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Features
The Double Concave Lenses are made from BK7 material, which are manufactured with both surfaces concave. These lenses have negative focal lengths. These lenses diverge collimated incident light and form virtual images, which are seen through the lens. They are often used to expand light or increase focal lengths in existing systems. They are used in laser beam expanders, optical character readers, viewers, and projection systems. We will provide precision grade Double Concave Lenses with tighter manufacturing tolerances.
Specifications
 Specifications:
Material: BK7
Design Wavelength: 546.1nm, n=1.518721
Diameter Tolerance: +0.0/-0.1mm
Paraxial Focal Length: ±2%
Centration: 3 arc minutes
Surface Figure : l/4 @ 632.8 nm
Surface Quality: 60/40
Clear Aperture: >80%
Bevel: <0.25mm X 45°
Coating: Uncoated


 
Item# φ(mm) f(mm) R2=R2(mm) Tc Te Fb
BCV1-001 6.0 -15.0 15.20 2.10 1.5 14.30
BCV1-002 6.0 -30.0 30.83 1.79 1.5 29.42
BCV1-101 12.7 -15.0 14.65 4.89 2.0 13.27
BCV1-102 12.7 -20.0 20.04 4.07 2.0 18.62
BCV1-103 12.7 -25.0 25.35 3.62 2.0 23.82
BCV1-104 12.7 -30.0 30.55 3.33 2.0 28.89
BCV1-105 12.7 -40.0 41.02 2.99 2.0 39.04
BCV1-106 12.7 -50.0 51.40 2.79 2.0 49.08
BCV1-107 12.7 -75.0 77.45 2.52 2.0 74.24
BCV1-108 12.7 -100.0 103.28 2.39 2.0 99.16
BCV1-201 25.4 -25.0 24.72 9.02 2.0 22.24
BCV1-202 25.4 -31.7 31.55 7.34 2.0 29.15
BCV1-203 25.4 -35.0 35.08 6.76 2.0 32.66
BCV1-204 25.4 -50.0 50.93 5.22 2.0 48.22
BCV1-205 25.4 -75.0 77.09 4.11 2.0 73.63
BCV1-206 25.4 -100.0 103.04 3.57 2.0 98.73
BCV1-207 25.4 -125.0 129.12 3.25 2.0 123.92
BCV1-208 25.4 -150.0 155.10 3.04 2.0 149.00
BCV1-209 25.4 -175.0 181.13 2.89 2.0 174.12
BCV1-210 25.4 -200.0 207.00 2.78 2.0 199.07
BCV1-211 25.4 -250.0 258.90 2.62 2.0 249.12
BCV1-212 25.4 -300.0 310.80 2.52 2.0 299.17
BCV1-213 25.4 -500.0 518.30 2.31 2.0 499.21
BCV1-214 25.4 -1000.0 1037.10 2.16 2.0 999.32
BCV1-301 38.0 -45.0 44.87 10.44 2.0 41.46
BCV1-302 38.0 -50.0 49.97 10.50 3.0 46.40
BCV1-303 38.0 -100.0 102.57 6.55 3.0 97.78
BCV1-304 38.0 -150.0 154.70 5.34 3.0 148.23
BCV1-305 38.0 -200.0 206.70 4.75 3.0 198.46
BCV1-306 38.0 -350.0 362.40 4.00 3.0 348.66
BCV1-307 38.0 -500.0 518.10 3.70 3.0 498.79
BCV1-308 38.0 -700.0 725.60 3.50 3.0 698.84
BCV1-309 40.0 -63.5 64.42 8.27 1.9 60.70
BCV1-501 50.0 -100.0 102.06 9.20 3.0 96.90
BCV1-502 50.0 -150.0 154.27 7.10 3.0 147.60
BCV1-503 50.0 -200.0 206.28 6.00 3.0 198.00
BCV1-504 50.0 -250.0 258.22 5.40 3.0 248.20
BCV1-505 50.0 -400.0 413.87 4.50 3.0 398.50
BCV1-506 50.0 -450.0 465.73 4.30 3.0 448.60
BCV1-507 50.0 -500.0 517.58 4.20 3.0 448.60
BCV1-508 50.0 -600.0 621.28 4.00 3.0 598.70
BCV1-509 50.0 -800.0 828.64 3.8 3.0 798.70