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 GratingsStandard 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 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
