The flat concave decoy mirror is a negative lens with a negative focal length, and the parallel beam will diverge after incident on the flat concave decoy mirror. The outgoing light cannot converge into a point, but seems to diverge from a virtual image point in the object space. When the absolute conjugate ratio is greater than 5 ∶ 1 or less than 5 ∶ 1, the flat Concave Lens is the best negative lens to reduce spherical aberration, coma and distortion. The concave surface of a flat concave lens should face the object But when applied to high energy laser systems Then I should be placed opposite To reduce the possibility of residual reflected light gathering on small surfaces. The flat concave mirror is spherical on one side and planar on the other. The middle is thinner than both sides.
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 Plano-Concave 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 Plano-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：
Silicon Window Pentagonal Prism Meniscus Lens Bandpass Fliter Silicon window Dove Prism
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