Flat concave lens: One side is concave and the other side is planar, with a negative focal length. Typically used for beam collimation, increasing (decreasing) focal length, or expanding (reducing) an image. To obtain a more spherical aberration, when the incident beam is a collimated beam, the collimated beam should be incident onto the concave surface of the flat concave lens. K9 is a common flat concave lens material, mostly used in visible and near-infrared applications. In addition to K9 flat and concave lenses, our company also provides UV fused quartz and calcium fluoride flat and concave lenses. UV fused quartz has good transmittance and low coefficient of thermal expansion in the UV band, while calcium fluoride has a high damage threshold and chemical inertness.
Our flat and concave lenses are finely processed, with strict quality control, ensuring that we provide high-quality flat and concave lens products to users at reasonable prices.