25.4mm Dia x 50.8mm FL, 355nm V-Coat, High Precision Laser Grade Aspheric Lens

Product Details Substrate Shape and Coating Optimized for Nd:YAG Laser Wavelengths High Precision Aspheric Surface Strehl Ratio > 0.8 TECHSPEC High Precision Laser Grade Aspheric Lenses are polished through precision magnetorheological finishing (MRF), providing them with an ultra-smooth aspheric surface with an aspheric surface tolerance of λ/40 RMS. The aberration free aspheric surfaces produced through this super-polishing process result in these aspheric lenses having diffraction-limited performance at their design wavelengths. A high-performance Laser Line V-Coat minimizes reflection when these aspheric lenses are used at their Nd:YAG wavelengths. TECHSPEC High Precision Laser Grade Aspheric Lenses feature substrates designed and shaped at their laser wavelength to optimize the entire lens design, not just the anti-reflection coating, for the laser wavelength. Standard imperial sizes of these laser grade aspheres with f/2 designs, made from fused silica, are available. Specifications General Type: Aspheric Lens Note: Strehl Ratio is >0.8 by design Physical & Mechanical Properties Diameter (mm): 25.40 +0.00/-0.05 Center Thickness CT (mm): 7.98 Edge Thickness ET (mm): 4.54 Clear Aperture CA (mm): 21.40 Centering (arcmin): <1 Shape of Back Surface: Plano Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): 50.80 @ 355nm Back Focal Length BFL (mm): 45.39 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Fused Silica (Corning 7980) f/#: 2 Numerical Aperture NA: 0.25 Abbe Number (v d ): 67.8 Index of Refraction (n d ): 1.458 Coating: Laser V-Coat (355nm) Coating Specification: R abs <0.25% @ 355nm Design Wavelength DWL (nm): 355 Focal Length Specification Wavelength (nm): 355 Aspheric Design Wavelength (nm): 355 Surface Quality: 10-5 Asphere Figure Error, RMS @ 632.8nm: λ/40 Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification. 7.5 J/cm 2 @ 355nm, 20ns, 20Hz Spot Size (μm): See Technical Information Tab Conjugate Distance: Infinite Power (diopters): 19.69 Material Properties Coefficient of Thermal Expansion CTE (10 -6 /°C): 0.52 Strehl Ratio: >0.8, by design Regulatory Compliance Certificate of Conformance: View ×