| OHARA | L-LAH53 |
806409 811406 |
||||||
| Refractive Index |  |
1.80610 | Abbe Number |  |
40.9 | Dispersion |  |
0.01972 |
| 1.806100 | 40.88 | 0.019718 | ||||||
 |
1.810780 |  |
40.63 |  |
0.019954 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.76076 |
 |
1.97009 | 1.76780 |
 |
1.52958 | 1.77552 |
 |
1.12864 | 1.78286 |
 |
1.01398 | 1.78549 |
 |
0.85211 | 1.79031 |
 |
0.76819 | 1.79375 |
 |
0.70652 | 1.79697 |
 |
0.65627 | 1.80024 |
 |
0.64385 | 1.80116 |
 |
0.6328 | 1.80203 |
 |
0.58929 | 1.80592 |
 |
0.58756 | 1.80610 |
 |
0.54607 | 1.81078 |
 |
0.48613 | 1.81996 |
 |
0.47999 | 1.82112 |
 |
0.44157 | 1.82967 |
 |
0.435835 | 1.83117 |
 |
0.404656 | 1.84075 |
 |
0.365015 | 1.85768 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
534 |
| Annealing Point (°C) |
AP |
558 |
| Transformation Temperature (°C) |
Tg |
574 |
| Yield Point (°C) |
At |
607 |
| Softening Point (°C) |
SP |
646 |
| Expansion Coefficient   |
-30~+70°C |
59 |
+100~+300°C |
72 |
|
Thermal Conductivity |
k |
0.862 |
Mechanical Properties |
||
Young's Modulus |
E |
1151 |
| Rigidity Modulus |
G |
443 |
| Poisson's Ratio |  |
0.298 |
| Knoop Hardness | Hk |
660 [7] |
| Abrasion | Aa |
76 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.014747 |
 |
0.006489 |
 |
0.005860 |
 |
0.010544 |
 |
0.025074 |
 |
0.011216 |
 |
0.009575 |
 |
0.026505 |
 |
0.015670 |
 |
0.009621 |
 |
0.010333 |
 |
0.036562 |
Deviation of Relative Partial Dispersions |
|
 |
0.0094 |
 |
0.0037 |
 |
-0.0082 |
 |
-0.0065 |
 |
-0.0385 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.90781372 | |
 |
2.63500130 |  |
 |
1.28144614 | |
 |
1.03413285 |  |
 |
4.19041155 | |
 |
9.57068567 |  |
1129 ~ 2325 nm |
||
|
1.90781372 | |
|
2.63500130 | |
|
1.28144614 | |
|
1.03413285 | |
|
4.19041155 | |
|
9.57068567 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
4 |
| Weathering Resistance (S) | W(S) |
1 |
| Acid Resistance (S) | SR |
51.2 |
| Phosphate Resistance | PR |
2.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
4.49 |
|
| Coloring |  |
40 |
|
 |
34 |
||
Relative Partial Dispersions |
|
 |
0.7479 |
 |
0.3291 |
 |
0.2972 |
 |
0.5347 |
 |
1.2716 |
 |
0.5688 |
 |
0.4856 |
 |
1.3442 |
 |
0.7853 |
 |
0.4822 |
 |
0.5178 |
 |
1.8323 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
0.130 |
|
350 |
0.480 |
|
360 |
0.700 |
|
365 |
||
370 |
0.840 |
|
380 |
0.908 |
|
390 |
0.940 |
|
400 |
0.959 |
|
420 |
0.976 |
|
440 |
0.983 |
|
460 |
0.988 |
|
480 |
0.991 |
|
500 |
0.995 |
|
550 |
0.998 |
|
600 |
0.998 |
|
650 |
0.999 |
|
700 |
0.999 |
|
800 |
||
900 |
||
1000 |
||
1200 |
||
1400 |
||
1600 |
||
1800 |
||
2000 |
||
2200 |
||
2400 |
||
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | ||||||||
| -20 ~ 0 | ||||||||
| 0 ~ 20 | ||||||||
| 20 ~ 40 | ||||||||
| 40 ~ 60 | ||||||||
| 60 ~ 80 | ||||||||