AGL-40-GA-30P Aspherical Lens

[Features]
· A precisely polished, non-spherical lens which, when a plane wave is incident, is capable of concentrating the beam to roughly the size of the diffraction limit.
· Used when light from semiconductor lasers is turned into parallel light, for example, and when parallel light is concentrated by fibers.
· By enlarging the NA (numerical aperture), light can be efficiently concentrated.
· The AGL-EA/AGL-GA series have been made available with profile error kept at 0.1 µm or less, and the AGL-EB/AGL-GB series with profile error of 0.5 µm or less.
· Lens holders (LHF-S, LHA) for fixing lenses are available.
· * The aspheric lens has an orientation for light incidence.
· * Be sure to have parallel light incident from the convex surface for use.
· * Having parallel light incident from the flat side causes the spherical aberration to increase, so that light cannot be condensed into a small area.
· * If used with wavelengths outside the design wavelength range, spherical aberration occurs and the condensing spot cannot be narrowed to the diffraction limit .
· * This precision polished aspheric lens is not an achromatized lens.
· * The focal length (back focus) will vary when the product is used for wavelengths other than the measurement wavelengths.
· * The lens does not have an antireflection coating and thus has loss due to reflections at the front and rear surfaces, providing a transmittance of 85% or less.
[Product Specifications]
· [ Common Specifications]
· Material: S-LAH64
· Refractive Index: 1.792 (546.1 nm), 1.777 (780 nm)
· Abbe Number ν d: 47.37
· Reverse Face Shape: Plane surface
· Eccentricity: < 3'
· Coating: Non-Coated
· Effective Diameter: 90% of External Diameter
· Scratch-Dig: 60-40
· [Individual Specifications]
· Design Wavelength: 780 nm
· Outer diameter φD: φ40 mm
· Focal distance f: 30 mm
· Back focus fb: 22.40 mm
· NA: 0.61
· Rim thickness te: 4.38 mm
· Central thickness tc: 13.5 mm
· Profile Error: < 0.1 µm