Catalogue Handbook of Standard & Custom Optical Components
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OPTICAL MATERIALS
INDICES OF REFRACTION
Wavelength, nm
Fused Quartz Fused Silica
BK7
Sapphire
213.86
1.53427
-
-
230.21
1.52005
-
-
239.94
1.51337
-
-
265.20
1.50000
-
1.83360
280.35
1.49403
-
1.82427
302.15
1.48719
-
1.81351
334.15
1.47976
-
1.80184
346.62
1.47746
-
1.79815
365.02
1.47452
1.53626
1.79358
404.66
1.46962
1.53024
1.78582
435.84
1.46669
1.52669
1.78120
546.07
1.46008
1.51872
1.77078
706.52
1.45516
1.51289
1.76303
852.11
1.45247
1.50981
1.75885
1013.98
1.45025
1.50731
1.75547
1529.52
1.44427
1.50094
1.74660
1970.09
1.43853
1.49500
1.73833
2325.42
1.43293
1.48929
1.73055
3243.90
1.41315
-
1.70437
3507.00
1.40566
-
1.69504
4954.00
-
-
1.62665
5577.00
-
-
1.58638
100 90 80 70 60 50 40 30 20
10
Optimum Transmission Range:
• 350 nm-2.0 [im
Ideal Applications:
• Optical imaging in the visible spectrum
• Stable temperature environments
NOTE: Esco can work with any commercially available glass type. If there is a specific glass that is more highly suited to your particular application, please contact Esco at 1 -800-922-ESCO (3726) to discuss the design details.
For all standard optical glass components, or when optical glass is generically requested for custom elements, Esco Products uses normal quality BK7, a high quality optical glass that is used whenever the addi­tional benefits of fused silica are not required. Since BK7 performs well in all chemical tests, no spe­cial handling is required, thus reducing manufacturing costs. It is a relatively hard material with extremely low bubble and inclu­sion content. BK7 provides excellent transmittance through­out the visible and near infrared spectra and down to 350 nm in the ultraviolet.
c g
x x
E
x
c
to
-
0
200
700 1000 Wavelength (nm)
3000
300 400
2000
TOLL FREE 1-800-922-ESCO (3726) • 973-697-3700 • FAX 973-697-3011 171 Oak Ridge Road • Oak Ridge, NJ 07438 • USA www.escoproducts.com email: sales@escoproducts.com
ESCO Products Inc.
6
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