Code | Material | AR Coating | D-mm | EFL-mm | BFL-mm | R1=R2-mm | Tc-mm | Te-mm |
---|---|---|---|---|---|---|---|---|
DCX163-01 | Calcium Fluoride (CaF2 Single Crystal) | 3-5 um | Ф12.7 | 15.0 | 12.9 | 12.1 | 5.6 | 2.0 |
DCX163-02 | Calcium Fluoride (CaF2 Single Crystal) | 3-5 um | Ф12.7 | 20.0 | 18.4 | 16.6 | 4.6 | 2.0 |
DCX163-03 | Calcium Fluoride (CaF2 Single Crystal) | 3-5 um | Ф12.7 | 40.0 | 38.9 | 34.2 | 3.2 | 2.0 |
IR Coated CaF₂ Double-Convex Lenses
These IR Coated Calcium Fluoride Double-Convex (DCX) Lenses are characterized by a positive focal length and consists of two convex surfaces of equal radius, and made from CaF2 Single Crystal, and coated with Infrared Coating @3-5um.
Silicon (Si), Zinc Selenide (ZnSe), or Germanium (Ge) substrates are well-suited for Infrared (IR) applications, while fused silica is appropriate for Ultraviolet (UV) applications.


Tc----- Center Thickness
Te----- Edge Thickness
R1----- Radius
Dia---- Diameter
BFL ---- Back Focal Length
EFL ---- Effective Focal Length
f'--------- Focus
H'-------- Principal Point
The Focal Length of each lens can be calculated using the simplified thick lens formula:
f=(R1×R2)/(n-1)×(R2-R1)
Where n is the refractive index and R is the radius of curvature of the lens surface.
1 | 2 |
---|---|
Center Thickness Tolerance | ±0.1mm |
Surface Irregular Accuracy | -- |
Centering Tolerance | <3 arcmin |
Bevelling | <0.2×45° |
1 | 2 |
---|---|
Design Wavelength | 587.6nm |
Focal Length Tolerance | ±1% |
Diameter Tolerance | +0.0/-0.1mm |
Surface Quality | 40/20-60/40 |
Double-Convex Lenses are commonly used in many finite imaging applications. This type of lens is best used when the object and image are on either side of the lens and the ratio of the distance to the object (conjugate ratio) is between 0.2 and 5.
IR Coated CaF2 Single Crystal(Calcium Fluoride) Double-Convex Lenses can also b can also be uncoated.
Anti-reflection coating can reduce the reflectivity of each surface of the lens.

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