Double Concave Lens
Double Concave Lenses are precision negative lenses with two concave optical surfaces, designed to diverge incoming light and provide accurate beam expansion and optical path adjustment. With high transmission, low optical distortion and precise curvature control, Chenyu Optics manufactures double concave lenses in BK7, fused silica and UV fused silica, uncoated or with UV AR, VIS AR and NIR AR coatings.
Double Concave Lens Overview
Double Concave Lenses are precision negative lenses with two concave optical surfaces, designed to diverge incoming light and provide accurate beam expansion and optical path adjustment.
With high transmission, low optical distortion and precise curvature control, double concave lenses are widely used in laser systems, beam divergence control, imaging systems and scientific optical instruments.
Chenyu Optics supports custom double concave lens manufacturing according to customer drawings, including custom diameter, focal length, surface accuracy and coating design for prototype and repeat production.
Key Advantages of Double Concave Lens
Laser Beam Expansion & Divergence Control
Double concave lenses are widely used for beam divergence control in laser beam expansion systems, alignment setups and imaging optical systems.
Typical Specifications of Double Concave Lens
| Material Options | BK7, Fused Silica, UV Fused Silica |
|---|---|
| Optical Function | Beam divergence / Negative focusing |
| Focal Length | Customized |
| Transmission | High optical transmission |
| Surface Accuracy | λ/4 – λ/10 @ 633 nm |
| Surface Quality | 20-10 / 40-20 scratch-dig |
| Wavefront Distortion | Low |
| Coating Options | Uncoated, UV AR, VIS AR, NIR AR, custom coating |
Lens Geometry & Optical Principle
Why Choose Chenyu Optics for Double Concave Lens
Chenyu Optics focuses on drawing-based precision lens manufacturing for laser, imaging and scientific optical systems. We support prototype verification, small-batch production and repeat manufacturing for non-standard double concave lenses.
Manufacturing Capability for Double Concave Lens
Precision Grinding & Polishing
Precise curvature control and high-quality polishing for accurate negative focal length and consistent beam divergence.
Optical Coating
UV AR, VIS AR and NIR AR coating options for laser, imaging and scientific instrument applications.
Inspection & Packaging
Dimensional inspection, surface review, optical performance checking and protective packaging before shipment.
Custom Manufacturing Options for Double Concave Lens
Dimensions & Focal Length
Custom diameter and focal length can be manufactured according to customer drawings, with standard or custom double concave geometry.
Surface & Optical Quality
Surface accuracy, surface quality and wavefront distortion can be selected according to optical performance and system requirements.
Coating & Wavelength Design
Uncoated, UV AR, VIS AR, NIR AR and custom AR coatings can be specified for laser systems, imaging or broadband applications.
Lens Shape Comparison
| Double Concave | Plano Concave | Plano-Convex | Biconvex | |
|---|---|---|---|---|
| Focal Length | Negative | Negative | Positive | Positive |
| Surface Configuration | Two concave surfaces (symmetrical) | One flat, one concave surface | One flat, one convex surface | Two convex surfaces (symmetrical) |
| Typical Function | Strong, symmetrical beam divergence | Beam divergence, single-surface aberration control | Beam focusing and collimation | Strong, symmetrical beam focusing |
| Typical Applications | Laser beam expansion, divergence control, alignment | Laser beam expansion, collimation systems | Focusing systems, laser collimation | Imaging, beam focusing systems |
Applications of Double Concave Lens
Laser Beam Expansion Systems
Beam expansion and divergence control for laser optical systems.
Beam Divergence Control
Precise negative focal length for beam divergence adjustment.
Laser Alignment Systems
Symmetrical negative lens design for laser alignment applications.
Optical Imaging Systems
Optical path correction for imaging and relay optics.
Collimation Systems
Beam collimation and optical path adjustment.
Scientific Instruments
Precision lenses for research and laboratory optical setups.
Double Concave Lens FAQ
What is the function of a double concave lens?
A double concave lens diverges incoming light and is used for beam expansion, divergence control, and optical path adjustment.
Why does a double concave lens have a negative focal length?
The two concave surfaces cause parallel light rays to diverge, creating a virtual focal point and negative focal length.
What is the difference between a plano concave lens and a double concave lens?
A plano concave lens has one flat surface and one concave surface, while a double concave lens has two concave surfaces and provides a symmetrical optical design.
Can double concave lenses be customized?
Yes. Custom focal lengths, materials, dimensions, and AR coatings are available.
What information should I provide for a quotation?
Please provide diameter, focal length, surface accuracy, surface quality, coating requirement, quantity and drawing if available.
Where can I learn more about lens design?
Additional information on lens design can be found from Edmund Optics.
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Need Custom Double Concave Lenses?
Send us your drawing, focal length, diameter, coating requirements and quantity. Chenyu Optics will review the optical and mechanical specifications and provide a suitable double concave lens manufacturing suggestion.