25mm Dia -0.50λ Aberration, Spherical Aberration Plate

Product Details Precision N-BK7 Substrate Optimized for Use in Collimated Light with Small Fields of View Transmitted Wave Front Accurate to λ/16 Many optical systems experience some level of spherical aberrations which result in a loss of image quality and overall system performance. Our line of TECHSPEC Spherical Aberration Compensation Plates are designed to compensate and correct known amounts of spherical aberration at the specified wavelengths. The aberration plates should be used in collimated space and placed near a pupil. They are excellent for correcting spherical aberrations in systems that have small fields of view. Spherical Aberration Compensation Plates can be combined to induce the desired amount of compensatory spherical aberration. Negative sign plates create over corrected spherical aberration. Positive plates create under corrected spherical aberration. Note: The arrow on the spherical aberration compensation plates points in the direction of light travel. Specifications General Type: Specialty Window Type of Window: Glass Physical & Mechanical Properties Clear Aperture CA (mm): 21.25 Diameter (mm): 25.00 +0.00/-0.25 Thickness (mm): 4.00 ±0.20 Parallelism (arcmin): <1 Dimensional Tolerance (mm): +0.00/-0.25 Bevel: Protective as needed Clear Aperture (%): >85 Edges: Fine Ground Poisson’s Ratio: 0.21 Young’s Modulus (GPa): 82 Knoop Hardness (kg/mm 2 ): 610.00 Knoop Hardness (GPa): 610 Optical Properties Coating: Uncoated Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 Index of Refraction (n d ): 1.516 Surface Quality: 60-40 Abbe Number (v d ): 64.17 Aberration: -0.50λ ±λ/16 @ 587nm Wavelength Range (nm): 350 – 2200 Material Properties Density (g/cm 3 ): 2.51 Coefficient of Thermal Expansion CTE (10 -6 /°C): 7.1 (-30 to +70°C) 8.3 (+20 to +300°C) Regulatory Compliance Certificate of Conformance: View ×