A flat concave lens is a lens with one side flat and one side concave, which has a negative focal length and is commonly used to diverge and collimate incident light beams.
Flat concave lenses have a negative focal length and are commonly used to diverge and collimate incident beams. In this case, the collimated beam should be incident on the surface to minimize the spherical aberration. Flat concave lenses can form virtual images, so they are commonly used as incident optical elements in Galileo beam expansion systems; This type of lens has ideal divergence, and then the beam is re collimated using a glued lens. In optical systems, researchers often carefully select optical components so that the aberrations introduced by positive and negative lenses are just offset. Some people also use paired lenses to increase the effective focal length of the focusing lens.
High reflectivity, R>99.5%
Specifications：
Dimension Tolerance： | +0/-0.2mm |
Thickness Tolerance： | ±0.2mm |
Surface Quality： | 60/40 scratch and dig |
Clear Aperture： | >90% |
Flatness： | <λ/4@632.8nm |
Centration： | <3 arc minutes |
Coating： | Dielectric HR coating on curved surface, R>99.5%, ground or inspection polished on flat surface |
Damage Threshold： | >5J/cm2, 20ns, 20Hz, @1064nm |
| Material: | BK7, Fused Silica, SF 10, CaF2, Sapphire .etc. |
| Paraxial Focal Length Tolerance: | ±2% |
| Dimension Tolerance: | ±0.2(General)； ±0.05(High Precision) |
| Centration: | <3 arc min |
| IRR: | λ/4@633nm（General)； λ/10@633nm(High Precision) |
| Clear Aperture: | >80%(Small Size)； >95%(Large Size) |
| Surface Figure | <1.5λ@633nm（General)； <λ/4@633nm(High Precision) |
| Surface Quality: | 60/40（General)； 10/5(High Precision) |
| Bevel: | <0.25mm |
| Coating: | Uncoated, AR,PR, HR, etc. |
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