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January 09, 2024

What is a plano-concave lens?

A plano-concave lens is a negative lens with a negative focal length. The parallel light beam will diverge after being incident on the plano-concave lens. The outgoing rays cannot converge to one point, but instead seem to diverge from a virtual image point located in the object space. When the absolute conjugate ratio is greater than 5:1 or less than 5:1, plano-concave lenses reduce spherical aberration and coma. , the best shape of the negative lens for distortion. The concave surface of a plano-concave lens should face the object direction, but when used in high-energy laser systems, it should be placed opposite to reduce the possibility of gathering residual reflected light from the surface. A plano-concave lens has one side spherical and one side flat. The middle is also thinner than the sides.

Plano-concave lens features:

Plano-concave lenses have one concave side and a flat side, and have a negative focal length. Typically used to collimate a beam, increase (reduce) the focal length, or enlarge (reduce) the image. In order to obtain smaller spherical aberration, when the incident beam is a collimated beam, the collimated beam should be incident on the concave surface of the plano-concave lens.

Plano-concave lenses with negative focal length are often used in imaging or beam collimation applications. Coated lenses are also widely used in visible light and near-infrared applications.

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