Penta Prisms
Penta prism can deviate an incident beam without inverting or reversing to 90°.The deviation angle of 90° is independent of any rotation of the prism about an axis parallel to the line of intersection of the two reflecting faces. It is commonly used in Plumb Level, Surveying, Alignment, Range finding and Optical Tooling. The reflecting surfaces of this Prism must be coated with a metallic or dielectric coating. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum.
Specifications:
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Material:
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BK7 Grade A Optical Glass
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Dimension (mm):
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2.5x2.5 ~ 100x100
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Dimension Tolerance (mm):
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+/-0.2 (General), +/-0.05 (High Precision)
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90° Deviation Tolerance:
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＜1 arc min.(General),＜3 arc sec.(High Precision)
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Angle Tolerance:
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3 arc min. (General), 3 arc sec. (High Precision)
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Surface Quality
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80/50 (General), 10/5 (High Precision)
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Flatness (per 25mm@633nm)
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λ(General), λ/8 (High Precision)
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Reflection:
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＞90%@400-700nm
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Note:
(1). Besides N-BK7 glass, other optical glass is available for custom-made Penta Prisms.
(2). Penta Prism at bigger size is available.
(3). Typical deviation tolerance is 1 minute, better precision such as 30 sec, 10 sec, 5 sec or 3 sec is available.
(4). Typical reflection is >90% by Al coating, other metal coating such as Ag, Cu, or High Reflection Dielectric Coating is available.
(5). Besides uncoating, Anti-Reflective(AR) coating is available upon request.
