DL-15-20PNIR 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 a condensing lens for near infrared LD or YAG lasers (1,064 nm).
· Through the optimized lens design, the focal length barely changes across the near infrared range.
· The focal distances of 700 nm, 880 nm, and 1,100 nm are matched and optimized to minimize aberration.
· 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.
· 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 and spherical aberration will increase when used in the visible range. Also, transmittance may be negatively affected.
[Product Specifications]
· [ Common Specifications]
· Material: N-LAK22/SF6
· Design Wavelength: 700 nm 880 nm 1,100 nm
· Coating: Multilayer Anti-reflective Film (700-1,550 nm)
· Adhesive: UV Curable Adhesive
· Laser Yield Strength: 0.3 J/cm2
· Scratch-Dig: 40-20
· Effective Diameter: 90% of External Diameter
· [Individual Specifications]
· Outer diameter φD: φ15 mm
· Focal distance f: 19.9 mm
· Central thickness tc: 9.5 mm
· Rim thickness te: 6.6 mm
· Back focus fb: 14.7 mm
· Eccentricity: < 3'