SIGMAKOKI

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KRPB/KRPB4
A=B
Surface flatness of substrate
Angle tolerance (90°)
Angle tolerance (45°)
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The knife edge prism is polished to the sharp edges of the right angle surfaces and have no chamfers on these edges.

◦With knife edge prism having no coating (KRPB) by using light in the range of 0±5.7 degrees angle of incidence to the slope surface the total reflection critical angle is obtained.

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Guide

▶Contact our Sales Division with your request for custom prisms not listed on our website or in the catalog.
▶Please refer to here for Wavelength Characteristic Data (Reference Data, EXCEL file format).

Attention

▶Knife-edge ridge right angle is very easily damaged so please carefully handled.
▶The knife edge will not be able to be cleaned with lens paper. Use an air blower to remove small dust particles.
▶A dimension measured is slightly shorter than the catalog size because it contains chamfer dimension. Dimensional tolerances are defined by the sides of the triangle with the slope and two bottom surface.
▶KRPB (with a no coat), the reflectance of the reflection above the critical angle is nearly 100%, there is a loss of about 8% in the reflection of the input and the exit surface of the prism.
▶Sometimes when dirt or fingerprints on the surface with no coating, total reflection will not happen anymore at the critical angle. Do not contact anything on the no coated surface.

Common Specifications
MaterialBK7 (Refractive index nd=1.517)
Ridge ProcessingRight-angle ridge ; knike edge (Not chamfered) Other ridge ; Chamfered
CoatingUncoated (3 surfaces)
Clear apertureCircle or ellipse that inscribed in a rectangular of 90% of the dimensions
Outline Drawing

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Schematic

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Typical Transmittance Data
■Transmittance Data for BK7

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T: Transmission
Spec
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Part Number
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    JP Yen Stock Qty
KRPB-10-4M
KRPB-15-4M
KRPB-20-4M
KRPB-25-4M
KRPB-30-4M
KRPB-10-10H
KRPB-15-10H
KRPB-20-10H
KRPB-25-10H
KRPB-30-10H

10mm

λ/4

±1′

±1′

10−5

15mm

λ/4

±1′

±1′

10−5

20mm

λ/4

±1′

±1′

10−5

25mm

λ/4

±1′

±1′

10−5

30mm

λ/4

±1′

±1′

10−5

10mm

λ/10

±5″

±30″

10−5

15mm

λ/10

±5″

±30″

10−5

20mm

λ/10

±5″

±30″

10−5

25mm

λ/10

±5″

±30″

10−5

30mm

λ/10

±5″

±30″

10−5

RoHS  

¥7,150

IN STOCK
RoHS  

¥11,400

IN STOCK
RoHS  

¥18,050

IN STOCK
RoHS  

¥23,750

LOW
RoHS  

¥34,200

IN STOCK
RoHS  

¥11,400

IN STOCK
RoHS  

¥17,100

IN STOCK
RoHS  

¥28,500

IN STOCK
RoHS  

¥37,050

IN STOCK
RoHS  

¥42,750

IN STOCK