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Mirrors

Metal Coated Mirror

Metal Coated Mirror                

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%

 


Back side unpolished or black painted upon request.                   


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