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INOUIRY
Biconcave lenses have a negative focal length, making them suitable for diverging and converging beams.
Biconcave lenses can diverge collimated beams to a virtual focal point and are commonly used in Galilean beam expanders.
| Substrate Material | H-K9L, Quartz, Calcium fluoride, Zinc selenide | Diameter | 5-800mm (customized) |
|---|---|---|---|
| Diameter Tolerance | +0.0/-0.1 mm | Thickness Tolerance | ±0.1 mm |
| Focal Length Tolerance | ±1% | Clear Aperture | >90% |
| Surface Quality | 60/40-20/10 | Surface Accuracy | λ/4- λ//8 |
| Lens Centering Error | <3' | Coated | Uncoated, VIS, NIR, SWIR |
H-K9L Biconcave Lenses
Available sizes: Ø6mm, Ø9mm, Ø10mm, Ø1/2 inch (Ø12.7mm), Ø1 inch (Ø25.4mm), Ø20mm, Ø30mm, Ø40mm, and Ø2 inch;
Available uncoated or with three antireflective coatings: Uncoated: 350nm – 2.0 µm; A-coating: 350-700 nm; B-coating: 650-1100 nm; C-coating: 1050-1700 nm
Quartz Fused Biconcave Lenses
Available sizes: Ø4mm, Ø5mm, Ø6mm, Ø6.3mm, Ø10mm, Ø15mm, Ø0.5 inch (Ø12.7mm), Ø16mm, Ø1 inch (Ø25.4mm), and Ø2 inch (Ø50mm);
Available uncoated or with four antireflective coatings: Uncoated: 185nm – 2.1 µm; UV coating: 250-450 nm; VIS coating: 350-700 nm; NIR coating: 650-1100 nm; SWIR coating: 1000 – 1650 nm.
Calcium Fluoride Caf2 Biconcave Lenses
Available sizes: Ø12.7mm, Ø25.4mm;
Available versions with or without antireflective coating: Uncoated: 0.12-10µm; IR1 coating: 3-5μm;
Zinc Selenide ZnSe Bi-concave Lenses
Available sizes: Ø12.7mm, Ø25.4mm;
Available versions with or without antireflective coating: Uncoated: 0.12-10µm; IR2 coating: 8-12μm;
If you need to order in stock or custom biconcave lenses, please kindly contact our sales team:
info@borisuns.com/ jessie@borisuns.com
