Diffraction Gratings

Aberration-corrected Toroidal Gratings for Flat-field Polychromators

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.


Code Number P0550-01TR P0550-02TR
Grating Type Unequally spaced curved-groove replica grating *1
Blank Material Soda glass
Dimensions 30±0.2(W)×30±0.2(H) (mm)
Central Thickness 7±0.5(T) (mm)
Effective Area Total area less a 2mm strip around the perimeter
Wavelength range 340 to 900nm
Groove Density
(at center of grating)
550±2 grooves/mm
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 )

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*1: The grating grooves are formed with resin.
*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.

Outline Drawing

Outline DrawingOutline Drawing

Example of Optical Mount (Polychromator)

Example of Optical Mount (Polychromator)Example of Optical Mount (Polychromator)

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