Product type: Concave Lens. Application: Medical, Optical. Model: yt445.
Overview
The 0.3mm/0.4mm/0.5mm Sapphire Window Thin Glass Wafers for Semiconductor or Electron is supplied as a sapphire / specialty wafer made from Optical Glass. Listed geometry: diameter +/-0.01 mm, single-lens shape. Optical / electrical data: transmittance 90%-95%. Coating: HC; surface quality 60/40,40/20 or Better. Listed for Medical and Optical applications. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Optical Glass |
|---|---|
| Type | Concave Lens |
| Shape | Single-lens |
| Transmittance | 90%-95% |
| Coating | HC |
| Surface Quality | 60/40,40/20 or Better |
| Clear Aperture | 90% |
| Usage | Medical, Optical |
| Model NO. | yt445 |
| Lenses Color | Clear |
| Color | Transparent |
| Polished | Yes |
| Diameter Tolerance | +/-0.01 mm |
| Thickness Tolerance | +/-0.01mm |
| Centring Error | <3 Arc Minute |
| Bevel | 0.25mm×45 ° |
| Optical window materials comparison | Material |
| Supplier | Changchun Yutai Optics Co., Ltd. |
Technical data
| Material | Sapphire |
|---|---|
| Thickness | 0.1/0.2/0.3/0.4/0.5/ |
| Flatness | λ/2 |
| Diameter Tolerance | +0.1, -0.1 mm |
| Thickness Tolerance | ±0.2 mm |
| Paraxial Focal Length | ±2% |
| Centration | <3 arc minutes |
| Clear Aperture | >85% |
| Surface Quality | 60-40 scratch and dig |
| Protective Bevel | 0.25 mm x 45° |
What to specify when you request a quote
- Diameter and flat / notch — listed as “+/-0.01 mm”; state diameter, flat or notch and their tolerances.
- Thickness and TTV — listed as “+/-0.01mm”; give thickness, its tolerance and total thickness variation.
- Polish and roughness — listed as “60/40,40/20 or Better”; specify single- or double-side polish and roughness.
- Flatness, bow and warp — quote flatness, bow and warp limits.
- Material grade — listed as “Optical Glass”; name the grade (JGS1/JGS2, Borofloat 33, alkali-free, sapphire orientation).
Engineering guides for this part
For material grades and coating options, see Fused Quartz Wafer Substrate Selection: Materials & Coatings for Semiconductor and Optical Systems. How parts like this are machined and finished is covered in Glass Wafer Bonding for Microfluidic and MEMS Applications: Process Overview. For an application example, read Custom Ultra-Thin Glass Discs for Appliance Sensor Assemblies. Before sending a drawing, check Specifying Coatings for Custom Glass Windows and Substrates. A related standard product is Custom Ultra-Thin Quartz Glass Disc.
