Double Concave Lenses are characterized by identical concave surfaces on both sides, giving them a negative focal length. These lenses inherently diverge incoming light rays. In 1:1 imaging, they ensure faithful image reproduction without distortion. Within multielement systems, they partner with other lenses to rectify aberrations and fine - tune focal lengths, optimizing overall optical performance. Their light - diverging property makes them essential in optical setups demanding precise light - path control, enhancing functionality in diverse applications.
Specifications:
| Material: | N-BK7, Fused Silica, N-SF10, Silicon, Ge,CaF2, etc. |
| Diameter Tolerance: | +0.0/-0.15mm |
| Focal Length Tolerance (mm): | ±2% |
| Centration: | <3 arc minutes |
| Clear Aperture: | >85% |
| Surface Figure: | <λ/4@633nm |
| Surface Quality: | 60/40 |
| Protected Bevel: | <0.25mmx45deg |
| Coating: | uncoated, AR, HR, PR Coating, etc. |
N-BK7 Double Concave Lens
Design wavelength: 546.1nm Design Index:1.5183 ± 0.0005
|
Part No.
|
f (mm)
|
dia (mm)
|
R1=R2 (mm)
|
t c (mm)
|
t e (mm)
|
Fb (mm)
|
|
DCV1201
|
-25.0
|
12.7
|
26.25
|
2.0
|
3.6
|
-25.7
|
|
DCV1202
|
-30.0
|
12.7
|
31.44
|
2.0
|
3.3
|
-30.7
|
|
DCV1203
|
-40.0
|
12.7
|
41.80
|
2.0
|
3.0
|
-40.7
|
|
DCV1204
|
-50.0
|
12.7
|
52.17
|
2.0
|
2.8
|
-50.7
|
|
DCV1301
|
-25.0
|
25.0
|
26.25
|
2.0
|
8.6
|
-25.7
|
|
DCV1302
|
-35.0
|
25.4
|
36.62
|
2.0
|
6.5
|
-35.7
|
|
DCV1303
|
-50.0
|
25.4
|
52.17
|
2.0
|
5.1
|
-50.7
|
|
DCV1305
|
-75.0
|
25.4
|
78.09
|
2.0
|
4.1
|
-75.7
|
|
DCV1306
|
-100.0
|
25.4
|
104.00
|
2.0
|
3.6
|
-100.7
|
Fused silica Double Concave Lens
Design wavelength: 546.1nm Design Index:1.46008
|
Part No.
|
F (mm)
|
f(mm)
|
R1=R2(mm)
|
Tc
|
Te
|
Fb
|
||||||||||
|
BCV2001
|
6.0
|
15.0
|
14.03
|
1.5
|
2.15
|
15.50
|
||||||||||
|
BCV2002
|
6.0
|
30.0
|
27.84
|
1.5
|
1.82
|
30.51
|
||||||||||
|
BCV2101
|
12.7
|
15.0
|
14.11
|
2.0
|
5.02
|
15.67
|
||||||||||
|
BCV2102
|
12.7
|
20.0
|
18.71
|
2.0
|
4.22
|
20.67
|
||||||||||
|
BCV2103
|
12.7
|
25.0
|
23.32
|
2.0
|
3.76
|
25.68
|
||||||||||
|
BCV2104
|
12.7
|
30.0
|
27.92
|
2.0
|
3.46
|
30.68
|
||||||||||
|
BCV2105
|
12.7
|
40.0
|
37.12
|
2.0
|
3.09
|
40.68
|
||||||||||
|
BCV2201
|
25.4
|
25.0
|
23.32
|
2.0
|
9.52
|
25.68
|
||||||||||
|
BCV2202
|
35.4
|
35.0
|
32.52
|
2.0
|
7.17
|
35.68
|
||||||||||
|
BCV2203
|
25.4
|
50.0
|
46.32
|
2.0
|
5.55
|
50.68
|
||||||||||
|
BCV2204
|
25.4
|
75.0
|
69.33
|
2.0
|
4.35
|
75.69
|
||||||||||
|
BCV2205
|
25.4
|
100.0
|
92.33
|
2.0
|
3.76
|
100.68
|
||||||||||
|
BCV2206
|
25.4
|
150.0
|
138.34
|
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