Bi-Concave Lenses
Material:
N-BK7, UV grade fused silica, CaF₂ etc
Surface Flatness:
N＜3, △N＜λ/4
Coating:
Uncoated,
Single Layer MgF₂,
AR/AR@250-400nm, Ravg<0.5%,
AR/AR@400-700nm, Ravg<0.5%,
AR/AR@650-1050nm, Ravg<0.5%,
AR/AR@1000-1650nm, Ravg<0.5%
Surface Quality:
60/40~10/5
Clear Aperture:
>90%
| wdt_ID | Attributes | Value |
|---|---|---|
| 1 | Material | N-BK7 UV grade fused silica CaF₂ etc |
| 17 | Diameter Tolerance | +0.0,-0.1mm |
| 18 | Center Thickness | +/-0.2mm |
| 19 | Surface Quality | 60/40~10/5 |
| 20 | Paraxial Focal Length | +/-1% (EFL＜1m) +/-2%（EFL＞1m) |
| 21 | Surface Flatness | N＜3, △N＜λ/4 |
| 25 | Clear Aperture | >90% |
| 26 | Coating | Uncoated, Single Layer MgF₂ AR/AR@250-400nm, Ravg＜0.5% AR/AR@400-700nm, Ravg＜0.5% AR/AR@650-1050nm, Ravg＜0.5% AR/AR@1000-1650nm, Ravg＜0.5% |
Bi-concave lenses have a negative focal length and are best used to diverge a converging beam. Bi-concave lenses can diverge a collimated beam to a virtual focus and are commonly used in Galilean-type beam expanders.
wdt_ID Part No. Material f (mm) dia (mm) R1=R2 (mm) t c (mm) t e (mm)
241
BVL10610
N-BK7
-10
6
-10.5
2
2.9
242
BVL11015
N-BK7
-15
10
-15.95
2
2.8
243
BVL11030
N-BK7
-30
10
-31.35
2.5
4.1
244
BVL112719
N-BK7
-19
12.7
-19.97
2
4.2
245
BVL112725
N-BK7
-25
12.7
-26.17
2.5
4.1
308
BVL112730
N-BK7
-30
12.7
-31.41
3
4.3
309
BVL112750
N-BK7
-50
12.7
-52.1
3.5
4.3
310
BVL12030
N-BK7
-30
20
-31.48
2.7
6
311
BVL12040
N-BK7
-40
20
-41.83
2.7
5.1
312
BVL125450
N-BK7
-50
25.4
-52.01
3
6.1
313
BVL125475
N-BK7
-75
25.4
-77.86
3.5
5.6
314
BVL1254100
N-BK7
-100
25.4
-103.69
4
5.6
315
BVL1254150
N-BK7
-150
25.4
-156.12
3
4.1
316
BVL13060
N-BK7
-60
30
-62.66
3.5
7.1
317
BVL130180
N-BK7
-180
30
-186.64
3.5
4.7
318
BVL130250
N-BK7
-250
30
-258.99
3.5
4.4
319
BVL140100
N-BK7
-100
40
-104.05
4
7.9
320
BVL140150
N-BK7
-150
40
-155.72
4
6.6
321
BVL1508250
N-BK7
-250
50.8
-259.25
5
7.5
322
BVL1508400
N-BK7
-400
50.8
-414.87
5
6.6
323
BVL1508500
N-BK7
-500
50.8
-517.65
5
6.3
324
BVL3063063
UV Fused Silica
-6.3
6.3
-6.08
2
3.76
325
BVL31010
UV Fused Silica
-10
10
-9.48
2
4.85
326
BVL3127127
UV Fused Silica
-12.7
12.7
-11.95
2
5.65
327
BVL312715
UV Fused Silica
-15
12.7
-14.12
2
5.42
| wdt_ID | Part No. | Material | f (mm) | dia (mm) | R1=R2 (mm) | t c (mm) | t e (mm) |
|---|---|---|---|---|---|---|---|
| 241 | BVL10610 | N-BK7 | -10 | 6 | -10.5 | 2 | 2.9 |
| 242 | BVL11015 | N-BK7 | -15 | 10 | -15.95 | 2 | 2.8 |
| 243 | BVL11030 | N-BK7 | -30 | 10 | -31.35 | 2.5 | 4.1 |
| 244 | BVL112719 | N-BK7 | -19 | 12.7 | -19.97 | 2 | 4.2 |
| 245 | BVL112725 | N-BK7 | -25 | 12.7 | -26.17 | 2.5 | 4.1 |
| 308 | BVL112730 | N-BK7 | -30 | 12.7 | -31.41 | 3 | 4.3 |
| 309 | BVL112750 | N-BK7 | -50 | 12.7 | -52.1 | 3.5 | 4.3 |
| 310 | BVL12030 | N-BK7 | -30 | 20 | -31.48 | 2.7 | 6 |
| 311 | BVL12040 | N-BK7 | -40 | 20 | -41.83 | 2.7 | 5.1 |
| 312 | BVL125450 | N-BK7 | -50 | 25.4 | -52.01 | 3 | 6.1 |
| 313 | BVL125475 | N-BK7 | -75 | 25.4 | -77.86 | 3.5 | 5.6 |
| 314 | BVL1254100 | N-BK7 | -100 | 25.4 | -103.69 | 4 | 5.6 |
| 315 | BVL1254150 | N-BK7 | -150 | 25.4 | -156.12 | 3 | 4.1 |
| 316 | BVL13060 | N-BK7 | -60 | 30 | -62.66 | 3.5 | 7.1 |
| 317 | BVL130180 | N-BK7 | -180 | 30 | -186.64 | 3.5 | 4.7 |
| 318 | BVL130250 | N-BK7 | -250 | 30 | -258.99 | 3.5 | 4.4 |
| 319 | BVL140100 | N-BK7 | -100 | 40 | -104.05 | 4 | 7.9 |
| 320 | BVL140150 | N-BK7 | -150 | 40 | -155.72 | 4 | 6.6 |
| 321 | BVL1508250 | N-BK7 | -250 | 50.8 | -259.25 | 5 | 7.5 |
| 322 | BVL1508400 | N-BK7 | -400 | 50.8 | -414.87 | 5 | 6.6 |
| 323 | BVL1508500 | N-BK7 | -500 | 50.8 | -517.65 | 5 | 6.3 |
| 324 | BVL3063063 | UV Fused Silica | -6.3 | 6.3 | -6.08 | 2 | 3.76 |
| 325 | BVL31010 | UV Fused Silica | -10 | 10 | -9.48 | 2 | 4.85 |
| 326 | BVL3127127 | UV Fused Silica | -12.7 | 12.7 | -11.95 | 2 | 5.65 |
| 327 | BVL312715 | UV Fused Silica | -15 | 12.7 | -14.12 | 2 | 5.42 |
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