凹面グレーティング
| Type | Groove density (nb/mm) | Width (mm) | Height (mm) | Thickness (mm) | Optimized wavelength or band (nm) | Polarization state/diffraction order | Optimized angle (°) | RoC (mm) |
|---|---|---|---|---|---|---|---|---|
| Diameter (mm) | ||||||||
| C = concave | ex: (TM+TE)/2 (-1) | Constant deviation angle | Ex: -750 | |||||
| Constant incidence angle | ||||||||
- (TM+TE)/2 (-1) is desired polarisation state and diffraction order the grating should be optimised for. TE or TM can also be specified
- W is the blank dimension in mm parallell with the grating grooves
- H is the blank dimension in mm perpendicular to the grating grooves
- Alternatively a diameter can be specified
Standard values
Standard tolerances on W, H, Dia: ± 0.2 mm Thk ± 0.5 mm. CA > 90 % of blank diameter. The groove frequency (at the grating centre) is accurate within ±0.2 grooves/mm of the nominal value.
On the shelf:
| Size [mm] | Thk [mm] | RoC [mm] | Material |
|---|---|---|---|
| 40 x 45 | 7 | -225 | Pyrex |
| 50 x 50 | 7 | -225 | Pyrex |
| Ø50.8 | 6 | -100 | BK7 |
| Ø63.5 | 12.5 | -400 | Pyrex |
| Ø63.5 | 12.5 | -750 | Fused Silica |
| Ø63.5 | 12.5 | -999 | Quartz |