Plano-Convex Lens, UVFS, AR Coating T1: 245-400 nm OLC240269-T1
A plano-convex lens has a positive focal length and can focus parallel rays to a single point or collimate light emitted by a point source. When the object and image distances from the lens are unequal and an absolute magnification below 0.2 or above 5 is required, the asymmetry of this lens shape minimizes spherical aberration. The optimal case is to place the object at infinity, so that rays enter the lens in parallel and ultimately form an image at the focal point. This plano-convex lens offered by JCOPTIX is made of UV fused silica. UV fused silica is extremely high-purity synthetic amorphous silicon dioxide with maximum transmission over the 185 to 2100 nm wavelength range. This colorless amorphous silica glass combines an extremely low coefficient of thermal expansion with good optical performance. It offers excellent UV transmission, does not fluoresce under UV light and is radiation-resistant. Compared with other optical glasses such as N-BK7, UV fused silica has a lower refractive index at certain wavelengths, a lower coefficient of thermal expansion and better homogeneity. It is suitable for deep-UV applications requiring higher transmission than N-BK7. JCOPTIX offers plano-convex lenses with a diameter of 25.4 mm. Uncoated versions provide a wide operating wavelength range and a high damage threshold. Antireflection-coated versions are also available for operating wavelengths of 245-400 nm, 350-700 nm or 650-1100 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 | UV Fused Silica |
| Diameter | 25.4 mm |
| Clear Aperture Dimension [of Diameter] | >90% of Diameter |
| Operating Wavelength | 245-400 nm |
| Focal Length | 250.9 mm |
| Back focal length | 249.0 mm |
| Optical power | 4 |
| Abbe Number v_d | v_d=67.82 |
| Design Wavelength | 587.6 nm |
| Refractive Index | 1.46 |
| Radius | 115.0 mm |
| Center Thickness | 2.7 mm |
| Edge Thickness | 2.0 mm |
| Coating | Antireflection Coating |
| Antireflection Coating R_avg [@ 245-400 nm] | R_avg< 0.5% @ 245-400 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 flatness [@633 nm] | λ/2 |
| Surface quality (scratch/dig) | 40/20 |
Key Features
Datasheet
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