| BK7, high transmission for visible to near
infrared applications, the most common optical glass.
| Chinese K9 517642 |
nd=1.58610 |
vd=64.20 |
nd-ne=0.008050 |
| ne=1.51872 |
ve=64.00 |
vd-ve=0.008105 |
| Refractive Indices |
Chemical Properties |
Internal Transmittance |
nr |
¦Ë(nm)
|
|
RC(S) |
Grade
|
¦Ë(nm)
|
¦Ó5(mm) |
¦Ó10(mm)
|
706.5 |
1.51289 |
1 |
2400 |
0.86 |
0.74 |
| nc |
656.3 |
1.51432 |
RA(S) |
1 |
2200 |
0.930 |
0.86 |
| nc' |
643.8 |
1.51472 |
Dw |
3 |
2000 |
0.960 |
0.922 |
| nHe-Ne |
632.8 |
1.51509 |
Da |
1 |
1800 |
0.985 |
0.970 |
| nD |
589.3 |
1.51673 |
|
|
1600 |
0.990 |
0.980 |
| nd |
587.6 |
1.51680 |
|
|
1400 |
0.995 |
0.990 |
| ne |
546.1 |
1.51872 |
Thermal Properties
|
1200 |
0.998 |
0.996 |
| nF |
486.1 |
1.52237 |
Tg (¡æ) |
565 |
1060 |
0.998 |
0.996 |
| nF' |
480.0 |
1.52282 |
Ts (¡æ) |
630 |
1000 |
0.999 |
0.997 |
| ng |
435.8 |
1.52667 |
T1014.5 (¡æ) |
511 |
950 |
0.999 |
0.997 |
| nh |
404.7 |
1.53022 |
T1013 (¡æ) |
547 |
900 |
0.999 |
0.998 |
| ni |
365.0 |
1.53622 |
a20/120¦Ó(10-7/k) |
75 |
850 |
0.999 |
0.998 |
| |
|
|
a20/120¦Ó(10-7/k) |
82 |
800 |
0.999 |
0.999 |
| |
|
|
|
|
700 |
0.999 |
0.999 |
| Constants of Dispersion Formala |
Mechanical Properties |
650 |
0.999 |
0.998 |
| A0 |
2.2702566 |
HK
(107Pa) |
595 |
600 |
0.999 |
0.999 |
| A1 |
-9.1988101¡Á10-3 |
FA |
1.00 |
550 |
0.999 |
0.999 |
|
A2 |
1.1609706¡Á10-2 |
E
(107Pa) |
7920 |
500 |
0.999 |
0.998 |
| A3 |
-7.6123911¡Á10-5 |
G
(107Pa) |
3270 |
480 |
0.999 |
0.998 |
| A4 |
2.8558727¡Á105 |
¦Ì |
0.211 |
460 |
0.999 |
0.998 |
| A5 |
-1.2566486¡Á10-6 |
|
|
440 |
0.999 |
0.997 |
|
|
|
420 |
0.999 |
0.998 |
| |
|
|
|
|
|
400 |
0.999 |
0.998 |
Relative
Partial Dispersions
|
Stree-Optical
Coefficient
|
390 |
0.998 |
0.997 |
| Pd,c |
0.3080 |
P'd,c |
0.2569 |
B
(10-12/Pa) |
2.70 |
370 |
0.997 |
0.993 |
| Pe,d |
0.2387 |
P'e,d |
0.2371 |
Coloration
Code
|
360 |
0.994 |
0.988 |
| Pg,F |
0.5342 |
P'g,F |
0.4748 |
¦Ë80/¦Ë5 |
33/29 |
350 |
0.989 |
0.977 |
| |
|
|
|
340 |
0.977 |
0.954 |
| |
|
|
|
330 |
0.95 |
0.91 |
|
Deviation
of Relative ¡÷Partial Dispersions Pfrom the ¡°Normal
Line¡±
|
|
|
320 |
0.90 |
0.81 |
|
|
310 |
0.80 |
0.63 |
|
Other
Properties |
300 |
0.61 |
0.38 |
| ¡÷PF,e |
-0.0014 |
P
(g/cm3) |
2.52 |
290 |
0.36 |
0.13 |
| ¡÷Pg,F |
-0.0035 |
|
|
280 |
0.14 |
0.02 |
| |
|
|
|
|
|
|
|
|
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