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| AL2520-C - Ø25 mm, f=20 mm, NA=0.543, S-LAH64 Aspheric Lens, ARC: 1050-1620 nm |
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| Product Summary: |
Features
- Precision-Polished for Exceptional Performance
- Diffraction-Limited Performance
- Low Dispersion Materials Minimize Chromatic Aberration
- Superior Energy Beam Distribution
- Corrected Wavefront Transmission: 20X to 50X Improvement Over Large-Diameter Molded Glass Aspheric Lenses
Thorlabs stocks precision-ground, large-diameter aspheric lens from Asphericon. The aspheric lens is manufactured using CNC grinding and polishing machines; for diameters in excess of 15 mm this produces lenses with RMS wavefront errors that are typically 20 to 50 times less than a similarly sized molded aspheric lens. The lens is constructed using S-LAH64 or N-BK7 optical glass. Ohara's S-LAH64 optical glass is a low-dispersion glass with high index of refraction in order to minimize chromatic aberration.
Specifications
- Design Wavelength: 780 nm
- RMS Wavefront Error: ≤ 0.5 µm, < 0.75 µm 0200)
- Surface Quality: 60-40 Scratch-Dig
- Coating Designation: -C
- Wavelength Range: 1050 - 1620 nm
- EFL: 20 mm
- NA: 0.543
- D: 25 mm
- CA (Collimation): 22.5 mm
- CA (Focusing): 20.32 mm
- WD: 15.70 mm
- Center Thickness: 7.65 mm
- Refraction Index (@780 nm): 1.788
- Abbe #: 47.3
- f/d: 0.8
- Lens Material: S-LAH64
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