Double concave lens:
Double concave lenses have a negative focal length and are typically used to increase the divergence of aggregated light.
| Outer diameter | 25.40 |
|---|---|
| coating film | A：BBAR Ravg ＜ 1% |
| material | H-K9L(Schott BK7) |
| design wavelength | 632.8nm |
| Focal length tolerance | ±1% |
| Profile Tolerance | +0.0/-0.1mm |
| Tolerance | ±0.1mm |
| Facial shape | λ/4@632.8nm |
| finish | 60/40 |
| eccentric | ＜3arc min |
| Effective aperture | ＞90% |
| Chamfer | ＜0.2×45° |
| effective focal length | -75.00 |
| Curvature radius | -77.86 |
| back focal length | -76.15 |
| Center Thickness | 3.50 |
| Edge thickness | 3.50 5.60 |
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