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MICRO-CONTROLE / Spectra-Physics
Precision Achromatic Doublet Lenses

Precision Achromatic Doublet Lenses

Product catalog summary

Technical Reference and Fundamental Applications

This document serves as a comprehensive guide for selecting lenses, including spherical, cylindrical, and specialty lenses, as well as optics sets and optical systems. It provides detailed specifications and applications for precision achromatic doublet lenses, which are designed to minimize spherical aberration and coma, offering superior performance compared to singlet lenses.

Specifications

Focal Length: 589 nm ±2%
Material: Optical crown and flint glasses or equivalent
Wavelength Range: 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 λ) power, 1/2 fringe (λ/4) irregularity at 632.8 nm
Clear Aperture: ≥central 90% of diameter
Surface Quality: 40-20 scratch-dig
Centration: ≤3 arc min
Diameter Tolerance: +0/-0.1 mm
Center Thickness Tolerance: ±0.2 mm for lenses <50.8 mm diameter, ±0.4 mm for lenses ≥50.8 mm diameter
Antireflection Coating: Single-layer MgF2 and Multi-layer AR.14
Temperature Limit: 125 °C
Durability Standards: MIL-M-13508, MIL-C-675C, MIL-C-14806
Cleaning: Non-abrasive method recommended
Damage Threshold: 750 W/cm2 CW, 0.75 J/cm2 with 10 nsec pulses

Ordering Information

To order lenses with specific coatings, model numbers are used. For example, "PAC052" indicates a 25.4 mm diameter lens with a 100 mm effective focal length and MgF2 coating. Adding "AR.14" to the model number specifies the AR.14 coating.

Lens Models and Specifications

The document includes a detailed table listing various lens models, their diameters, effective focal lengths (EFL), back focal lengths (BFL), front focal lengths (FFL), center thicknesses (Tc), edge thicknesses (Te), and glass types. Each model is optimized for specific applications, with some designed for 1:1 imaging and diffraction-limited performance at certain wavelengths.

Catalog excerpts

O p t i c s 467 Email: [email protected] • 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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