S-SLB-40B-50PM Biconvex Lens

[Features]
· A product with surface quality one level below the spherical convex lens (SLB-P).
· Usable for optical systems that do not require high surface quality, such as for lighting or observation.
· Specifications other than the surface quality are almost the same as the spherical convex lens (SLB-P).
· With the exception of high-precision experiments using lasers, we recommend this lens.
· A bi-convex lens that's widely refracted to shorten the focal length.
· In addition to the non-coated product, three types of lenses with anti-reflective coating for the visible range, near-infrared range, and infrared range are available.
· * Spherical surface planoconvex lenses and spherical surface biconvex lenses have chromatic aberration, resulting in focal lengths changing with wavelength.
· * The planoconvex lens has an orientation for light incidence.
· * Be sure to have parallel light incident from the convex surface.
· * When reversed, spherical aberration may increase and the condensing spot may widen or images may be out of focus.
· * Non-coated products have loss due to reflections at the front and rear surfaces, with a transmittance of about 90%.
[Product Specifications]
· [ Common Specifications]
· Material: BK7
· Design Wavelength: 546.1 nm
· Refractive Index: n e = 1.519
· Eccentricity: < 3'
· Coating: Anti-reflective Film (400-700 nm)
· Transmittance: > Average 99%
· Laser Yield Strength (Reference Value): 4 J/cm^2 (Pulse Width 10 ns, Repetition Frequency 20 Hz)
· Effective diameter: 85% of the outer diameter (83% of the outer diameter for φD < φ10 mm)
· Scratch-Dig: 60-40
· [Individual Specifications]
· Antireflection Film Coating Wavelength Region: 400-700 nm
· Outer diameter φD: φ40 mm
· Focal distance f: 51.7 mm
· Rim thickness te: 2 mm
· Central thickness tc: 10.0 mm
· Back focus fb: 48.3 mm
· Radius of the curvature r: 51.90 mm