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A double concave lens has negative focal length, thereby causing collimated incident light to diverge. Double concave lens has equal radius of curvature on both side of lens. They are generally used to expand light or increase focal length in existing system, such as beam expander and projection systems.
The double concave lens of BRD Optical has negative focal length, thereby causing collimated incident light to diverge. Double concave lens has equal radius of curvature on both side of lens.
| Material | Optical glass/ Fused silica/ sapphire etc. |
| Diameter | 2mm~300mm |
| Diameter tolerance | ±0.05mm(≤50mm) |
| ±0.1mm(＞50mm) | |
| Focal length | -50mm~-2000mm |
| Focal length tolerance | ±0.2%（＜10mm） |
| ±0.5%（＜10mm-1000mm） | |
| ±1%（＜＞1000mm） | |
| Center Thickness | 2mm~20mm |
| Surface quality | 60/40， 40/20， 20/10 |
| Surface accuracy | λ/2~λ/10@632.8nm，532nm |
| Clear Aperture | >85% dig diameter |
| Centration | <3arc min~ 30arc sec |
| Coating | As per customer’s request |
| Material | Diameter (mm) | Surface Radius 1 (mm) | Surface Radius 2 (mm) | Center Thickness (mm) | Focal Length (mm) |
| H-ZK3 | 5 | -14.4 | -14.4 | 3 | -9.8 |
| H-ZF6 | 8 | -7.2 | -30.5 | 5 | -7.4 |
| H-K9L | 10 | -11.1 | -11.1 | 2 | -10.4 |
| JGS1 | 10 | -9.25 | -9.25 | 1.25 | -9.8 |
| H-ZF7LA | 11 | -11.9 | -11.9 | 2 | -7.1 |
| H-K9L | 12 | -25.1 | -25.1 | 1.26 | -24 |
| BAF3 | 12 | -19.5 | -47.1 | 2 | -23.4 |
| ZF11 | 12 | -12.6 | -12.6 | 3 | -7.4 |
| H-K9L | 12.5 | -103 | -103 | 1.5 | -98.9 |
| H-ZF6 | 13 | -30.6 | -154 | 3 | -33.5 |
| H-LAK7 | 13 | -48.9 | -27.7 | 2 | -24.4 |
| H-ZK2 | 13 | -12.1 | -15.7 | 1 | -11.3 |
| H-ZF6 | 13.5 | -34.7 | -79.6 | 1.5 | -31.6 |
| H-ZF2 | 14 | -36.2 | -192 | 3 | -45 |
| H-ZF6 | 14 | -34.7 | -79.6 | 3 | -31.6 |
| H-LAK53A | 14 | -31.7 | -58.8 | 1.5 | -27 |
| H-K9L | 14 | -27.9 | -32.2 | 2 | -19 |
| H-ZF6 | 15 | -23 | -27.7 | 2.8 | -16.4 |
| H-ZF6 | 15 | -27.5 | -23.6 | 7.23 | -16.4 |
| H-F3 | 15 | -50.5 | -11.3 | 1.5 | -14.8 |
| N-SF6 | 15 | -13.2 | -12.1 | 2 | -7.4 |
| H-ZF3 | 16 | -30.6 | -15.8 | 3 | -14.6 |
| H-LAF50B | 16.7 | -16.8 | -17.8 | 1.8 | -11 |
| H-LAF50B | 17.3 | -37.2 | -37.2 | 3 | -23.9 |
| H-K9L | 20 | -299 | -85.4 | 2 | -128 |
| H-ZF52A | 20 | -51.6 | -21 | 1.9 | -16.7 |
| H-ZF6 | 21 | -77.4 | -77.4 | 2.5 | -51 |
| H-ZF7LA | 21 | -42.6 | -184 | 4.064 | -42.8 |
| H-ZF7LA | 22 | -255 | -16.2 | 9 | -18.7 |
| H-K9L | 24 | -11.1 | -90 | 1 | -18.9 |
| JGS1 | 25 | -92.1 | -92.1 | 2.5 | -100 |
| H-K9L | 25 | -52.1 | -52.1 | 3.5 | -50 |
| H-LAF4 | 25 | -38.4 | -38.4 | 8.4 | -25.4 |
| H-F4 | 25 | -36.7 | -29.2 | 3 | -25 |
| ZK9 | 27 | -149 | -52.9 | 1.45 | -62.7 |
| H-ZK21 | 28.6 | -281 | -23.8 | 3 | -35 |
| BaK2 | 29.5 | -2249 | -80.2 | 2 | -143 |
| JGS1 | 30 | -71 | -71 | 3 | -77 |
| BaK2 | 30.5 | -2249 | -76.4 | 2 | -137 |
| H-ZF3 | 32 | -11.8 | -284 | 2 | -15.7 |
| ZF1 | 41 | -692 | -170 | 2.8 | -211 |
| ZF7L | 44 | -153 | -49 | 3 | -45.8 |
| ZF4 | 54 | -340 | -249 | 2.5 | -197 |
| H-ZF3 | 58 | -73.8 | -234 | 4 | -77.8 |
| F4 | 60 | -74.9 | -78.4 | 1 | -61.3 |
| ZF1 | 65 | -516 | -163 | 5.49 | -190 |
| ZBaF3 | 65 | -296 | -52.4 | 2.5 | -67.5 |
| H-ZF2 | 68 | -83.5 | -249 | 5.5 | -92.3 |
| F13 | 68 | -2465 | -41.8 | 3 | -65.6 |
| H-F4 | 72 | -170 | -71.8 | 12 | -80 |
| H-K9L | 90 | -102 | -347 | 6 | -15 2 |
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