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Fresnel Biprisms

Fresnel Biprisms
Fresnel Biprisms Fresnel Biprisms Fresnel Biprisms

Material: High grade BK7 (N-BK7) or UV grade fused silica (UVFS) glass
Large apex angle close to 180°
Widely used in interferometers, auto/cross-correlators, and GRENOUILLEs
.
With a base of 1.0mm for apex angle > 160°.
  With/without a base for apex angle =< 160°

Uncoated for standard products.  AR coating available upon request.

 

 

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 Basic Properties of BK7 and N-BK7 Glass:
 

       

BK7

N-BK7 (RoHS)
Transparency Range 360 - 2000 nm 360 - 2500 nm
Density 2.51 g/cm3 2.51 g/cm3
Thermo-Optic
Coefficients (dn/dT)
2.3 x 10-6 /oC 2.3 x 10-6 /oC
Optical Homogeneity Δn < 10-6/cm Δn < 10-6/cm
Knoop Hardness  610  610 
Thermal Conductivity 1.1 W/m/K 1.1 W/m/K
Thermal Expansion
Coefficients
 8 x 10-6/K

7.1 x 10-6/K

Sellmeier Equations
(
λ in µm)
n2=1+1.03961λ2/(λ2- 0.0060007 ) + 0.23179λ2/(λ2-0.020018)+1.01047 λ2/(λ2-103.5600)   n2=1+1.03961λ2/(λ2- 0.0060007 ) + 0.23179λ2/(λ2-0.020018)+1.01047 λ2/(λ2-103.5607)
Wavelength (nm) Index of Refraction
400 1.5308 1.5308
532 1.5194 1.5194
588 1.5167 1.5167
632.8 1.5150 1.5150
800 1.5108 1.5108
1064 1.5066 1.5066


Transmission curve:

material-bk7.GIF (10870 bytes)
 

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

 

 





























 


Fresnel Biprism Specifications


Dimension Tolerance:+/- 0.2 mm
Protective Bevel:  ~ 0.2 mm for biprisms without a base
Flatness:
λ/4 at 632.8 nm
Surface Quality: 20-10 scratch and dig
Clear Aperture: > 80%

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