Biconvex Lens, N-BK7, AR Coating T3: 650-1100 nm OLX240138-T3M
Biconvex lenses have a positive focal length and can focus parallel rays to a point, so their function is similar to that of plano-convex lenses. Both surfaces are spherical and have the same radius of curvature, minimizing spherical aberration. Biconvex lenses are therefore the optimal choice when the object and image distances from the lens are equal or approximately equal, corresponding to 1:1 magnification. Spherical aberration is minimized, while coma, distortion and chromatic aberration are also canceled by symmetry. Biconvex lenses have the lowest aberration for conjugate ratios between 5:1 and 1:5. Outside this magnification range, plano-convex lenses are generally more suitable. This plano-convex lens offered by JCOPTIX is made of N-BK7 glass. N-BK7 is the most common borosilicate crown optical glass, offering excellent optical performance at a moderate price. N-BK7 has high homogeneity, few bubbles, low impurity levels and easy manufacturability, making it an excellent lens material for visible and near-infrared applications. N-BK7 is often used instead of UV fused silica when high UV transmission and a lower coefficient of thermal expansion are not required. JCOPTIX offers biconvex lenses with a diameter of 25.4 mm. Uncoated versions provide a wide operating wavelength range and a high damage threshold. Versions with antireflection coatings on both surfaces are also available for operating wavelengths of 350-700 nm, 650-1100 nm or 1050-1700 nm. The antireflection coatings effectively reduce surface reflection within the operating wavelength range, with an average reflectance below 0.5% 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 |
| Diameter | 25.4 mm |
| Clear Aperture Dimension | >90% of Diameter |
| Operating Wavelength | 650-1100 nm |
| Focal Length | 60.0 mm |
| Back focal length | 58.4 mm |
| Optical power | 16.7 |
| Abbe Number v_d | v_d=64.17 |
| Design Wavelength | 587.6 nm |
| Refractive Index | 1.515 |
| Radius | 61.0 mm |
| Center Thickness | 4.7 mm |
| Edge Thickness | 2.0 mm |
| Coating | Antireflection Coating |
| Antireflection Coating R_avg [650-1100 nm] | R_avg< 0.5% @ 650-1100 nm |
| Damage Threshold [1030 nm，230 fs，10 Hz] | 0.2 J/cm² ，1030 nm，230 fs，10 Hz |
| 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 SM1L6-A |
Key Features
Datasheet
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