- Material: N-BK7
High precision surface:
- DURAN 50: dilatation 3.2x10⁻⁶/°C
- ZERODUR: dilatation 0 ± 0.15x10⁻⁶/°C
- Dimensional Tolerance:
- 0 to 50mm: +0 -0.1mm
- 60 to 120mm: +0 -0.2mm
- 150 to 250mm: +0 -0.3mm
- Thickness: ± 0.2mm
* In this chart, thickness is given by the 7th and 8th of the reference (in mm)
On request: other dimensions to 1000 mm
- Protected aluminium: R average > 90% visible and U.V.
- Protected silver: R moyen > 97% visible and I.R.
- Protected gold: R average > 98.5% I.R.
- R max>99.5%, one specific wavelength.
- R max>98% some bandwidth