The double-concave cylindrical lens is composed of two concave surfaces, and this structure causes light to have a specific refraction effect when passing through the lens. It is often used to change the design requirements of the imaging size, such as converting a spot to a line spot, or changing the height of the image without changing the width of the image.
Ray divergence characteristic: the curvature radius of the two sides of the double-concave cylindrical mirror is equal, which can make the parallel incident rays diverge outwards. This property makes double-concave cylindrical mirrors commonly used in optical systems for applications such as beam expansion and projection.
Imaging effect: The double-concave cylindrical mirror can change the size of the image, such as converting a spot into a line spot, or changing the height of the image without changing the width of the image. This property makes it widely used in linear detector lighting, barcode scanning, holographic lighting, optical information processing and other fields.
| Specifications | Commercial spec. | High precision spec. |
| Material | UV glass (quartz, fused silica） | |
| VIS glass (Schott, CDGM, HOYA,etc.) | ||
| Dimension | 5mm~350mm | |
| Dimension tolerance | ±0.1mm | ±0.05mm |
| Focal length tolerance | ±2% | ±1% |
| Surface quality | 60/40 | 40/20 |
| Centration | < 3 arc min | <1arc min |
| Surface figure | 3λ | 2λ |
| Surface irregularity | 1/4λ | 1/10λ |
| Clear aperture | >85% of dim | >90% of dim |
| Bevel | <0.2mm x 45deg | <0.1mm x 45deg |
| Coating | Up on clients' request | |
The double-concave cylindrical mirrors are also widely used in intense laser systems and synchrotron radiation beamlines, especially in high-precision test instruments and devices, such as the lumps of high-power laser resonators and long-distance line interferometers.
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