Double Concave Lens

A double concave lens/double concave mirror has a negative focal length, thereby causing collimated incident light to diverge. The double concave lens/mirror has an equal radius of curvature on both sides of the lens. They are generally used to expand light or increase focal length in the existing system, such as beam expander and projection systems.

Description Of Double Concave Lens/Mirror
The double concave lens of Ecoptik has a negative focal length, thereby causing collimated incident light to diverge. A double concave lens has an equal radius of curvature on both sides of the lens.

Specifications Of Double Concave Lens/Mirror
Material Optical glass/ Fused silica/ sapphire etc.
Diameter 2mm~300mm
Diameter   tolerance ¯0.05mm(≤50mm)
¯0.1mm(＞50mm)
Focal   length -50mm~-2000mm
Focal   length tolerance ¯0.2%（＜10mm）
¯0.5%（＜10mm-1000mm）
¯1%（＜＞1000mm）
Center   Thickness 2mm~20mm
Surface   quality 60/40， 40/20，   20/10
Surface   accuracy λ/2~λ/[email protected]，532nm
Clear   Aperture >85% dig diameter
Centration <3arc min~ 30arc sec
Coating As per customer’s request

Material Diameter
   (mm) Surface Radius   1
   (mm) Surface Radius   2
   (mm) Center   Thickness
   (mm) Focal   Length
   (mm)
H-ZK3 5 -14.4 -14.4 3 -9.8
H-ZF6 8 -7.2 -30.5 5 -7.4
H-K9L 10 -11.1 -11.1 2 -10.4
JGS1 10 -9.25 -9.25 1.25 -9.8
H-ZF7LA 11 -11.9 -11.9 2 -7.1
H-K9L 12 -25.1 -25.1 1.26 -24
BAF3 12 -19.5 -47.1 2 -23.4
ZF11 12 -12.6 -12.6 3 -7.4
H-K9L 12.5 -103 -103 1.5 -98.9
H-ZF6 13 -30.6 -154 3 -33.5
H-LAK7 13 -48.9 -27.7 2 -24.4
H-ZK2 13 -12.1 -15.7 1 -11.3
H-ZF6 13.5 -34.7 -79.6 1.5 -31.6
H-ZF2 14 -36.2 -192 3 -45
H-ZF6 14 -34.7 -79.6 3 -31.6
H-LAK53A 14 -31.7 -58.8 1.5 -27
H-K9L 14 -27.9 -32.2 2 -19
H-ZF6 15 -23 -27.7 2.8 -16.4
H-ZF6 15 -27.5 -23.6 7.23 -16.4
H-F3 15 -50.5 -11.3 1.5 -14.8
N-SF6 15 -13.2 -12.1 2 -7.4
H-ZF3 16 -30.6 -15.8 3 -14.6
H-LAF50B 16.7 -16.8 -17.8 1.8 -11
H-LAF50B 17.3 -37.2 -37.2 3 -23.9
H-K9L 20 -299 -85.4 2 -128
H-ZF52A 20 -51.6 -21 1.9 -16.7
H-ZF6 21 -77.4 -77.4 2.5 -51
H-ZF7LA 21 -42.6 -184 4.064 -42.8
H-ZF7LA 22 -255 -16.2 9 -18.7
H-K9L 24 -11.1 -90 1 -18.9
JGS1 25 -92.1 -92.1 2.5 -100
H-K9L 25 -52.1 -52.1 3.5 -50
H-LAF4 25 -38.4 -38.4 8.4 -25.4
H-F4 25 -36.7 -29.2 3 -25
ZK9 27 -149 -52.9 1.45 -62.7
H-ZK21 28.6 -281 -23.8 3 -35
BaK2 29.5 -2249 -80.2 2 -143
JGS1 30 -71 -71 3 -77
BaK2 30.5 -2249 -76.4 2 -137
H-ZF3 32 -11.8 -284 2 -15.7
ZF1 41 -692 -170 2.8 -211
ZF7L 44 -153 -49 3 -45.8
ZF4 54 -340 -249 2.5 -197
H-ZF3 58 -73.8 -234 4 -77.8
F4 60 -74.9 -78.4 1 -61.3
ZF1 65 -516 -163 5.49 -190
ZBaF3 65 -296 -52.4 2.5 -67.5
H-ZF2 68 -83.5 -249 5.5 -92.3
F13 68 -2465 -41.8 3 -65.6
H-F4 72 -170 -71.8 12 -80
H-K9L 90 -102 -347 6 -15
2

Ecoptik is a professional optical components companies, we provide custom optical components, dome flange and etc. Want to know more? Please contact us.