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| Design Wavelength | 408 nm | Magnification | Infinite | 
| Numerical Aperture | 0.6 | Window Thickness | 0.25 mm | 
| Clear Aperture | 4.80 mm | Laser Window Material / Index | N-BK7/1.5 | 
| Effective Focal Length | 4.02 mm | Glass | ECO-550 | 
| Working Distance | 2.37 mm | Surface Quality | 40-20 Scratch-Dig(Entire Bulk Material) | 
| 352671-A | |||||||||
| C671TME-A | 
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| Vd number | 50.28 | 
|---|---|
| CTE (10-6 / °C) | 11.62 | 
| Thermo optic coefficient (10-6 / °C) (Δn/ΔT) | 2.39 | 
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| z | SAG as a Function of Y | A4 | 4th Order Aspheric Coefficient | 
| R | Radius of Curvature | A6 | 6th Order Aspheric Coefficient | 
| k | Conic Constant | A8 | 8th Order Aspheric Coefficient | 
| A2 | 2nd Order Aspheric Coefficient | An | nth Order Aspheric Coefficient | 
