Product type: Concave Lens. Application: Medical, Optical. Model: yt395.
Overview
The Corning 7740/7980 Glass/Material Corning Optical Windows is supplied as an optical glass window made from Optical Glass. Listed geometry: diameter +0.0/-0.15 mm, single-lens shape. Optical / electrical data: transmittance 90%-95%. Coating: HC; surface quality 60/40,40/20 or Better. Typical applications: Medical and Optical. 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. | yt395 |
| Lenses Color | Clear |
| Color | Transparent |
| Polished | Yes |
| Diameter Tolerance | +0.0/-0.15 mm |
| Thickness Tolerance | +/-0.1mm |
| Centring Error | <3 Arc Minute |
| Bevel | 0.25mm×45 ° |
| Optical window materials comparison | Material |
| Supplier | Changchun Yutai Optics Co., Ltd. |
Technical data
| Material | optical glass |
|---|---|
| Design Wavelength | 632.8 nm |
| Surface Figure | 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
- Material and grade — listed as “Optical Glass”; name the glass or crystal grade (for example JGS1, N-BK7, Borofloat 33, sapphire) because it fixes the transmission band and thermal limits.
- Diameter or outline — listed as “+0.0/-0.15 mm”; give the nominal size and the tolerance you can accept.
- Thickness — listed as “+/-0.1mm”; state nominal thickness and tolerance; thinner windows need tighter flatness control.
- Surface quality and flatness — listed as “60/40,40/20 or Better”; quote scratch-dig and flatness over the clear aperture, not the whole part.
- Coating — listed as “HC”; list the wavelength band and the maximum reflectance per surface for any AR coating.
- Clear aperture and edges — listed as “90%”; define the usable aperture and the edge chamfer.
Engineering guides for this part
For material grades and coating options, see Borofloat 33 Glass: Material Selection for Precision Substrates. How parts like this are machined and finished is covered in Borosilicate Glass Sandblasting for Consistent Matte Surface Processing. For an application example, read Custom Optical Window Glass for Smart Thermostats | OEM/ODM. Before sending a drawing, check Specifying Coatings for Custom Glass Windows and Substrates. A related standard product is Infrared Windows.
