| OHARA | L-LAH83 |
864406 869403 |
||||||
| Refractive Index |  |
1.86400 | Abbe Number |  |
40.6 | Dispersion |  |
0.02129 |
| 1.864000 | 40.58 | 0.021293 | ||||||
 |
1.869060 |  |
40.33 |  |
0.021547 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.81761 |
 |
1.97009 | 1.82429 |
 |
1.52958 | 1.83178 |
 |
1.12864 | 1.83919 |
 |
1.01398 | 1.84192 |
 |
0.85211 | 1.84702 |
 |
0.76819 | 1.85069 |
 |
0.70652 | 1.85415 |
 |
0.65627 | 1.85767 |
 |
0.64385 | 1.85867 |
 |
0.6328 | 1.85960 |
 |
0.58929 | 1.86381 |
 |
0.58756 | 1.86400 |
 |
0.54607 | 1.86906 |
 |
0.48613 | 1.87896 |
 |
0.47999 | 1.88021 |
 |
0.44157 | 1.88942 |
 |
0.435835 | 1.89104 |
 |
0.404656 | 1.90129 |
 |
0.365015 | 1.91926 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
574 |
| Annealing Point (°C) |
AP |
595 |
| Transformation Temperature (°C) |
Tg |
608 |
| Yield Point (°C) |
At |
658 |
| Softening Point (°C) |
SP |
713 |
| Expansion Coefficient   |
-30~+70°C |
68 |
+100~+300°C |
80 |
|
Thermal Conductivity |
k |
0.894 |
Mechanical Properties |
||
Young's Modulus |
E |
1271 |
| Rigidity Modulus |
G |
489 |
| Poisson's Ratio |  |
0.299 |
| Knoop Hardness | Hk |
680 [7] |
| Abrasion | Aa |
64 |
Photoelastic Constant |
 |
1.61 |
Partial Dispersions |
|
 |
0.015753 |
 |
0.006983 |
 |
0.006328 |
 |
0.011389 |
 |
0.027035 |
 |
0.012070 |
 |
0.010252 |
 |
0.028222 |
 |
0.016749 |
 |
0.010393 |
 |
0.011154 |
 |
0.039042 |
Deviation of Relative Partial Dispersions |
|
 |
0.0027 |
 |
0.0029 |
 |
-0.0107 |
 |
-0.0089 |
 |
-0.0598 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.82331579 | |
 |
5.48625885 |  |
 |
1.63182855 | |
 |
9.11468875 |  |
 |
3.28419670 |  |
 |
1.23611174 |  |
1129 ~ 2325 nm |
||
|
1.82331579 | |
|
5.48625885 | |
|
1.63182855 | |
|
9.11468875 | |
|
3.28419670 | |
|
1.23611174 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
2 |
| Weathering Resistance (S) | W(S) |
|
| Acid Resistance (S) | SR |
3.2 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
5.29 |
|
| Coloring |  |
37 |
|
 |
31 |
||
Relative Partial Dispersions |
|
 |
0.7398 |
 |
0.3279 |
 |
0.2972 |
 |
0.5349 |
 |
1.2697 |
 |
0.5669 |
 |
0.4815 |
 |
1.3254 |
 |
0.7773 |
 |
0.4823 |
 |
0.5177 |
 |
1.8119 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
0.030 |
|
320 |
0.150 |
|
330 |
0.330 |
|
340 |
0.510 |
|
350 |
0.660 |
|
360 |
0.770 |
|
365 |
||
370 |
0.850 |
|
380 |
0.905 |
|
390 |
0.933 |
|
400 |
0.950 |
|
420 |
0.966 |
|
440 |
0.975 |
|
460 |
0.982 |
|
480 |
0.988 |
|
500 |
0.992 |
|
550 |
0.997 |
|
600 |
0.997 |
|
650 |
0.997 |
|
700 |
0.998 |
|
800 |
0.998 |
|
900 |
0.998 |
|
1000 |
0.998 |
|
1200 |
0.998 |
|
1400 |
0.997 |
|
1600 |
0.996 |
|
1800 |
0.991 |
|
2000 |
0.977 |
|
2200 |
0.946 |
|
2400 |
0.820 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 4.7 |
5.5 |
5.6 |
5.8 |
6.2 |
6.9 |
7.7 |
|
| -20 ~ 0 | 4.7 |
5.6 |
5.6 |
5.9 |
6.3 |
7.1 |
7.9 |
|
| 0 ~ 20 | 4.8 |
5.6 |
5.7 |
6.0 |
6.3 |
7.2 |
8.1 |
|
| 20 ~ 40 | 4.7 |
5.7 |
5.7 |
6.0 |
6.4 |
7.2 |
8.1 |
|
| 40 ~ 60 | 4.8 |
5.8 |
5.8 |
6.1 |
6.5 |
7.4 |
8.3 |
|
| 60 ~ 80 | 4.9 |
5.9 |
6.0 |
6.3 |
6.7 |
7.7 |
8.6 |
|