Standard Plane Blazed Holographic Gratings
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.
Shape of Plane Gratings
Standard Specifications
| Grating Type | Equally spaced straight-groove replica grating *1 |
|---|---|
| Blank material | Soda glass |
| Dimensional tolerances*2 Width(W) and hegiht (H) of rectangular blanks Thickness(T) |
±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 been cut 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.
- ※RoHS compliant (Directive 2011/65/EU + (EU)2015/863 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment)
- The external appearances and specifications are subject to change without notice.
- Be sure to prevent condensation as this can cause a significant deterioration of optical characteristics.
Special Specifications
1 When you need special plane gratings other than our standard, please contact us.
2 Holographic gratings (HG) can also be manufactured.
3 Round gratings can also be manufactured.
Characteristics ( measurement values for reference only )
AFM Image of Blazed Holographic Grating
Groove density : 900 grooves/mm
Blaze wavelength : 1200 nm
Blaze angle : 33°
Profile of Blazed Holographic Grating Obtained with a Stylus Profiler System
Groove density: 900 grooves/mm
Blaze wavelength: 270 nm
Blaze angle: 7°
Examples of Optical Systems
Application to a Littrow Type Spectrometer
Application to a Czerny-Turner Type Spectrometer
Application to a Variable-wavelength Monochrome Laser (Littman Configuration)
Application to a Double-path Monochromator
