"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 has won words of mouth in producing different flat windows in sapphire, Zns and other optical materials. Now SLTC has already introduced some core equipment and made some breakthroughs in producing high precise large flat windows, the largest size we could reach is 600 X 600, surface precise is up to RMS: 1/60λ, parallel error is less than 1″and the surface quality is higher than 20-10. In aerial photography, optical imaging etc. it serves as an observation windows, high powered laser windows, infrared optical windows widely being made use of.

• 　　平片指标表

  　　尺寸范围、极限偏差(mm) Dimensional range, limit deviation(mm)

   

  项目 Item	直径D Diameter D	厚度H Thickness H
  尺寸范围 Dimension Range	ф1~ф400	1~100
  公差 Tolerance	0/-0.01~0/-0.01	+/-0.01

   

  　　技术指标　Technical criteria

   

  项目 Item	普通 Average	精密 Precise	超精密 Ultra-Precise
  PV（632.8nm）	λ	λ/4	λ/10
  RMS(nm)	120	25	10
  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
  晶向偏差 Crystal Orientation Deviation	≤5°	≤2°	≤0.5°
  平行度 Depth of Parallelism	15'~10'	10'~1'	1'~10'
  晶向 Crystal Orientation	C
  切口球罩、带帽沿超半球、超半球球罩、半球球罩 Kerf dome　　hyper-hemispherical dome with the brim　　hyper-hemispherical dome　　hemispherical dome