After aluminium (Al), silver (Ag) or Gold (Au) coating, the mirror show high relfection perfance for very wide broadband. Generally, we over coat the protective SiO2 or MgF2 layer outside the metal layer to avoid the damage from the environment.
Metal coating is less sensitive to variations in incident angle, polarization, and wavelength than dielectric coatings
Metal-Coated Mirror Selection Guide |
Wavelength Range | Avg. Reflectance | Coating |
250 nm – 450 nm | >85% | UV Enhanced Aluminum |
450 nm- 20 um | >90% for 450 nm - 2 µm >95% for 2µm – 20µm | Protected Aluminum |
| >97% for 450 nm - 2 um >95% for 2µm – 20µm | Protected Silver |
800 nm - 20 um | >96% | Protected Gold |
>97% | Unprotected Gold |
UV Enhanced Aluminum Coating Design
Characteristic:
. UV-Enhanced Aluminum: Ravg>85% for 250 - 450nm
. Round and Square Versions Available
General Specifications:
Dimension(mm) | Dia12.7 | 12.7x12.7 | Dia25.4 | 25.4x25.4 | Dia50.8 | 50.8x50.8 | upon request |
Wavelength Range | 250 - 450 nm |
Substrate | H-K9L / UV Fused Silica |
Reflectance | Ravg>85% from 250 to 450 nm |
Dimension Tolerance | +/- 0.1mm |
Surface Quality | 40-20 scratch and dig |
Surface Flatness | λ/4 up to λ/10 @ 633 nm |
Parallelism | < 3 arc min |
Clear Aperture | >90% |
Protected Aluminum Coating Design
Characteristic:
. Protected Aluminum: Ravg>90% from 450 nm - 2 µm, Ravg>95% from 2 µm - 20 µm
. Round and Square Versions Available
General Specifications:
Dimension(mm) | Dia12.7 | 12.7x12.7 | Dia25.4 | 25.4x25.4 | Dia50.8 | 50.8x50.8 | upon request |
Wavelength Range | 450 nm - 20 µm |
Substrate | H-K9L / Fused Silica |
Reflectance | Ravg>90% from 450 nm to 2 µm Ravg>95% from 2 µm to 20 µm |
Dimension Tolerance | +/- 0.1mm |
Surface Quality | 40-20 scratch and dig |
Surface Flatness | λ/4 up to λ/10 @ 633 nm |
Parallelism | < 3 arc min |
Clear Aperture | >90% |
Protected Silver Coating Design
Characteristic:
. High Reflectance in Visible and NIR Regions
. Round, Rectangular, and Square Mirror Available
General Specifications:
Dimension(mm) | Dia12.7 | 12.7x12.7 | Dia25.4 | 25.4x25.4 | Dia50.8 | 50.8x50.8 | upon request |
Wavelength Range | 450 nm - 20 µm |
Substrate | H-K9L / Fused Silica |
Reflectance | Ravg>97 % from 450 nm to 2 µm Ravg>95% from 2 µm to 20 µm |
Dimension Tolerance | +/- 0.1mm |
Surface Quality | 40-20 scratch and dig |
Surface Flatness | λ/4 up to λ/10 @ 633 nm |
Parallelism | < 3 arc min |
Clear Aperture | >90% |
Protected Gold Coating Design
Characteristic:
. Average Reflectance > 96% from 800 nm to 20 µm
. Round and Square Mirrors Available
General Specifications:
Dimension(mm) | Dia12.7 | 12.7x12.7 | Dia25.4 | 25.4x25.4 | Dia50.8 | 50.8x50.8 | upon request |
Wavelength Range | 800 nm - 20 µm |
Substrate | H-K9L / Fused Silica |
Reflectance | Ravg>96% from 800 nm - 20 µm |
Dimension Tolerance | +/- 0.1mm |
Surface Quality | 40-20 scratch and dig |
Surface Flatness | λ/4 up to λ/10 @ 633 nm |
Parallelism | < 3 arc min |
Clear Aperture | >90% |
Unprotected Gold Coating Design
Characteristic:
. Average Reflectance > 97% from 800 nm to 20 µm
. Round and Square Mirrors Available
. Useful for Polarization Sensitive and Ultrafast Applications
General Specifications:
Dimension(mm) | Dia12.7 | 12.7x12.7 | Dia25.4 | 25.4x25.4 | Dia50.8 | 50.8x50.8 | upon request |
Wavelength Range | 800 nm - 20 µm |
Substrate | H-K9L / Fused Silica |
Reflectance | Ravg>97% from 800 nm - 20 µm |
Dimension Tolerance | +/- 0.1mm |
Surface Quality | 40-20 scratch and dig |
Surface Flatness | λ/4 up to λ/10 @ 633 nm |
Parallelism | < 3 arc min |
Clear Aperture | >90% |
Address：Haoyue Road Luyuan District,Changchun City,
Jilin Province ，P. R. China
Email：sales@ocean-opto.com
Tel：+86-431-87675449
