Cemented Achromatic Lens, Operating Wavelength Band: 400-700 nm OLD2440-T2M
Achromatic lenses are usually made by cementing multiple optical elements, alternating positive lenses made of low-refractive-index materials such as crown glass with negative lenses made of high-refractive-index materials such as flint glass. These elements are selected and optimized so that the negative lenses correct the dispersion of the positive lenses, minimizing chromatic aberration. Achromatic lenses provide a nearly constant focal length within the operating wavelength band and therefore offer excellent off-axis performance. Compared with singlets, cemented achromatic lenses give users more design options and deliver excellent performance in visual imaging and laser beam manipulation applications. Our lenses are optimized by computer-aided design to minimize aberrations and provide small focused spots. JCOPTIX's visible achromatic lenses are designed for the visible hydrogen "F" line (486.1 nm, blue/green), helium "d" line (587.6 nm, yellow) and hydrogen "C" line (656.3 nm, red). Achromatic lenses outperform singlets in any monochromatic application within the visible wavelength band. Diffraction-limited spots can be formed when monochromatic sources such as lasers are used. JCOPTIX offers visible achromatic lenses with diameters of 12.7 mm, 25.4 mm and 50.8 mm. Different operating wavelength versions can be selected for the application: 400-700 nm, 650-1050 nm, 1050-1700 nm and 400-1100 nm. Antireflection coatings optimized for the operating wavelength band effectively reduce surface reflection, with an average reflectance below 1% per surface, and improve lens transmission. For other special customization requirements, please contact technical support.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | N-BK7/SF5 |
| Diameter | 25.4 mm |
| Clear Aperture Dimension | >90% of Diameter |
| Operating Wavelength | 400-700 nm |
| Focal Length | 74.9 mm |
| Back focal length | 70.3 mm |
| Design Wavelength | 486.1 nm、587.6 nm、656.3 nm |
| Radius of curvature 1 | 46.5 mm |
| Radius of curvature 2 | -33.9 mm |
| Radius of curvature 3 | -95.5 mm |
| Center Thickness | 9.5 mm |
| Center thickness 1 | 7.0 mm |
| Center thickness 2 | 2.5 mm |
| Edge Thickness | 6.9 mm |
| Coating | Antireflection Coating |
| Antireflection Coating R_avg [400-700 nm] | R_avg< 0.5% @ 400-700 nm |
| Diameter Tolerance | +0.00/-0.10 mm |
| Thickness Tolerance | ± 0.1 mm |
| Focal Length Tolerance | ± 1% |
| Decentration | < 3 arcmin |
| Surface figure PV value | λ/4 |
| Spherical surface fringe count | 3 |
| Surface quality (scratch/dig) | 40/20 |
| Mechanical housing | Standard lens tube SM1L12-A |
| Operating Temperature | -40 - +85 °C |
Key Features
Datasheet
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Supplier Information
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