18mm Dia., 0.60 NA, 350-700nm Coated, NIR Aspheric Lens

Product Details Optimized for Applications in the NIR Uncoated or AR coated versions available Multiple Design Wavelengths Available TECHSPEC Near-Infrared (NIR) Aspheric Lenses are optimized to eliminate spherical aberration in the near-infrared. Manufactured from S-LAH64 or N-BK7 substrates and polished through a computer numerical controlled (CNC) process, these aspheric lenses achieve high precision performance across the NIR spectrum. These NIR aspheric lenses include uncoated substrates designed at 780nm with coating options at 350-700nm, 600-1050nm, or 900-1700nm. TECHSPEC Near-Infrared (NIR) Aspheric Lenses are available with low numerical aperture designs for applications that require beam shape to be maintained as well as high numerical aperture designs for light-gathering applications. For custom designed CNC polished aspheric lenses, please contact us. Specifications General Type: Aspheric Lens Physical & Mechanical Properties Diameter (mm): 18.00 +0.00/-0.10 Center Thickness CT (mm): 6.20 ±0.10 Edge Thickness ET (mm): 2.55 Clear Aperture CA (mm): 16.2 Centering (arcmin): <3 Shape of Back Surface: Plano Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): 15.00 @ 780nm Back Focal Length BFL (mm): 11.51 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More S-LAH64 f/#: 0.83 Numerical Aperture NA: 0.60 Abbe Number (v d ): 47.37 Index of Refraction (n d ): 1.788 Coating: VIS+ (350-700nm) Coating Specification: R avg < 0.5% @ 350 - 700nm @ 0° ±30° AOI R abs < 1.5% @ 350 - 700nm @ 0° ±30° AOI Wavelength Range (nm): 350 - 700 Aspheric Design Wavelength (nm): 780 Surface Quality: 40-20 Asphere Figure Error, RMS @ 632.8nm: 1.2λ Conjugate Distance: Infinite Power (diopters): 66.67 Material Properties Coefficient of Thermal Expansion CTE (10 -6 /°C): 6.1 Regulatory Compliance Certificate of Conformance: View ×