01 Sep 2009 FOCtek offers custom-made windows maded of materials such as BK7, Fused Silica, Sapphire, CaF2, Silicon, Borofloat, Pyrex or other optical glass supplied by Schott and Chinese CDGM. Specifications of BK7 Window:
Typical Diameter (Φmm): 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 38.1, 50.8
Typical Thickness (mm): 2.0, 3.0, 6.0, 6.35
Diameter Tolerance (mm): +0.0/-0.2 (General), +0.0/-0.02 (High Precision)
Thickness Tolerance (mm): ±0.2 (General), ±0.005 (High Precision)
Clear Aperture: >80% (Small Size), >95% (Large Size)
Parallelism: 3 min. (General), 3 sec. (High Precision)
Surface Quality: 60/40 (General), 10/5 (High Precision)
Flatness (per 25mm@633nm): λ /2(General), λ/10 (High Precision)
Bevel (face width x 45。):<0.25mm
Coating: Uncoated, AR, HR, PR, Coating, etc. |
