LightPath 390028 | 8mm Dia., 0.56 NA, BBAR (3000-5000nm), Molded IR Aspheric Lens

Product Details Wavelength Range of 1.8 – 12μm Variety of Coating Options Mounted and Unmounted Versions LightPath Mid-Wave and Long-Wave Infrared (IR) Aspheric Lenses feature a low-cost, molded design and offer several key benefits over Germanium substrate aspheres. With a dn/dT and CTE significantly less than that of Germanium, the lenses feature a smaller change in focal length as a function of temperature change. Featuring a higher operating temperature than Germanium (which suffers 20 – 30% transmission loss at 100°C), the lenses can be used in applications including collimators for QCL lasers and as components within thermal imaging assemblies. LightPath Mid-Wave and Long-Wave Infrared (IR) Aspheric Lenses have a wavelength range of 1.8 – 12μm. These lenses are available mounted or unmounted, in a variety of coating options. Specifications General Type: Aspheric Lens Lightpath Lens Code: 390028 Physical & Mechanical Properties Diameter (mm): 8.00 ±0.015 Center Thickness CT (mm): 2.50 Edge Thickness ET (mm): 1.65 Clear Aperture CA (mm): 7.60 Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): 5.95 @ 4100nm Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Black Diamond BD-2 (Ge 28 Sb 12 Se 60 ) f/#: 0.89 Numerical Aperture NA: 0.56 Index of Refraction (n d ) @ 4μm: 2.6210 Index of Refraction (n d ) @ 5μm: 2.6173 Index of Refraction (n d ) @ 10μm: 2.6023 Index of Refraction (n d ) @ 14μm: 2.5843 Coating: BBAR (3000-5000nm) Coating Specification: R avg <1.0% @ 3 - 5μm Wavelength Range (nm): 3000 - 5000 Focal Length Specification Wavelength (nm): 4100 Aspheric Design Wavelength (nm): 4100 Working Distance (mm): 5.00 Surface Quality: 80-50 Conjugate Distance: Infinite Material Properties Coefficient of Thermal Expansion CTE (10 -6 /°C): 14.00 Density (g/cm 3 ): 4.68 Thermo-optic coefficient dn/dT: 70 x 10 -6 /°C from -40° to +80°C (5 - 14 μm) Transformation Temperature (°C): 285.00 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 247: Compliant ×