Double-concave lenses have two concave surfaces, ideal for diverging light beams in beam expanders, laser systems, and optical measuring devices.
LUMINA can offer various optical glass, fused silica, and infrared material options, with precision customization for dimensions and coatings.
Material: H-K9L, N-BK7, fused silica, CaF₂, ZnSe, etc.
Diameter：0.5mm—300mm
Diameter tolerance：±0.1mm to±0.02mm
Focal length range：-5mm to -800mm(Typical)
Focal length tolerance：±1% to±0.5%
Centration：< 3 arc min to <10 arc sec
Clear aperture：>85% to >95%
Surface quality：MIL 60-40 to MIL 10-5
Surface accuracy:up toλ/10, Ra < 5 nm
Coating options: AR coatings or custom coatings upon request
Specifications may vary depending on lens geometry, diameter, focal length, and material.
Beam divergence for expansion systems
Wide material range including infrared options
Precision sizing and coating customization
Lasers
Inspection
Scientific research
