All performance specifications stated, including but not limited to, pump-down rates and vacuum levels make the following assumptions:
- The Vacuum Chamber is empty.
- The Vacuum Chamber and other system components are clean and dry.
- The System is being operated at Sea Level
- The ambient temperature is 18°C +/- 2°C
- All system components, including those not supplied by Abbess, are appropriate for the system and are functioning properly.
- The specifications are not impacted by the properties of your product.
If you require performance specifications for conditions other than those listed above, it is vital that you make this known to Abbess Instruments in writing. Generally Abbess Instruments recommends choosing chamber and pumping system qualities capable of achieving a theoretical vacuum at least an order of magnitude better than the desired operational vacuum.
It is to be noted that a specification described as '10-5 Torr' is a range, and means the clean, empty, dry chamber system is capable of reaching some undetermined value between 1.0x10-5 and 9.9x10-5 Torr: The (clean, empty, dry) chamber is deemed compliant whether its As-Built base vacuum is 1.0x10-5 Torr or 9.9x10-5 Torr. It does not mean that the chamber is guaranteed to reach every level within that range.
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Optical Materials
| Material | Transmission Range | Refraction Index Range | Reflection Loss | Thermal Expansion Coefficient |
Density (g/cm3) | (kg/mm2) |
| BAK1 | 280 nm to 2.5 µm |
1.545 to 1.613 |
<2% @ 365 nm to1.53 µm |
8.6 x10-6/K @ 300 K |
3.19 |
530 |
| Barium fluoride (BaF2) |
150 nm to 12 µ |
1.41 to 1.82 |
6.5% @ 5 µm(1.45 @ 5 µm) |
18.1 x10-6/°C @ 273 K |
4.893 |
82 |
| BK7 | 350 nm to 2.5 µm |
1.513 to 1.536 (1.517 @ ~587 nm) |
8.1% @ ~587 nm |
7.1 x 10-6/ K |
2.51 |
610 |
| Calcium fluoride (CaF ) |
130 nm to 10 µm |
1.31 to 1.58 (1.399 @ 5 µm) |
5.4% @ 5 µm |
18.85 x 10-6/ °C |
3.18 |
158.3 |
| Cadmium telluride (CdTe) |
850 nm to 20 µm |
2.57 to 2.88 (2.653 @ 10 µm) |
32% @ 10 µm |
5.9 x 10-6/ K @ 293 K |
6.2 |
45 |
| Cesium bromide (CsBr) |
250 nm to 40 µm |
1.56 to 1.71 |
11.6% @ 11 µm |
47.9 x 10-6/ °C @ 273 K |
4.44 |
19.5 |
| Crystal quartz (SiO2) |
180 nm to 3.5 µm; >40 µm |
1.521 to 1.661 |
8.8% @ 600 nm |
7.1 x 10-6 to 13.2 x10-6/ °C |
2.649 |
741 |
| Fused-silica (SiO2) |
180 nm to 2.2 µm |
1.41 to 1.55 (1.47 @ 4 µm) |
7% @ 400 nm |
0.55 x 10-6/ °C @ 300 K |
2.203 |
500 |
| Gallium arsenide (GaAs) |
0.9 to 16 µm |
3.19 to 3.49 (3.2727 @ 10.33 µm) |
44% @ 10.33 µm |
5.7 x 10-6/ °C @ 300 K |
5.315 |
750 |
| Germanium (Ge) |
1.8 to 23 µm |
4.0021 to 4.1020 (4.0026 @ 11 µm) |
53% @ 11 µm |
6.1 x 10-6/ °C @ 298 K |
5.33 |
780 |
| Lithium fluoride (LiF) |
120 nm to 6 µm |
1.30 to 1.91 (1.392 @ 600 nm) |
5.2% @ 600 nm |
37 x 10-6/ K @ 283 K |
2.639 |
102 |
| Magnesium fluoride (MgF2) |
120 nm to 7 µm |
1.31 to 1.78 (1.413 @ 220 nm) |
5.7% @ 220 nm |
8.9 x10-6 to 13.7 x10/ K |
3.18 |
415 |
| Potassium bromide (KBr) |
230 nm to 25 µm |
1.425 to 1.589 (1.527 @ 10 µm) |
8.3% @ 10 µm |
43 x 10-6/ K @ 300 K |
2.753 |
7 |
| Pyrex | 290 nm to 2.8 µm |
1.473 @ 589 nm |
10% @ 340 nm to 2.2 µm |
3.3 x 10-6/ °C |
2.23 |
481 |
| Sapphire (Al2O3) |
170 nm to 5.5 µm |
1.607 to 1.929 (1.754 @ 1.06 µm) |
14% @ 1.06 µm |
5.0 x 10-6 to 5.6 x10-6/ K |
3.97 |
2000 |
| Silicon (Si) |
1.2 to 15 µm |
3.417 to 3.497 (3.422 @ 5 µm) |
46.2% @ 5 µm |
2.6 x 10-6/ °C @ 20 °C |
2.33 |
1150 |
| Titanium oxide (TiO2) |
430 nm to 5 µm |
2.24 to 2.853 (2.555 @ 690 nm) |
30% @ 2 µm |
7.1 x 10-6 to 9.2 x 10-6/ °C |
4.26 |
879 |
| Zerodur | 400 nm to 2.5 µm |
1.513 to 1.559 (1.542 @ 587.6 nm) |
4.6% @ 587.6 nm |
0.2 x 10-6 to 0.10 x10-6/ K |
2.53 |
620 |
Zinc |
600 nm to 21 µm |
2.327 to 2.675 (2.403 @ 10.6 µm) |
29.1% @ 10.6 µm |
7.1 x 10-6/ °C @ 273 K |
5.27 |
120 |
| Zinc sulfide (ZnS) |
1 to 13 µm |
1.998 to 2.516 (2.192 @ 10.6 µm) |
24.6% @ 10.6 µm |
6.6 x 10-6/ °C @ 273 K |
4.08 |
160 |
Tags: Optical Materials