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Wavelength Separating/Combining Coatings
Very often it is necessary to separate a laser's harmonics from its fundamental wavelength, or to combine dissimilar wavelengths so that they will travel along the same optical path. These specialized functions are performed using engineered multi-layer coatings, resulting in optical elements called beam separators and beam combiners, respectively.
| Wavelength R/T, nm |
Minimal
reflection, % |
Minimal
transmission, % |
AOI, deg |
Damage threshold,
J/cm2, 10 ns pulse
|
| 532/1064 |
99 |
93 |
0, 45 |
3 |
| 355/532 & 1064 |
99 |
90 and 92, respectively |
0, 45 |
3 |
| 800/400 |
99 |
90 |
0, 45 |
3 |
| 1064/808 |
99 |
93 |
0, 45 |
3 |
|
Fig. 1 HR coating at 532 nm and HT coating at 1064 nm, AOI=45°, unpolarized radiation.
 Fig. 2 HR coating at 355 nm and HT coating at 532 and 1064 nm, AOI=0°. | |
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