"SLTC is professional in steadily supplying various large size crystal bars, windows and other products in Sapphire, which is available in ultraviolet, visible light and middle infrared fields at the same time. Therefore, it is treated as one of the most ideal optical windows and protective windows of optical lenses, widely applied in aerospace and medical equipment. 
SLTC is full confident in producing different types of domes including hemispheric and hyper-hemispheric domes, domes with a kerf and domes in a spherical crown shape, no matter it is in sapphire, Zns, MgF, glass or spinel etc. among which the largest radius the domes we could produce could reach 450mm. these products are usually applied as observation windows, protective windows etc.

• 项目 Item	曲率半径SR Radius of Curvature(SR)	口径D Caliber（D）	壁厚T Wall Thickness(T)	弓高H Dome Height(H)
  尺寸范围 Dimension Range	10~∞	ф20~ф300	≥1	≤R2

   

  项目 Item	普通 Average	精密 Precise	超精密 Ultra-Precise
  面型（632.8nm）N Spherical Irregularity(@632.8nm)	5λ	5/2λ	λ
  不规则度△N Irregularity of Newton's ring	1	1/2	1/4
  表面缺陷 Surface Quality	80/50	60/40	40/20
  表面粗糙度（nm) Surface roughness(nm)	1.5~2.5	0.5~1.5	＜0.5
  边缘厚度差 Edge Thickness Variation	0.05	0.02	0.01
  壁厚均匀性 Total Thickness Variation	0.10	0.05	0.02
  晶向偏差 Crystal Orientation Deviation	≤5°	≤2°	≤0.5°
  中心偏差 Centering Error	5‘~2’	2‘~1'	≤1’
  晶向 Crystal Orientation	C、A、M可选 C, A, M
  切口球罩、带帽沿超半球球罩、超半球球罩、半球球罩 Kerf dome　　hyper-hemispherical dome with the brim　　hyper-hemispherical dome　　hemispherical dome