N-BK7 Data Sheet
Sydor Optics offers Optical Wedges, Optical Filters, and Witness Samples made from the SCHOTT N-BK7 borosilicate crown glass material. If you have questions or need help selecting the ideal material for your application, please contact a Sales Engineer, who will gladly assist you with your needs or discuss additional options that may be available.
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N-BK7
nd= 1.51680 |
νd= 64.17 |
nF-nC= 0.008054 |
ne= 1.51872 |
νe= 63.96 |
nF’-nC’= 0.008110 |
|
Refractive Indices |
|
λ [nm] |
|
n2325.4 |
2325.4 |
1.48921 |
n1970.1 |
1970.1 |
1.49495 |
n1529.6 |
1529.6 |
1.50091 |
n1060.0 |
1060.0 |
1.50669 |
nt |
1014.0 |
1.50731 |
ns |
852.1 |
1.50980 |
nr |
706.5 |
1.51289 |
nC |
656.3 |
1.51432 |
nC’ |
643.8 |
1.51472 |
n632.8
| 632.8 |
1.51509 |
nD
| 589.3 |
1.51673 |
nd
| 587.6 |
1.51680 |
ne
| 546.1 |
1.51872 |
nF
| 486.1 |
1.52238 |
nF’
| 480.0 |
1.52283 |
ng
| 435.8 |
1.52668 |
nh
| 404.7 |
1.53024 |
ni
| 365.0 |
1.53627 |
n334.1
| 334.1 |
1.54272 |
n312.6
| 312.6 |
1.54862 |
n296.7
| 296.7 |
|
n280.4
| 280.4 |
|
n248.3
| 248.3 |
|
|
Constants of Dispersion Formula |
B1 |
1.03961212 |
B2 |
0.231792344 |
B3 |
1.01046945 |
C1 |
0.00600069867 |
C2 |
0.0200179144 |
C3 |
103.560653 |
|
Constants of Dispersion dn/dT |
D0 |
1.86 . 10-6 |
D1 |
1.31 . 10-8 |
D2 |
-1.37 . 10-11 |
E0 |
4.34 . 10-7 |
E1 |
6.27 . 10-10 |
λTK[μm] |
6.27 . 10-10 |
|
|
Internal Transmittance τi |
λ [nm] |
τi(10mm) |
τi(25mm) |
2500 |
0.665 |
0.360 |
2325 |
0.793 |
0.560 |
1970 |
0.933 |
0.840 |
1530 |
0.992 |
0.980 |
1060 |
0.999 |
0.997 |
700 |
0.998 |
0.996 |
660 |
0.998 |
0.994 |
620 |
0.998 |
0.994 |
580 |
0.998 |
0.995 |
546 |
0.998 |
0.996 |
500 |
0.998 |
0.994 |
460 |
0.997 |
0.993 |
436 |
0.997 |
0.992 |
420 |
0.997 |
0.993 |
405 |
0.997 |
0.993 |
400 |
0.997 |
0.992 |
390 |
0.996 |
0.989 |
380 |
0.993 |
0.983 |
370 |
0.991 |
0.977 |
365 |
0.988 |
0.971 |
350 |
0.967 |
0.920 |
334 |
0.905 |
0.780 |
320 |
0.770 |
0.520 |
310 |
0.574 |
0.250 |
300 |
0.292 |
0.050 |
290 |
0.063 |
|
280 |
|
|
270 |
|
|
260 |
|
|
250 |
|
|
|
|
Color Code |
λ 80/λ5 |
33/29 |
(*= λ70 /λ5) |
Remarks |
step 0.5 available |
|
|
|
|
Relative Partial Dispersion |
Ps,t |
0.3098 |
P C,s |
0.5612 |
Pd,C |
0.3076 |
Pe,d |
0.2386 |
Pg,F |
0.5349 |
Pi,h |
0.7483 |
|
|
P’ s,t
| 0.3076 |
P’ C’,s
| 0.6062 |
P’ d,C’
| 0.2566 |
P’ e,d
| 0.2370 |
P’ g,F’
| 0.4754 |
P’ i,h
| 0.7432 |
Deviation of Relative Partial Dispersions ΔP from the “Normal Line” |
ΔP C,t |
0.0216 |
ΔP C,s |
0.0087 |
ΔPF,e |
-0.0009 |
ΔPg,F |
-0.0009 |
ΔPi,g |
0.0035 |
Other Properties |
α-30/+70°C [10-6/K] |
7.1 |
α+20/+300°C [10-6/K] |
8.3 |
Tg[°C] |
557 |
T10 13.0[°C] |
557 |
T10 7.6[°C] |
719 |
cp[J/(g·K)] |
0.858 |
λ [W/(m·K)] |
1.114 |
|
|
ρ [g/cm3] |
2.51 |
E[103N/mm2] |
82 |
μ |
0.206 |
K[10-6mm2/N] |
2.77 |
HK0.1/20 |
610 |
HG |
3 |
|
|
CR |
1 |
FR |
0 |
SR |
1 |
AR |
2.3 |
PR |
2.3 |
|
|
Temperature Coefficients of Refractive Index |
|
Δnrel/ΔT[10-6/K] |
Δnabs/ΔT[10-6/K] |
[°C] |
1060.0 |
e |
g |
1060.0 |
e |
g |
-40/ -20 |
2.4 |
2.9 |
3.3 |
0.3 |
0.8 |
1.2 |
+20/ +40 |
2.4 |
3.0 |
3.5 |
1.1 |
1.6 |
2.1 |
+60/ +80 |
2.5 |
3.1 |
3.7 |
1.5 |
2.1 |
2.7 |
|