概述
- Material: K9 glass
- Machinable diameter: Ø1-Ø500mm
- Focal length range: 4.5-1000mm
- Wavelength range: 350nm-2.0μm (uncoated), 350-650nm (VIS broadband anti-reflection film), 650-1050nm (NIR broadband anti-reflection film), 1050-1700nm (SWIR broadband anti-reflection film)
The K9 Double Concave Lenses have a negative focal length that diverges a parallel beam into the virtual focus, making them an excellent choice for diverging convergent beams and for relay imaging systems.
K9 bi-concave lenses are based on RoHS-compliant K9 glass, which has excellent broad spectral transmission characteristics (high transmittance at 350nm-2000nm wavelengths) and high hardness, so it can withstand a variety of physical or chemical stimuli, so it is often used as a substrate for a variety of optical components.
Dimension-Labs offers a wide range of uncoated K9 bi-concave lenses (specific sizes and parameters can be filtered from the details below) and three types of anti-reflection coatings (VIS, NIR, SWIR) to meet the diverse applications you need.
General parameters
| Material | K9 | Effective aperture | >90% |
| Face | λ/4@632.8nm | Finish | 40-20 |
| Design wavelength(nm) |
632.8 |
Focal length tolerance | ±1% |
| Form Tolerance(mm) |
+0.0/-0.1 |
Thickness tolerance(mm) |
±0.1 |
| Eccentricity | ＜3ˊ |
Inverted side | ＜0.2×45° |
K9 double concave lens, uncoated（350-2000nm）
● Optical component material: K9 ● Working wavelength: 350nm-2μm (uncoated) ● Multiple diameters and focal lengths are available ● Usage: imaging, beam expansion, beam reduction
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K9 double concave lens，VIS（350-650nm）
● Optical component material: K9 ● Working wavelength: 350-650nm ● Multiple diameters and focal lengths are available ● Usage: imaging, beam expansion, beam reduction
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K9 double concave lens，NIR（650-1050nm）
● Optical component material: K9 ● Working wavelength: 650-1050nm ● Multiple diameters and focal lengths are available ● Usage: imaging, beam expansion, beam reduction
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K9 double concave lens，SWIR（1050-1700nm）
● Optical component material: K9 ● Working wavelength: 1050-1700nm ● Multiple diameters and focal lengths are available ● Usage: imaging, beam expansion, beam reduction
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