Bi-concave lens element

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Double Concave lenses have spherical inward radius. Thinner at the center than at the edges. This shape causes light rays to diverge (spread out, expand) and the focal length is negative. Double concave (bi concave) lenses have spherical inward radius. These Alien Photonics lenses are thinner at the center than at the edges. This shape causes light rays to diverge (spread out) and the focal length is negative. Double concave lenses can be used to expand the laser beam. What is the purpose and key functions of Double Concave (Bi-Concave) Lenses? Image Reduction: In optical systems, these lenses can be used to reduce the size of an image before it is processed by another optical element. Correcting Optical Aberrations In combination with other lenses, double concave lenses can help correct spherical aberrations in optical systems. Double Concave (Bi Concave) advantages over Plano Concave Lens In laser-based applications, the choice between using a double concave or a plano-concave lens largely depends on the specific needs of the application, such as whether uniform beam divergence or precise beam control and shaping is required. Double concave lenses are better suited for applications that benefit from uniform beam expansion and divergence. Double Concave lenses for beam divergence Double concave lenses are particularly useful in applications where beam divergence is desired. They can spread a laser beam uniformly, which is beneficial in applications requiring a diffused laser output rather than a focused point.