FIG. 01.01
Lenses · Type 04 / 11
Double-Concave Lenses
Two concave faces: a negative lens for diverging light and expanding beams.
- Part
- Double-Concave Lens
- Family
- Lenses
- Fig.
- 01.04
- Coating
- In-house
- Quality
- ISO 9001
- Made in
- Roorkee
Description
A double-concave (biconcave) lens curves inward on both sides, so it is thinnest at the centre. It diverges light and forms virtual, reduced images. It is used to expand beams, to lengthen the focal length of an optical system, and in imaging and vision-correction optics.
Specify yours.
Start from a catalogue part or from your own drawing, in the material, coating and tolerance grade you need.
AMaterial
- Optical glass (BK7-class crown, flint)
- Fused silica / fused quartz
- Sapphire
- CaF₂
- BaF₂
- MgF₂
- Silicon (Si)
- Germanium (Ge)
- Zinc sulphide (ZnS)
- Zinc selenide (ZnSe)
- Nd:YAG crystal
- Other UV and IR materials
BCoatingIn-house
- ARAnti-reflection
- Al · AgMetallic mirror
- HRDielectric mirror
- Filter
- Beam-splitter
- Polarizing
CTolerance grade
| Parameter | Commercial | Precision |
|---|---|---|
| Thickness | ±0.1 mm | ±0.01 mm |
| Radius | 1% | 0.5% |
| Refractive index | 0.001 | 0.0001 |
| Abbe (V-number) | 1% | 0.1% |
| Centration | 3 arc-min | 30 arc-sec |
| Tilt / wedge | 1 arc-min | 10 arc-sec |
| Surface irregularity | 1 fringe | λ/4 (0.25 fringe) |
| Surface quality (scratch-dig) | 60-40 | 10-5 |
DMade to your drawing
Send your drawing.
A drawing or a short spec is enough. We quote to it.
- Dimensions and tolerances
- Material and coating
- Surface quality
- Quantity
More lenses.
FIG. 01.02
Double-Convex Lenses
FIG. 01.03
Plano-Concave Lenses
FIG. 01.05
Positive Meniscus Lenses
FIG. 01.06
Negative Meniscus Lenses
FIG. 01.07
Plano-Convex Cylindrical Lenses
FIG. 01.08
Plano-Concave Cylindrical Lenses
FIG. 01.09
Positive Achromatic Lenses
FIG. 01.10
Negative Achromatic Lenses
FIG. 01.11
Cylindrical Achromatic Lenses
Quote for double-concave lenses.
Tell us the size, material, coating and quantity, or send a drawing. We reply with a quote.