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Simple and economical solutions for optical fibre coupling. Download complete lens catalogue (2MB) BK7 Drum (Barrel) Lenses back to overview A modification of the ball lens, the drum lens is much easier to mount and orient, especially when coated. | Material: | BK7 grade A optical glass |  | | Diameter Tolerance: | +0.0/-0.05mm | | Length (L): | ±0.005% | | Surface Quality: | 40/20 scratch-dig | | Coatings: | without coating | (if you require an AR coating, please specify with your order) |
| Order No. | Diameter (mm) | L (mm) | DL-BK7-020-025 | 2.0 | 2.5 | DL-BK7-020-030 | 2.0 | 3.0 | DL-BK7-030-040 | 3.0 | 4.0 | DL-BK7-040-050 | 4.0 | 5.0 | DL-BK7-050-080 | 5.0 | 8.0 |
BK7 Ball Lenses back to overview Most useful when coating is not an issue. Very tight diameter tolerance for accurate fibre coupling. | Material: | BK7 grade A optical glass |  | | Diameter Tolerance: | +/-0.005mm | | Sphericity: | ±0.003% | | Surface Quality: | 40/20 scratch-dig | | Coatings: | without coating | (if you require an AR coating, please specify with your order) |
| Order No. | Diameter (mm) | BL-BK7-001 | 1.00 | BL-BK7-002 | 2.00 | BL-BK7-003 | 3.00 | BL-BK7-004 | 4.00 | BL-BK7-005 | 5.00 | BL-BK7-006 | 6.00 | BL-BK7-007 | 7.00 | BL-BK7-008 | 8.00 | BL-BK7-009 | 9.00 | BL-BK7-010 | 10.00 |
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