Custom Plano-Concave Lenses

Plano-Concave Lenses have edges that are thicker than the center and flat on one side. Plano-concave lenses are used to expand a light beam or increase the focal length in an optical system. They are commonly used for beam expansion of high peak power pulsed lasers. The beam incident on the concave surface will be focused to a point outside the instrument. Unwanted air heating and ionization at the focal point may accompany mode disruption or material damage. To avoid this problem, the input lens should be inverted so that the concave surface is not facing the parallel beam. Material selection: optical glass, laser crystal, fused silica, anti-radiation glass, infrared and ultraviolet materials, metal materials Strict dimensional control standards custom coating Wide selection of RZ spherical lenses made of N-BK7, UVFS or CaF2 optical materials, spherical lenses made of N-BK7, UVFS or S-LAH64 optical materials, cylinders and cones (shafts) made of N-BK7 and UVFS cone) lens. The lens forms are plano-convex, plano-concave, double-convex, double-concave, plano-convex cylinder and plano-concave cylinder. Focal lengths vary from -5000 to +10000 mm. Other specific materials, sizes and anti-reflective (AR) coated lenses are available upon request. Factory Standard Shape: Plano-Concave Diameter Tolerance: ± 0.05mm Thickness Tolerance: ± 0.05mm Radius: ± 0.3% Focal Length Tolerance: ± 1% Surface Quality: 40-20 Scratch-Dig(After Coating) Surface Flatness: λ/4 @633 nm Centration: < 3 arc minutes Clear Aperture: > 95% of central dimension