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Coated viewports for UHV applications.

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Thermic Edge LTD.
30 Brunel Road,
St. Leonards on Sea,
East Sussex
TN38 9RT
England
 
Telephone:
+44(0)1424 850811
 
E-mail:
sales@thermic-edge.com
 
 
 
 
 
 
ComponentsVacuum HeatersCalibrated LeaksBellows HosesView Ports

 

Coated viewports for extreme performance

Ceramisis offer a range of competitively priced coated viewports UHV Conflat, ISO or KF including antireflection and ITO coatings

Transmission & Anti-Reflection Coatings

All windows and viewports suffer Fresnel reflectivity losses
Reflectivity r = [(n-1)/(n+1)]2
(where n is the refractive index)

which can be on the order of 6% per face for high refractive index windows such as Sapphire. The reflection is different for p and s polarised waves, and is a function of angle.
This problem can be a severe limitation in many applications requiring optical fidelity, viewing of low luminosity against a high ambient, power transmission etc.

However the problem can be mitigated using anti-reflection coatings. In the case of Sapphire, due to a fortuitous relationship between the refractive indices, a considerable improvement can be obtained using a simple single QWOT (Quarter Wave Optical Thickness) of MgF2.
For more conventional viewport materials such as Kodial and fused quartz this simple approach would provide less obvious, but still useful benefit.

More complex multi-layer dielectric coatings enable a wide variety of tailored transmission / reflection characteristics giving for example virtually zero reflection at a single design wavelength (‘V’ coating) or at two wavelengths (‘W’ coating), or over a wide band BBAR or a neutral density attenuation, and many others.

A 4 layer Broad Band AR Coating – optimised typically but not exclusively for the visible range and giving the best general performance, with a reflected luminosity of only 0.13% and transmitted luminosity of 99.86%


For applications requiring the best transmission at a single wavelength, such as high power laser applications, Ceramisis can provide a ‘V’ Coating having just about zero reflection at a design wavelength 550, 1064 nm etc. for example


Ceramisis can also provide more exotic coated viewports such as MgF2, CaF2, ZnSe, with coatings to provide optimum transmission in the Infrared or UV end of the spectrum
X-Ray Shielding

Lead Glass windows are often used in conjunction with vacuum viewports to reduce the 'leakage' of ionising radiation. However the high lead content gives the glass a high refractive index, and therefore a high reflectivity also.

Again the application of an AR coating can considerably improve the visibility of lead glass windows.
 

Ceramisis Viewport Range

 

Size   16 38/40 64/50 100 150/160 200 250  
Anti-Reflection Coatings              
Kodial   AR - 1QWOT MgF2 both sides optimised at 550nm (Other wavelength  on request)  
  CONFLAT® VPZ16AR VPZ38AR VPZ64AR VPZ100AR VPZ150AR      
  KF   KVPZ40LAAR KVPZ50LAAR          
  ISO       ISO100VPZAR ISO150VPZAR ISO200VPZAR ISO250VPZAR  
Kodial   BBAR - 4 layer Broad Band  both sides optimised for 400nm-600nm (Other wavelength  on request)  
  CONFLAT® VPZ16BBAR VPZ38BBAR VPZ64BBAR VPZ100BBAR VPZ150BBAR      
  KF   KVPZ40LABBAR KVPZ50LABBAR          
  ISO       ISO100VPZBBAR ISO150VPZBBAR ISO200VPZBBAR ISO250VPZBBAR  
Kodial    V ' Coating - 2 layer  both sides optimised for wavelength specified by customer  
  CONFLAT® VPZ16VAR VPZ38VAR VPZ64VAR VPZ100VAR VPZ150VAR      
  KF   KVPZ40LAVAR KVPZ50LAVAR          
  ISO       ISO100VPZVAR ISO150VPZVAR ISO200VPZVAR ISO250VPZVAR  
Quartz   AR - 1QWOT MgF2 both sides optimised at 550nm (Other wavelength  on request)  
  CONFLAT® VPQ16AR VPQ38AR VPQ64AR VPQ100AR VPQ150AR      
  KF   KVPQ40LAAR KVPQ50LAAR          
  ISO       ISO100VPQAR ISO150VPQAR ISO200VPQAR ISO250VPQAR  
Quartz   BBAR - 4 layer Broad Band  both sides optimised for 400nm-600nm (Other wavelength  on request)  
  CONFLAT® VPQ16BBAR VPQ38BBAR VPQ64BBAR VPQ100BBAR VPQ150BBAR      
  KF   KVPQ40LABBAR KVPQ50LABBAR          
  ISO       ISO100VPQBBAR ISO150VPQBBAR ISO200VPQBBAR ISO250VPQBBAR  
Quartz    V ' Coating - 2 layer  both sides optimised for wavelength specified by customer  
  CONFLAT® VPQ16VAR VPQ38VAR VPQ64VAR VPQ100VAR VPQ150VAR      
  KF   KVPQ40LAVAR KVPQ50LAVAR          
  ISO       ISO100VPQVAR ISO150VPQVAR ISO200VPQVAR ISO250VPQVAR  
Sapphire   AR - 1QWOT MgF2 both sides optimised at 550nm (Other wavelength  on request)  
  CONFLAT® VPS16AR VPS38AR VPS64AR VPS100AR VPS150AR      
  KF   KVPS40LAAR KVPS50LAAR          
  ISO       ISO100VPSAR ISO150VPSAR ISO200VPSAR ISO250VPSAR  
Sapphire   BBAR - 4 layer Broad Band  both sides optimised for 400nm-600nm (Other wavelength  on request)  
  CONFLAT® VPS16BBAR VPS38BBAR VPS64BBAR VPS100BBAR VPS150BBAR      
  KF   KVPS40LABBAR KVPS50LABBAR          
  ISO       ISO100VPSBBAR ISO150VPSBBAR ISO200VPSBBAR ISO250VPSBBAR  
Sapphire    V ' Coating - 2 layer  both sides optimised for wavelength specified by customer  
  CONFLAT® VPS16VAR VPS38VAR VPS64VAR VPS100VAR VPS150VAR      
  KF   KVPS40LAVAR KVPS50LAVAR          
  ISO       ISO100VPSVAR ISO150VPSVAR ISO200VPSVAR ISO250VPSVAR  
Conductive Coatings  
Kodial   Anti-charge build up ITO <2kW / sq  
  CONFLAT® VPZ16ITO VPZ38ITO VPZ64ITO VPZ100ITO VPZ150ITO      
  KF   KVPZ40ITO KVPZ50ITO          
  ISO       ISO100VPZITO ISO150VPZITO ISO200VPZITO ISO250VPZITO  
    *can also be applied to Quartz and Sapphire etc. viewports  
Radiation Shielding - Medex lead glass cover for any of the above (3-5mm thick)
  CONFLAT® LG16 LG38 LG64 LG100 LG150      
    AR - 1QWOT MgF2 both sides optimised at 550nm (Other wavelengths on request)  
  CONFLAT® LG16AR LG38AR LG64AR LG100AR LG150AR      
                   

 

 

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