SLB-50.8B-60N Spherical Biconcave Lens

[Features]
· With both faces concave, this lens can efficiently refract light in a restricted space, and spread the light widely.
· It can be used in cases where the irradiation area of the illuminating light is expanded.
· A BK7 lens for the visible range to the near infrared range.
· Three types of lenses with antireflection coating in the visible range, near-infrared range, and infrared range are available.
· Selection can be made from a wide range of variations subdivided by outer diameter, focal distance, and so on, to suit the specifications.
· * A concave lens itself cannot concentrate light or form an actual image.
· * Use in combination with a convex lens.
· * Spherical surface biconcave lenses have chromatic aberration, resulting in focal lengths changing with wavelength.
· * If a high-energy pulse laser is used, a focal point may be created on the optical path due to reflected light from the concave surface and sparking may occur.
· * Use a planoconcave lens when using a pulse laser.
[Product Specifications]
· [ Common Specifications]
· Material: BK7
· Design Wavelength: 546.1 nm
· Refractive Index: n e = 1.519
· Coating: Non-Coated
· Effective Diameter: 90% of External Diameter
· Scratch-Dig: 20-10
· [Individual Specifications]
· Antireflection Film Coating Wavelength Region: Not Coated
· Outer diameter φD: φ50.8 mm
· Focal distance f: -59.5 mm
· Rim thickness te: 13.8 mm
· Central thickness tc: 3 mm
· Back focus fb: -60.5 mm
· Radius of the curvature r: 62.28 mm
· Eccentricity: < 1'