DLB-25-300 Lens

[Features]
· With a single lens made by adhering two lenses of different wavelength dispersing refractive indices, the chromatic and spherical aberration can be reduced compared to single spherical lenses.
· Usable as the objective lens in telescopes, the collimating lens in laser experiments, and so on.
· Through the optimized lens design, the focal length barely changes across the whole visible range.
· As both spherical aberration and chromatic aberration are well corrected, it is optimal as a laser collimating lens.
· Corrected not only for aberrations on the on-axis object point but also for off-axis coma aberration and astigmatism.
· In imaging systems, it can be used with telescope objective lenses and imaging lenses in microscopes.
· Selection can be made from a wide range of variations subdivided by outer diameter, focal distance, and so on, to suit the specifications.
· An air gap type condensing lens (NYTL/NYDL) for laser processing is also available.
· * Use achromatic lenses when imaging a picture with infinite distance as the focus or changing the positional light source to parallel light.
· * Sufficient optical performance cannot be obtained when used for imaging at a close distance, etc.
· * Achromatic lenses are oriented for incidence of parallel light.
· * Have parallel light incident from the surface with the smaller radius of curvature (the surface indicated by the arrow).
· * Having parallel light incident from the opposite side causes chromatic and spherical aberration, and enlarges the condensing spot.
· * Chromatic aberration may increase when used with wavelengths outside the visible range.
· * Also, transmittance may be negatively affected.
[Product Specifications]
· [ Common Specifications]
· Material: BK7, SF2
· Design Wavelength: Blue: 486.1 nm, Green: 546.1 nm, Red: 656.3 nm
· Coating: Anti-reflective Film
· Adhesive: UV Curable Adhesive
· Laser Yield Strength: 0.3 J/cm2 (Pulse Width 10 ns, Repetition Frequency 20 Hz)
· Scratch-Dig: 40-20
· Effective Diameter: 90% of External Diameter
· [Individual Specifications]
· Outer diameter φD: φ25 mm
· Focal distance f: 300 mm
· Rim thickness te: 5 mm
· Central thickness tc: 5.6 mm
· Back focus fb: 296.6 mm
· Eccentricity: < 3'