25mm Dia. x 50mm EFL, Uncoated, Sapphire Aspheric Lens

Product Details Durable Sapphire Substrates Ideal For Material Processing and Advanced Manufacturing Uncoated and 1064nm Laser Line V-Coated Versions Available Diffraction Limited Performance at 1064nm Sapphire Aspheric Lenses are designed for precision performance in high power applications. Utilizing durable sapphire substrates, these lenses decrease contamination effects on laser performance and feature better thermal conductivity, lower thermally induced focal shift, and faster induced focal shift rise time than fused silica. Designed with material processing and advanced manufacturing in mind, their aspheric surfaces provide diffraction limited performance at 1064nm. Sapphire Aspheric lenses are available uncoated, with a standard laser v-coat, or with custom coatings available upon request. Note: Exercise caution when using Sapphire Aspheric Lenses in ultrafast laser applications as sapphire can cause non-linear effects. Specifications Physical & Mechanical Properties Diameter (mm): 25.00 +0/-0.1 Center Thickness CT (mm): 4.10 ±0.10 Clear Aperture CA (mm): 22.5 Centering (arcmin): 3 Bevel: 0.5 x 45° Surface Roughness (Å): 40 Poisson’s Ratio: 0.27 Young’s Modulus (GPa): 435 Optical Properties Effective Focal Length EFL (mm): 50.00 Back Focal Length BFL (mm): 47.66 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Sapphire (Al 2 O 3 ) f/#: 2 Numerical Aperture NA: 0.25 Coating Aperture (mm): 22.5 Index of Refraction (n d ): 1.77 Coating: Uncoated Design Wavelength DWL (nm): 1064 Surface Quality: 40-20 Power (P-V) @ 632.8nm: 1λ Irregularity (P-V) @ 632.8nm: 0.5λ Material Properties Coefficient of Thermal Expansion CTE (10 -6 /°C): 8.8 Density (g/cm 3 ): 3.97 Regulatory Compliance Certificate of Conformance: View ×