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Fused Silica (SiO2) Windows/Rods

Fused Silica (SiO2) Windows/Rods
Fused Silica (SiO2) Windows/Rods Fused Silica (SiO2) Windows/Rods Fused Silica (SiO2) Windows/Rods

Fused silica is the amorphous form of quartz crystal.  Advantages of fused silica material include the extremely good transparency from UV to IR, low coefficient of thermal expansion, large resistance to thermal shock over large temperature excursions, wide thermal operating range and high laser damage threshold.

Our fused silica windows/rods are fabricated from high quality UV grade fused silica glass (UVFS). An extremely large range of thickness/length from 0.15 mm to 300 mm is achievable. Various high quality HR, AR, and partial reflective coatings are available upon request. 

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Basic Properties of Fused Silica Glass:
 

Transparency Range: 185 - 2300 nm

material-fs.GIF (12258 bytes)

Transmission Curve

Density:  2.2 g/cm3
Thermo-Optic Coefficients:
dn/dT= 1.0 x 10-5 /oC
Optical Homogeneity: Δn < 10-6 /cm
Mohs Hardness:  7
Thermal Conductivity: 1.4 W/m/K
Thermal Expansion Coefficient:  α = 0.54 x 10-6/K

Sellmeier Equations: (λ in μm) :
n2=1 +  0.69617λ2/(λ2 - 0.00468) + 0.40794λ2/(λ2 - 0.01351) +  0.89748 λ2/(λ2 - 97.93400)  

Wavelength (nm) Index of refraction
1550 1.4440
1320 1.4466
1064 1.4496
800 1.4533
632.8 1.4570
532 1.4607
400 1.4701
355 1.4761
266 1.4997
213 1.5352

 

 

Specifications of fused Silica Windows:
 

Dimension Tolerance: ± 0.1 mm
Clear Aperture: > 85%
Surface Quality: 20/10 Scratch and Dig
Perpendicularity: < 10 arc min
Parallelism: < 1 arc min
Flatness: λ/8 @ 632.8 nm for T>= 2mm
Transmission Wavefront Distortion: < λ/8 @632.8 nm
Bevel: < 0.25 mm X 45°


 


Coatings:

High quality HR, AR, Broadband AR (BBAR) and partial reflective (PR) coatings are also available upon request.

AR Coatings: R<0.25% at the central wavelength
HR Coatings: R>99.6% at the central wavelength
PR Coatings: R=3-95% at the specified wavelength
Broadband AR coating: R<1% over the specified range

Coating curves: AR@810 nm,  AR@405 nm

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