Double Concave (Biconcave) Lenses
A lens with two concave surfaces, the symmetric negative-power counterpart to a double convex lens.
Share requirements, quantities and a drawing if available. Specifications and supply terms require confirmation.
Overview
A double concave (biconcave, or DCV) lens has concave curvature on both surfaces, giving it negative optical power distributed symmetrically rather than on one plano-concave side. Like its double-convex counterpart, this shape is chosen for specific conjugate-ratio and aberration-control reasons in an optical design, not as an arbitrary variant of a plano-concave lens. Procurement review should center on spreading a beam with two concave surfaces where symmetric negative power supports the layout.
Key Selection Points
- Symmetric negative-power design useful in specific beam-divergence and relay-lens configurations
- Complements double-convex lenses in balanced optical systems
Applications
Double concave lenses are used in beam-divergence and relay-lens designs alongside double-convex or other positive elements, where a symmetric negative-power element suits the optical layout better than a plano-concave lens.
Lens Geometry & Selection Guide
This module explains how lens geometry changes the selection path and the information required from the optical design. For Double Concave (Biconcave) Lenses, the module focuses on spreading a beam with two concave surfaces where symmetric negative power supports the layout.
- Show surface orientation, optical axis and conjugate or beam condition in the drawing.
- Include focal length, prescription and aberration targets with the enquiry for feasibility review.
- State tolerance and manufacturable-range requirements on the drawing for review.
- Product-specific review: connect surface radii relationship with input beam state and document the trade-off against a plano-concave lens.
Prepare a product-specific enquiry
Include the requirements you know and identify any points that need confirmation.
| RFQ input | What to provide |
|---|---|
| Input 1 | Use case for Double Concave (Biconcave) Lenses: document spreading a beam with two concave surfaces where symmetric negative power supports the layout. |
| Input 2 | First decision pair: surface radii relationship versus negative focal requirement. |
| Input 3 | Integration pair: input beam state together with material, coating and mount. |
| Input 4 | RFQ-specific instruction: state input convergence/divergence and the required output beam behavior. |
| Input 5 | Add the requested quantity and prototype or production stage. |
| Input 6 | Attach controlled drawings and identify the inspection or spectral evidence the buyer expects. |
Frequently Asked Questions
When should I use a double concave lens instead of a plano-concave lens?
When your optical design calls for symmetric negative power distributed across both surfaces rather than concentrated on one side — this is a design choice your optical engineer or drawing will specify.
Can you supply a custom diameter or coating for Double Concave (Biconcave) Lenses?
Double Concave (Biconcave) Lenses requires this decision to be tied to surface radii relationship and negative focal requirement. Share your drawing or exact specification through the RFQ form and we will confirm feasibility.
Which specification should be fixed first for Double Concave (Biconcave) Lenses?
Begin with surface radii relationship. It determines how negative focal requirement and input beam state should be evaluated before the mechanical details are finalized.
When is Double Concave (Biconcave) Lenses a better fit than a plano-concave lens?
Choose between them by testing the requirement for spreading a beam with two concave surfaces where symmetric negative power supports the layout. If that requirement is absent, the comparison product may provide a simpler procurement path.
What should an RFQ for Double Concave (Biconcave) Lenses include?
State input convergence/divergence and the required output beam behavior. Also include quantity, drawing revision and the required acceptance evidence. Final availability is confirmed during quotation.
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