English
Double concave lens is concave on both sides, thin in the middle and thick in the edge, used to increase the divergence of converging rays. The focal length is negative, causing parallel incident rays to diverge outward. The curvatures of the two sides are equal to each other and are used for beam extension and projection. It is used in optical components, laser systems, thermal imaging in infrared optics and sensitive components in high-energy detectors.
ATOPTIK’s double concave lens is a symmetrical optical element with concave surfaces on both sides, primarily used for beam divergence, optical beam expansion, laser collimation, and optical imaging. With excellent beam divergence capability and aberration control, double concave lenses are widely applied in laser beam adjustment, optical communication, optical instruments, and sensors.
| Specifications | Normal | High Precision | Mfg. Limit |
| Material : | Optical glass | Optical glass | Optical glass |
| Diameter Tolerance : | +0/-0.1mm | +0/-0.05mm | +0/-0.01mm |
| Thickness Tolerance : | +/-0.1mm | +/-0.05mm | +/-0.01mm |
| Focal Length Tolerance : | +/-2% | +/-1% | +/-0.5% |
| Centeration : | 3 arc min | 1 arc min | 10 arc sec |
| Surface Quality : | 60-40 | 40-20 | 10-5 |
| Surface Figure : | 3 Iambda | 2 lambda | 1 lambda |
| Surface Irregularity : | 1/4 lambda | 1/10 lambda | 1/20 Iambda |
| Clear Aperture : | >80% | >90% | 100% |
| Bevel : | +/-0.2*45 degree | +/-0.1*45 degree | +/-0.05*45degree |
Symmetrical Double-Concave Structure
Both sides are concave, with a negative focal length, effectively diverging beams or expanding the spot size.
Ideal for optical systems that need to reduce beam convergence or increase beam diameter, such as laser beam expanders or optical projection devices.
High Optical Precision
Precision manufacturing ensures low aberration and high optical performance, providing excellent beam control.
Surface quality typically reaches 40/20 or higher, minimizing optical scattering and enhancing optical path stability.
Various Material Options
Available in multiple optical materials, including BK7 optical glass, fused silica, and sapphire, covering a wide spectral range from ultraviolet (UV) to near-infrared (NIR).
Fused silica is suitable for UV-NIR optical systems, while sapphire exhibits outstanding impact resistance and high-temperature durability.
Anti-Reflection (AR) Coating Options
Custom coatings can be applied to the lens surface as per application needs. Common AR coatings cover wavelength ranges like 400-700 nm, 1064 nm, and 1310/1550 nm, reducing surface reflections and enhancing light transmission efficiency.
AR coatings help improve the overall transmission rate of optical systems and reduce ghosting caused by multiple reflections.
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