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Optical and Laser Devices
Diffraction Gratings
Plane Blazed Holographic Gratings
Standard Plane Blazed Holographic Gratings
( Dicing type )
Features
- The grating grooves are formed by a holographic exposure method where the two-laser-beam-interference technology is applied. This holographic method lowers groove's periodical error commonly found in mechanically ruled gratings and ensures that the low stray light gratings can be produced.
- Blaze angle is formed by an ion-beam etching technology , which easily makes blazed holographic gratings with various angles (blaze wavelengths).
- High groove density and high resolution gratings can be manufactured easily and at competitive price.
RoHS* compliant products.
*RoHS：Directive 2002/95/EC on the Restriction of the Use of certain Hazardous Substances in Electrical and Electronic
Shape of Plane Gratings
Standard Specifications
| Grating Type | Equally spaced straight-groove replica trating *1 |
| Blank material | Soda glass |
| Dimensional tolerances*2 Width(W) and hegiht (H) of rectangular blanks Diameter(Φ) of round blanks Thickness(T) |
±0.2mm 0/0.2mm ±0.5mm |
| Effective area | Total area less a 2mm strip around the perimeter |
| Groove density tolerance | ±0.5 grooves/mm |
| Relative Diffraction efficiency at Blaze wavelength λ(Litt)*3 | 55% min. |
| Diffraction wavefront accuracy (λ=632.8nm, first-order light) | Within2λ |
| Coating (vacuum evaporation) | Aluminum (Aℓ) |
| Scratches and digs | 80-50 (in accordance with MIL-O-13830A) |
| *1 | : | The grating grooves are formed with resin. |
| *2 | : | The (T)3mm product has the edge chipping because it has cut it with the dicing equipment. |
| *3 | : | Nominal blaze wavelength λB(Litt) is the wavelength of the maximum diffraction efficiency with the design in littrow mounting. No one to guarantee the wavelength of the maximum diffraction efficiency. |
The external appearances and specifications are subject to change without notice.
Special Specifications
1 When you need special plane gratings other than our standard, please contact us or let us know by the following Request Form.
2 Holographic gratings (HG) can also be manufactured.
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