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Fresnel Biprisms

Material: High grade N-BK7 or UV grade fused silica (UVFS)
  glass
Large apex angle close to 180°
Widely used in interferometers, auto/cross-correlators,
  and
GRENOUILLEs



Shapes and Geometries


     With base                   Without base

 

Standard Products
 
Part No.   Material Apex Angle  Base Size(mm) Coating In stock
 N-BK7 biprisms
FBP1510G-160 N-BK7 160° 15x10x1.0 uncoated Yes
FBP1515G-160N N-BK7 160° 15x15x0
(no base)
uncoated Email/Call
FBP2020G-160 N-BK7 160° 20x20x1.0 uncoated Yes
FBP4040G-160N N-BK7 160° 40x40x0
(no base)
uncoated Email/Call
FBP5050G-160N N-BK7 160° 50x50x0
(no base)
uncoated Yes
FBP2020G-170 N-BK7 170° 20x20x1.0 uncoated Yes
FBP1515G-175 N-BK7 175° 15x15x1.0 uncoated Email/Call
FBP2020G-175 N-BK7 175° 20x20x1.0 uncoated Yes
FBP2020G-177 N-BK7 177° 20x20x1.0 uncoated Yes
 UV fused silica biprisms
FBP1515Q-160N UVFS 160° 15x15
(no base)
uncoated Yes
FBP1515Q-160 UVFS 160° 15x15x1.0 uncoated Email/Call
FBP2020Q-160 UVFS 160° 20x20x1.0 uncoated Yes
FBP4040Q-160N UVFS 160° 40x40
(no base)
uncoated Email/Call
FBP5050Q-160N UVFS 160° 50x50
(no base)
uncoated Email/Call
FBP2020Q-170 UVFS 170° 20x20x1.0 uncoated Email/Call
FBP1515Q-175 UVFS 175° 15x15x1.0 uncoated Email/Call
FBP2020Q-175 UVFS 175° 20x20x1.0 uncoated Yes
FBP2020Q-175-BBAR680/1100 UVFS 175° 20x20x1.0 BBAR 680-1100nm Yes
FBP2020Q-177 UVFS 177° 20x20x1.0 uncoated Email/Call

The apex angle, dimensions, and coating of the biprism diverse significantly from application to application.  Please contact us for the biprisms that best suit your applications.

Coatings:

Fresnel biprisms are uncoated unless the coating is specified.

AR coating on the three polished faces at the specified wavelength or in the specified wavelength range are available upon request.  Please specify the coating and append to the part number, e.g. FBP2020Q-175-BBAR680/1100 for the biprism with the broadband AR coating @ 680-1100nm.

 

Fresnel Biprism Specifications

Dimension Tolerance: +/-0.2mm
Protective Bevel:  ~ 0.2mm 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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