Cemented Achromatic Lens, Operating Wavelength: 1050-1700 nm OLD2470-T4M
Achromats generally cement multiple elements, alternating positive low-index materials such as crown glass with negative high-index materials such as flint glass. Optimization lets the negative element compensate positive dispersion to minimize chromatic aberration. Nearly constant focal length across the band gives excellent off-axis performance. Compared with singlets, cemented achromats offer more design choices for imaging and laser beam control. Computer optimization minimizes aberrations and focal spots. JCOPTIX infrared achromats are designed at 1016 nm, 1330 nm, and 1550 nm and outperform singlets for monochromatic infrared applications, producing diffraction-limited laser spots. The source then describes JCOPTIX visible achromats with diameters of 12.7 mm, 25.4 mm, and 50.8 mm and operating options of 400-700 nm, 650-1050 nm, 1050-1700 nm, or 400-1100 nm. Band-optimized AR coatings reduce average reflection below 1% per surface to improve transmission. Contact technical support for other custom requirements.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | N-SF2/N-SF6 |
| Diameter | 25.4 mm |
| Clear Aperture Dimension | >90% of Diameter |
| Operating Wavelength | 1050-1700 nm |
| Focal Length | 299.9 mm |
| Back focal length | 285.8 mm |
| Design Wavelength | 1016 nm、1330 nm、1550 nm |
| Radius of curvature 1 | 52.5 mm |
| Radius of curvature 2 | -68.5 mm |
| Radius of curvature 3 | 112.2 mm |
| Center Thickness | 7 mm |
| Center thickness 1 | 4.5 mm |
| Center thickness 2 | 2.5 mm |
| Edge Thickness | 6.2 mm |
| Coating | Antireflection Coating |
| Antireflection Coating R_avg [1050-1713 nm] | R_avg< 0.5% @ 1050-1713 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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