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Hot/Cold Mirrors
So-called "hot" mirrors will reflect infrared light while transmitting visible light. Visa versa, a "cold" mirror reflects visible light while transmitting infrared. Hot or cold mirrors are often employed in projection systems to reduce the heat of the visible beam.
| Type |
Wavelength R/T, nm |
Average
refletion, % |
Average
transmission, % |
AOI, deg |
Damage threshold,
J/cm2, 10 ns pulse
|
| Hot |
890-1090/740-820 |
98 |
90 |
0, 45 |
3 |
| Hot |
700-1050/400-630 |
98 |
85 |
0, 45 |
3 |
| Cold |
420-650/750-1130 |
98 |
85 |
0, 45 |
3 |
|
Fig. 1 HT coating at 740-820 nm and HR coating at 900-1100 nm, AOI=0°.
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