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GLASS BK7 BICONCAVE LENSES
Spherical biconcave lenses of BK7 are mostly used for monochromatic lights, such as laser beams or Fraunhofer lines. It has negative focal lengths and are used when parallel beams are diverged.
The lenses are polished carefully by selecting materials (striae, bubbles, inclusions, and homogeneity) and paying attention to dispersion (digs, scratches, and glosses) to prevent troubles with coherent light.
Uncoated and coated with broadband multilayer AR coatings for visible are available.
Standard Specifications:
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Optical Material:
Diameter Tolerance:
Design Wavelength:
Design Index:
Paraxial Focal Length:
Centration:
Clear Aperture:
Surface Quality:
Surface Figure:
Bevel:
Coating: |
BK7 Grade A Optical Glass
+0.0, -0.1mm
546.1nm
1.5183±0.0005
±2%
3 arc minutes
>85%
60-40 scratch and dig
lambda/2
<0.25mm X 45°
available upon request |
Standard Glass BK7 Biconcave Lenses
Dia(mm) |
f(mm) |
R1=R2(mm) |
te(mm) |
tc(mm) |
fb(mm) |
Product Number |
10.0 |
-10.0 |
9.45 |
4.9 |
2.0 |
-8.2 |
UQT-BICAB1010 |
12.7 |
-15.0 |
14.66 |
4.9 |
2.0 |
-13.3 |
UQT-BICAB1011 |
12.7 |
-20.0 |
20.01 |
4.0 |
2.0 |
-18.6 |
UQT-BICAB1012 |
12.7 |
-25.0 |
25.28 |
3.6 |
2.0 |
-23.8 |
UQT-BICAB1013 |
12.7 |
-30.0 |
30.52 |
3.3 |
2.0 |
-28.9 |
UQT-BICAB1014 |
12.7 |
-40.0 |
40.95 |
3.0 |
2.0 |
-39.0 |
UQT-BICAB1015 |
12.7 |
-50.0 |
51.35 |
2.8 |
2.0 |
-49.1 |
UQT-BICAB1016 |
12.7 |
-75.0 |
77.30 |
2.6 |
2.0 |
-74.1 |
UQT-BICAB1017 |
12.7 |
-100.0 |
103.25 |
2.4 |
2.0 |
-99.2 |
UQT-BICAB1018 |
20.0 |
-25.4 |
25.265 |
6.1 |
2.0 |
-23.3 |
UQT-BICAB1019 |
20.0 |
-22.0 |
21.577 |
6.9 |
2.0 |
-19.6 |
UQT-BICAB1020 |
21.0 |
-20.0 |
19.239 |
8.2 |
2.0 |
-17.1 |
UQT-BICAB1021 |
22.4 |
-40.0 |
40.57 |
5.1 |
1.9 |
-38.3 |
UQT-BICAB1022 |
25.0 |
-125.0 |
129.132 |
3.2 |
2.0 |
-123.9 |
UQT-BICAB1023 |
25.4 |
-31.7 |
31.56 |
7.3 |
2.0 |
-29.2 |
UQT-BICAB1024 |
25.4 |
-35.0 |
35.09 |
6.8 |
2.0 |
-32.7 |
UQT-BICAB1025 |
25.4 |
-50.0 |
50.92 |
5.2 |
2.0 |
-48.3 |
UQT-BICAB1026 |
25.4 |
-75.0 |
77.04 |
4.1 |
2.0 |
-73.6 |
UQT-BICAB1027 |
25.4 |
-100.0 |
103.05 |
3.6 |
2.0 |
-98.8 |
UQT-BICAB1028 |
25.4 |
-125.0 |
129.02 |
3.3 |
2.0 |
-123.9 |
UQT-BICAB1029 |
25.4 |
-150.0 |
154.97 |
3.0 |
2.0 |
-149.0 |
UQT-BICAB1030 |
25.4 |
-175.0 |
180.91 |
2.9 |
2.0 |
-174.0 |
UQT-BICAB1031 |
25.4 |
-200.0 |
206.84 |
2.8 |
2.0 |
-199.0 |
UQT-BICAB1032 |
25.4 |
-250.0 |
258.70 |
2.6 |
2.0 |
-249.1 |
UQT-BICAB1033 |
25.4 |
-300.0 |
310.55 |
2.5 |
2.0 |
-299.2 |
UQT-BICAB1034 |
25.4 |
-500.0 |
517.91 |
2.3 |
2.0 |
-499.2 |
UQT-BICAB1035 |
25.4 |
-1000.0 |
1036.23 |
2.2 |
2.0 |
-999.3 |
UQT-BICAB1036 |
25.4 |
-25.4 |
24.712 |
9.0 |
2.0 |
-22.2 |
UQT-BICAB1037 |
30.0 |
-50.0 |
50.731 |
6.5 |
2.0 |
-47.8 |
UQT-BICAB1038 |
30.0 |
-500.0 |
518.306 |
2.4 |
2.0 |
-499.2 |
UQT-BICAB1039 |
35.0 |
-110.0 |
113.31 |
4.7 |
2.0 |
-108.4 |
UQT-BICAB1040 |
38.0 |
-50.0 |
49.97 |
10.5 |
3.0 |
-46.4 |
UQT-BICAB1041 |
38.0 |
-100.0 |
102.52 |
6.5 |
3.0 |
-97.8 |
UQT-BICAB1042 |
38.0 |
-150.0 |
154.57 |
5.4 |
3.0 |
-148.2 |
UQT-BICAB1043 |
38.0 |
-200.0 |
206.51 |
4.8 |
3.0 |
-198.4 |
UQT-BICAB1044 |
38.0 |
-350.0 |
362.13 |
4.0 |
3.0 |
-348.7 |
UQT-BICAB1045 |
38.0 |
-500.0 |
517.67 |
3.7 |
3.0 |
-498.8 |
UQT-BICAB1046 |
38.0 |
-700.0 |
725.02 |
3.5 |
3.0 |
-698.8 |
UQT-BICAB1047 |
38.0 |
-45.0 |
44.836 |
10.4 |
2.0 |
-41.4 |
UQT-BICAB1048 |
38.1 |
-50.8 |
51.063 |
9.3 |
1.9 |
-47.6 |
UQT-BICAB1049 |
40.0 |
-63.5 |
64.38 |
8.3 |
1.9 |
-60.7 |
UQT-BICAB1050 |
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| Please Contact ultiQuest for other dimensions in prototype and production quantities. |
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| NOTES! |
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Focal lengths of these lenses change as the shifts of refractive indexes of the material according to wavelength. (In the short wavelength range, the refractive index is higher and the focal length is shorter. In the long wavelength range, the refractive index is lower and the focal length is longer.) |
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The edge thicknesses fare theoretical values not including chamfer. |
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Be sure to wear laser safety goggles when checking optical path and adjusting optical axis. |
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