Plano-Convex Cylindrical Lenses,UV Fused Silica
Product Description:
Plano-Convex Cylindrical Lenses are deigned to focus a beam in one dimension and keep the other unchanged.
UV-grade fused silica offers high transmission in the deep UV and exhibits virtually no laser-induced fluorescence (measured at 193nm), making it an ideal choice for applications from the UV to the near IR. These positive cylindrical lenses are good for usage requiring magnification in one dimension. While spherical lenses act symmetrically in two dimensions on an incident ray, cylindrical lenses to provide anamorphic shaping of a beam. A pair of positive cylindrical lenses can be used to collimate and circularize the output of a laser diode. Another application would be to use a single lens to focus a diverging beam on to a detector array. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface when focusing into a line and a line source should be incident on the plano surface to form a collimated line.
Material: UV Fused Silica etc.
Coating: Uncoated or with a broadband AR coating for the UV, 245-400nm.
Focal lengths: 8.0mm-499.9mm.
Applications: Collimate and circularize the output of a laser diode
Couple light into a slit
1D image compression
Anamophic beam shaping
Photonchina Specifications |
||
| Substrate Material | UV Fused Silica | |
| Focal length
Broadband AR Coating |
8.0 mm – 499.9 mm
Uncoated :185nm-2.1um; UV Coated:245-400nm |
|
| Avg Reflectance over Coating Range |
< 0.5% | |
| Design Wavelength | 546 nm | |
| Length Tolerance | +0.0 / -0.1 mm | |
| Height Tolerance | +0.0 / -0.1 mm | |
| Center Thickness Tolerance | ±0.1 mm | |
| Focal Length Tolerance | ±1% | |
| Surface Quality | 60-40 or better | |
| Damage Threshold | 5 J/cm2 (355 nm, 10 ns, 10 Hz, Ø0.350 mm) |
|
| Centration | For f ≤50 mm: < 5 arcmin For f >50 mm: < 3 arcmin |
|
| SurfaceFlatness (Plano Side) |
Height | λ/2 |
| Length | λ/2 | |
|
CylindricalSurface |
Height |
3λ/2 |
| Length | 3λ/2 | |
| Irregularity (Peak to Valley) |
Height (Plano,Convex) |
λ/4, λ |
| Length (Plano,Convex) | λ/4, λ/cm | |
| Clear Aperture | >90% of Surface Dimensions | |
Note:
- Reflectance of lens uncoated should be around 4%(per surface).
- Much like surface flatness for flat optics, surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source. This specification is also commonly referred to as surface fit.
About coating and threshold
About coating: these high performance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges. The central peak in each curve is less than 0.25%. These coatings provide good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). For optics intended to be used at large angles, Photonchina provides a custom coating optimized at a 45° angle of incidence; this custom coating is effective from 25° to 52°.
About Damage Thresholds: when choosing optics, it is critical to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Photonchina have to mention, however, the explanation here should be based on room temperature operation and optics in good condition (i.e., within scratch-dig spec, surface free of contamination, etc.), because dust or other particles on the surface of an optic can cause damage at lower thresholds.