the wavelength of the maximum diffraction efficiency (target) with the design mounting. No one to guarantee the wavelength of the maximum diffraction efficiency.
* In the interests of product improvement, the external appearance and specifications are subject to change without notice.
Example of Optical Mount (Polychromator)
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