Precision Achromatic Doublet Lenses
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Precision Achromatic Doublet Lenses - 1

O p t i c s 467 Email: sales@newport.com • Web: newport.com TECHNICAL REFERENCE AND FUNDAMENTAL APPLICATIONS LENS SELECTION GUIDE SPHERICAL LENSES CYLINDRICAL AND SPECIALTY LENSES OPTICS SETS OPTICAL SYSTEMS MIRRORS PRISMS Precision Achromatic Doublet Lenses Our achromats are computer designed to effectively minimize spherical aberration and coma when operating at infinite conjugate ratio, yielding smaller focused spot sizes. Unlike singlet lenses, this results in a constant focal length independent of aperture and far better off-axis performance. Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength. Specifications Focal Length at 589 nm ±2 % Material Optical crown and flint glasses or equivalent Wavelength 400–2500 nm Transmission T>95% visible, T>92% at 1064 nm Design Wavelengths 486.1, 546.1, and 656.3 nm Surface Accuracy 3 fringes (1.5 ë) power, 1/2 fringe (ë/4) irregularity at 632.8 nm over the clear aperture Clear Aperture central 90% of diameter Surface Quality 40-20 scratch-dig Centration, Spherical Lenses 3 arc min Diameter Tolerance +0/-0.1 mm Center Thickness (Tc = Tc1 + Tc2) Tolerance ±0.2 mm for lenses <50.8 mm diameter ±0.4 mm for lenses 50.8 mm diameter ±0.3 mm for PAC076 Edge Thickness (Te) Nominal Value Antireflection Coating Single-layer MgF2: Ravg <1.5%, Rmax <2.5% per surface, 400–700 nm; Multi-layer AR.14: Ravg <0.5%, Rmax <1.5% per surface, 430–700 nm Optimum Field of View 2° Temperature 125 °C, cement limitation Durability MIL-M-13508, MIL-C-675C, MIL-C-14806 Orientation Steepest convex surface should face the infinite conjugate Cleaning Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (see page 622) Cemented optic, do not immerse in a solvent Damage Threshold 750 W/cm2 CW, 0.75 J/cm2 with 10 nsec pulses, typical, cement limitation • Superior performance to singlet lenses • Nearly constant focal length across the visible spectrum • Far superior off-axis performance • Multi-layer or single-layer AR coatings • Standard diameters and focal lengths interchange with our singlet lenses Tc Te FFL BFL EFL EFL MgF2 400 450 500 550 600 650 700 0° 3.0 2.0 1.0 0 Reflectance (%) Wavelength (nm) Typical AR.14 Broadband VIS AR Coating 400 450 500 550 600 650 700 3.0 2.0 1.0 0 0° Reflectance (%) Wavelength (nm) Typical LP Series Multi-Axis Translators page 679 LH Series Lens Mounts page 669

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