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1.UV-Al:
Only this metal mirror can be used to UV spectrum
2.Protected-MHR:
MAL, MAu and MAg are three types of Protected MHR
1)MAL can be used in VIR and IR spectrum, has good mechanical durability.
2)MAu can be used in IR spectrum
3)MAg used in VIR and IR, has the highest reflectance in metal mirror, but its mechanical durability is low, can’t be used long time.
3.Enhanced-MHR:
Add some dielectric layers on the metal, to improve the reflectance at a wide wavelength range.
| Spec | Protective Gold | Protective Aluminum | UV Enhanced Aluminum | Protective Silver |
| Wavelength | 750-1500nm | 400-700nm | 200-700nm | 500-800nm |
| Reflective | >96% | >88% | >85% | 98% |
| Surface Flatness | Lambda/4 | Lambda/4 | Lambda/4 | Lambda/4 |
| Surface Quality | 60-40 S/D | 60-40 S/D | 60-40 S/D | 60-40 S/D |
| Damage Threshold | 0.8J/cm² | 0.3J/cm² | 0.3J/cm² | 0.5J/cm² |
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