| OHARA | S-LAH79 |
2003283 11281 |
||||||
| Refractive Index |  |
2.00330 | Abbe Number |  |
28.3 | Dispersion |  |
0.03549 |
| 2.003300 | 28.27 | 0.035486 | ||||||
 |
2.011689 |  |
28.07 |  |
0.036041 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.93904 |
 |
1.97009 | 1.94642 |
 |
1.52958 | 1.95518 |
 |
1.12864 | 1.96486 |
 |
1.01398 | 1.96873 |
 |
0.85211 | 1.97630 |
 |
0.76819 | 1.98195 |
 |
0.70652 | 1.98739 |
 |
0.65627 | 1.99301 |
 |
0.64385 | 1.99461 |
 |
0.6328 | 1.99613 |
 |
0.58929 | 2.00299 |
 |
0.58756 | 2.00330 |
 |
0.54607 | 2.01169 |
 |
0.48613 | 2.02850 |
 |
0.47999 | 2.03066 |
 |
0.44157 | 2.04682 |
 |
0.435835 | 2.04972 |
 |
0.404656 | 2.06844 |
 |
0.365015 | |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
699 |
| Yield Point (°C) |
At |
731 |
| Softening Point (°C) |
SP |
|
| Expansion Coefficient   |
-30~+70°C |
60 |
+100~+300°C |
71 |
|
Thermal Conductivity |
k |
0.957 |
Mechanical Properties |
||
Young's Modulus |
E |
1255 |
| Rigidity Modulus |
G |
484 |
| Poisson's Ratio |  |
0.297 |
| Knoop Hardness | Hk |
700 [7] |
| Abrasion | Aa |
61 |
Photoelastic Constant |
 |
1.89 |
Partial Dispersions |
|
 |
0.024281 |
 |
0.011059 |
 |
0.010289 |
 |
0.018678 |
 |
0.046416 |
 |
0.021219 |
 |
0.018725 |
 |
|
 |
0.025885 |
 |
0.017074 |
 |
0.018967 |
 |
|
Deviation of Relative Partial Dispersions |
|
 |
0.0049 |
 |
0.0015 |
 |
0.0020 |
 |
0.0023 |
 |
|
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
2.32557148 | |
 |
5.07967133 |  |
 |
2.43087198 | |
 |
1.32895208 |  |
 |
5.28335449 | |
 |
1.61122408 |  |
1129 ~ 2325 nm |
||
|
2.32557148 | |
|
5.07967133 | |
|
2.43087198 | |
|
1.32895208 | |
|
5.28335449 | |
|
1.61122408 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
2 |
| Acid Resistance (S) | SR |
1.0 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
5.23 |
|
| Coloring |  |
||
 |
37 |
||
Relative Partial Dispersions |
|
 |
0.6842 |
 |
0.3116 |
 |
0.2899 |
 |
0.5263 |
 |
1.3080 |
 |
0.5980 |
 |
0.5277 |
 |
|
 |
0.7182 |
 |
0.4737 |
 |
0.5263 |
 |
|
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
||
350 |
||
360 |
||
365 |
||
370 |
0.030 |
|
380 |
0.160 |
|
390 |
0.330 |
|
400 |
0.500 |
|
420 |
0.720 |
|
440 |
0.830 |
|
460 |
0.880 |
|
480 |
0.921 |
|
500 |
0.945 |
|
550 |
0.979 |
|
600 |
0.988 |
|
650 |
0.991 |
|
700 |
0.993 |
|
800 |
0.996 |
|
900 |
0.997 |
|
1000 |
0.997 |
|
1200 |
0.998 |
|
1400 |
0.998 |
|
1600 |
0.997 |
|
1800 |
0.994 |
|
2000 |
0.986 |
|
2200 |
0.966 |
|
2400 |
0.890 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 6.5 |
8.0 |
8.1 |
8.6 |
9.2 |
10.7 |
12.4 |
|
| -20 ~ 0 | 6.7 |
8.2 |
8.3 |
8.9 |
9.5 |
11.1 |
12.9 |
|
| 0 ~ 20 | 6.9 |
8.5 |
8.6 |
9.2 |
9.8 |
11.5 |
13.4 |
|
| 20 ~ 40 | 7.0 |
8.7 |
8.9 |
9.4 |
10.1 |
11.9 |
13.8 |
|
| 40 ~ 60 | 7.2 |
9.0 |
9.1 |
9.7 |
10.4 |
12.2 |
14.3 |
|
| 60 ~ 80 | 7.4 |
9.2 |
9.4 |
10.0 |
10.7 |
12.6 |
14.8 |
|