BK7 optical biconvex Spherical Mirror is a biconvex spherical mirror processed with BK7 glass as raw material. Because of its high stability and good performance, it is widely used in different high-precision optical elements and optical lenses for industrial scientific research, such as national defense, military industry, precision medical instruments, etc. It is composed of two spheres, which is characterized in that the focal length in the middle of the lens surface is long and the focal length at the end of each lens surface is short. Cylindrical Lens is mainly used to condense light from point light source or transmit images to other optical systems.
Material: K9, BK7, FS, UVFS, CaF₂, ZnSe
Diameter:3mm-200mm±0.05mm
Center Thickness Tolerance:±0.05mm
Lens Alignment Error:≤3min
Surface Accuracy:λ/ 10 @
Surface Quality:40/20. 60/40. 80/60
Effective Caliber: 90%
Example with BK7 material：These N-BK7 biconvex lenses are available uncoated or with one of five antireflection coatings (-A, -AB, -B, -C, or -D), which reduces the amount of light reflected from each surface of the lens (see the Selection Guide table below for coating option). Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of an AR coating improves transmission, which is important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections. Having optics that are AR coated on both surfaces is particularly desirable for applications utilizing multiple optical elements. Please see the Graphs tab for additional coating information.
| N-BK7 Double- Convex Lens Selection Guide | 
|
| Coating name | wavelength band |
| Uncoated | Uncoated |
| A Coating | 350nm-700nm |
| AB Coating | 400nm-1100nm |
| B Coating | 650nm-1050nm |
| C Coating | 1050-1700nm |
| D Coating | 1650nm-3000nm |
Other series products：
Meniscus Lens Cylindrical lens Rod lens Sapphire Window Dome Calcium Fluoride Window
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