K9(BK7) k9
K9(BK7) has excellent mechanical properties, very low bubble and impurity levels, and good scratch resistance; the source also includes the phrase "k9(b270) product image". Its chemical stability allows grinding and polishing without special treatment. Applications include optoelectronics, microwave technology and diffractive optical elements.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Transmission Range | 0.4–2.5 µm |
| Density | 2.51 g/cc |
| Thermal Expansion [@-30° to +70°C] | 7.1×10⁻⁶ |
| Thermal Expansion [@20° to 300°, Temperature Unit Not Repeated in This Latter Segment] | 8.3×10⁻⁶ |
| Surface Polishing | bk-7 polishes extremely well & polishes of 10-5, or 20-10 scratch-dig are achieved at extra costs respectively, mainly for uv & visible applications. |
| Surface Profile Diagram | surface figure of 1/10 wave to 1/4 wave @ 0.6328µm are specified mostly on lenses for ultraviolet & visible use. |
| Coating | ar @ 0.8-2.5µm, ar @ 1.064, ar @ visible wavelength. |
| Manufactured Products | Lenses, Prisms, Optical Filters, Filters, etc. |
| Refractive Index [Wavelength=0.4047 (Wavelength Unit Not Provided in Source Table)] | 1.530 |
| Refractive Index [Wavelength=0.4800 (Wavelength Unit Not Provided in Source Table)] | 1.523 |
| Refractive Index [Wavelength=0.5461 (Wavelength Unit Not Provided in Source Table)] | 1.519 |
| Refractive Index [Wavelength=0.6328 (Wavelength Unit Not Provided in Source Table)] | 1.515 |
| Refractive Index [Wavelength=0.8521 (Wavelength Unit Not Provided in Source Table)] | 1.510 |
| Refractive Index [Wavelength=1.0600 (Wavelength Unit Not Provided in Source Table)] | 1.507 |
| Refractive Index [Wavelength=1.5300 (Wavelength Unit Not Provided in Source Table)] | 1.501 |
| Refractive Index [Wavelength=1.9700 (Wavelength Unit Not Provided in Source Table)] | 1.495 |
| Refractive Index [Wavelength=2.3250 (Wavelength Unit Not Provided in Source Table)] | 1.489 |
| Nd [Source Material Comparison Item: China-K9] | 1.516371 |
| Vd [Source Material Comparison Item: China-K9] | 64.13356 |
| Nd [Source Material Comparison Item: Schott-BK7] | 1.516800 |
| Vd [Source Material Comparison Item: Schott-BK7] | 64.169998 |
| Nd [Source Material Comparison Item: HOYA-BSC7] | 1.516800 |
| Vd [Source Material Comparison Item: HOYA-BSC7] | 64.2 |
Applications
Datasheet
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Supplier Information
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