Diffraction GratingsAberration-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.

Specifications

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 )
  • *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.
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  • * In the interests of product improvement, the external appearance and specifications are subject to change without notice.

 

Outline Drawing

Outline Drawing

 

Example of Optical Mount (Polychromator)

Example of Optical Mount (Polychromator)