Penta Prism

Penta Prism

Pentagon prism

Schematic drawing

Penta Prism(Pentagonal Prims) is a five-sided prism containing two reflecting surfaces at 45deg to each other, and two refracting faces perpendicular to the entering and emerging beams. The deviation angle of 90deg is thus independent of the orientation of the prism, making it especially important in applications in which the prism orientation cannot be precisely controlled. Due to the geometry that total internal reflection cannot be used, the reflecting surfaces must be coated with a metallic or dielectric coating. Photonchina standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum. The coated surfaces can be painted black.

Photonchina designs and manufactures pentagonal prisms which reflect light rays through a 90° angle by two reflections and does invert or revert the image. The reflecting surfaces are aluminized. Slight movement of the prism does not affect the true right angle at which light rays are reflected. It also shortens the optical path length of an instrument.

Glass material of N-BK7 (Schott) or H-K9L(CDGM) are typically used in production of pentagon prisms. However, other materials are also available for some applications designated. With the rich experience in producing these prisms and high precision equipment both in making and inspection, Photonchina has been satisfying customers worldwide for more than a decade.

Photonchina Specifications:

Material: BK7 or other glass material
Diameter Tolerance: +0.0, -0.2mm
Angular Tolerance: see the table as follow
Flatness: /2 @ 632.8nm
Surface Quality: 60/40
Clear Aperture: >80%
Bevel: <0.25mm X 45°
Coating: * S1&S2: Single layer MgF2 coating
* S3&S4: Aluminized and painted black
30 Sec. Deviation 10 Sec. Deviation
Part No. Part No.
7×5 PC-PTP1-A201 PC-PTP1-B301
7×6 PC-PTP1-A202 PC-PTP1-B302
10×10 PC-PTP1-A203 PC-PTP1-B303
15×15 PC-PTP1-A204 PC-PTP1-B304
20×20 PC-PTP1-A205 PC-PTP1-B305
30×30 PC-PTP1-A206 PC-PTP1-B306