Metallic Mirror for Laboratory Use
Fuzhou Alpha Optics Co., Ltd. [China] 
1.insensitive to wavelength, angle of incidence and polarization. 2.Perkin-Elmer Lambda 900 UV/VIS/NIR spectrophotometer
| Material | Cofficient of Thermal Expansion | Cost | Features |
| BK7 | 7.5*10-6/°C | low | high homogenerty and low bubble |
| Pyrex | 3.25*10-6/°C | low | best, low expansion, resistant to thermal shock |
| UV Fused Silica | 0.52*10-6/°C | high | excellent stability, high laser damage resistance |
| Zerodur | 0+-0.1*10-6/°C | moderate | zero thermal expansion, for ultra-high stability |
| Silicon | 1.2-8.00um | moderate | high thermal conductivity and low density |
| Surface Flatness | Cost | Application |
| lambda/2 | low | where wavefront distortion is not so important as cost |
| lambda/5 | moderate | excellent for most general laser and imaging applications |
| lambda/10 | moderate | in systems with multiple elements |
| lambda/20 | high | for the most demanding laser system |
| Surface Quality | Cost | Application |
| 60-40 | low | low-power laser and imaging system |
| 40-20 | moderate | ideal for applications with collimated beams |
| 20-10 | high | excellent for systems with focused beams |
Metallic Mirror for Laboratory Use
