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 lensesmade 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
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