BALL & DRUM LENSES - Tower Optical - #1

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23 561-740-2525 • Fax 561-740-2518 sales@TowerOptical.com • www.TowerOptical.com Cage Code: 1N2U3 SDVO-SB ITAR Compliant Dia. L Ball and Drum Lenses Specifications Material: BK7 grade A or equivalent or UV fused silica Diameter tolerance: ±0.01 mm Sphericity: ±0.003 mm Surface quality: 40-20 Scratch-Dig Coating: none Ball Lenses are used for various tasks such as improving the coupling between optical fibers and the emitters or detectors they interface with. Standard size lenses range from 1.0 mm to 5.0 mm. Custom-made sizes or special materials are also available. All ball lenses can be ordered with full-surface anti-reflection (AR) coating. The effective focal length of a ball lens is given by the following formula: BFL = F – D/2 and EFL = nD/4(n-1) The Numerical Aperture (NA) of a ball lens is dependent on the focal length of the ball and on the input diameter, d. NA = 2d(n-1)/nD Ball Lens Material Model Price Diameter Number 1.0 mm BK7 LB1-001 $22 2.0 mm BK7 LB1-002 $21 3.0 mm BK7 LB1-003 $20 4.0 mm BK7 LB1-004 $20 5.0 mm BK7 LB1-005 $22 1.0 mm UV FS LB2-001 $34 2.0 mm UV FS LB2-002 $28 3.0 mm UV FS LB2-003 $28 4.0 mm UV FS LB2-004 $28 5.0 mm UV FS LB2-005 $30 6.0 mm UV FS LB2-006 $41 8.0 mm UV FS LB2-008 $43 10.0 mm UV FS LB2-010 $58 Pricing and ordering info Drum Lenses Model No. Diameter Length Price LD1-020-025 2.0 mm 2.5 mm $30 LD1-020-030 2.0 mm 3.0 mm $30 LD1-020-040 3.0 mm 4.0 mm $31 LD1-020-050 4.0 mm 5.0 mm $31 Specifications Material: BK7 grade A optical glass Diameter tolerance: +0.0/-0.05 mm Length: ±0.01 mm Surface quality: 40-20 Scratch-Dig Coating: none A drum lens is a variation of a ball lens where a portion of the ball is ground down to a smaller diameter. These lenses are used in similar applications to those of ball lenses. The drum lens adds the ability to handle and package it in a different way. Pricing and ordering info LD2-XXX-yyy is Fused Silica drum lenses. Contact factory for pricing. D d EFL BFL