Plano Concave Spherical Lens

What is a plano concave lens?
Plano-Concave lenses bend parallel input rays to diverge from one another on the output side of the lens and hence have a negative focal length. Because the spherical aberration of the Plano-Concave lenses is negative, they can be used to balance aberrations created by other lenses.

How does concave lens work?

The plano-concave lenses are used to expand light beams or to increase focal lengths in optical systems. The Biconcave Lenses are often used to expand light beams or to increase focal lengths in optical systems, and are normally used in combination with other lenses.

Description of the plano concave spherical lens

1. Plano concave lens have negative focal lengths
2. Diverge collimated incident light
3. Forms only virtual images which are seen through the lens
4. Reduce spherical aberration, coma and distortion at negative-infinite or near-infinite conjugate ratios
5. With the concave surface facing the longest conjugate distance
6. These lenses are thicker at the edge than in the centre and flat on one side. The plano-concave lenses are used to expand light beams or to increase focal lengths in optical systems. They are often employed for beam expansion of high peak power pulsed lasers. A beam incident on a concave surface will be focused to a point outside the instrument.

Air heating and ionization at the unwanted focal point are possible with attendant mode disruption or material damage. To avoid this problem, the input lens should be reversed so that no concave surface faces a parallel beam.

We also offer plano-convex lenses, which have negative focal length components and one concave surface. If there is any futher ideas to costom it, please feel free to contact us .