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BK7

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
竹(nm)
RC(S)
Grade
竹(nm)
而5(mm)
而10(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 (⊥)
565
1060
0.998
0.996
nF
480.0
1.52282
Ts (⊥)
630
1000
0.999
0.997
ng
435.8
1.52667
T1014.5 (⊥)
511
950
0.999
0.997
nh
404.7
1.53022
T1013 (⊥)
547
900
0.999
0.998
ni
365.0
1.53622
汐20/120而(10-7/k)
75
850
0.999
0.998
汐20/120而(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℅10-3
FA
1.00
550
0.999
0.999
A2
1.1609706℅10-2
E (107Pa)
7920
500
0.999
0.998
A3
-7.6123911℅10-5
G (107Pa)
3270
480
0.999
0.998
A4
2.8558727℅105
0.211
460
0.999
0.998
A5
-1.2566486℅10-6
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
Pd,c
0.2569
B (10-12/Pa)
2.70
370
0.997
0.993
Pe,d
0.2387
Pe,d
0.2371
Coloration Code
360
0.994
0.988
Pg,F
0.5342
Pg,F
0.4748
竹80/竹5
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
老 (g/cm3)
2.52
290
0.36
0.13
→Pg,F
-0.0035
280
0.14
0.02

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