| Material | BK7, Borosilicate, Fused Silica, Sapphire, CaF2, ZnSe, Ruby, B270, Quartz |
|---|---|
| Diameter | φ 0.4-30mm |
| Surface quality | 60/40, 40/20, 20/10 |
| Dia tolerace | ±0.2μm |
| Sphericity | ＜0.2μm |
Glass ball lenses are widely used for coupling fiber and semiconductor lasers, or photodetectors. It’s much smaller than a normal lens, and it’s completely polished, so be careful when using it. But it can reduce the size and weight of the device. With a positive focal length, used at the unit conjugate point, can eliminate all kinds of aberration.
BK7(K9), uv grade fused silica(UVFS), sapphire is the most common material for making ball lenses.
1. UVFS is stable used for UV, VIS and NIR applications.
2. BK7(K9) is used for visible light.
3. Sapphire provide better transmission, which is used for UV and IR applications.
D: glass ball lens diameter
d: light input diameter
EFL: effective focal length
BFL: back focal length
n: refractive index of optical material
NA: numerical aperture
EFL=nD/4(n-1)
BFL=EFL-D/2
NA=2d(n-1)/nD
| Item No. | Material | Diameter(mm) | EFL(mm) | BFL(mm) |
|---|---|---|---|---|
| GBL001 | H-K9L | 1.00 | 0.73 | 0.23 |
| GBL002 | H-K9L | 2.00 | 1.47 | 0.47 |
| GBL003 | H-K9L | 3.00 | 2.20 | 0.70 |
| GBL004 | H-K9L | 4.00 | 2.93 | 0.93 |
| GBL005 | H-K9L | 5.00 | 3.67 | 1.17 |
| GBL006 | H-K9L | 6.00 | 4.40 | 1.40 |
| GBL007 | H-K9L | 7.00 | 5.14 | 1.64 |
| GBL008 | H-K9L | 8.00 | 5.87 | 1.87 |
| GBL009 | H-K9L | 9.00 | 6.60 | 2.10 |
| GBL010 | H-K9L | 10.00 | 7.34 | 2.34 |
| GBL011 | UVFS | 1.00 | 0.79 | 0.29 |
| GBL012 | UVFS | 2.00 | 1.59 | 0.59 |
| GBL013 | UVFS | 3.00 | 2.39 | 0.89 |
| GBL014 | UVFS | 4.00 | 3.18 | 1.18 |
| GBL015 | UVFS | 5.00 | 3.98 | 1.48 |
| GBL016 | UVFS | 6.00 | 4.77 | 1.77 |
| GBL017 | UVFS | 7.00 | 5.57 | 2.07 |
| GBL018 | UVFS | 8.00 | 6.36 | 2.36 |
| GBL019 | UVFS | 9.00 | 7.16 | 2.66 |
| GBL020 | UVFS | 10.00 | 7.95 | 2.95 |
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