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N-BK7 Corner Cube Retroreflectors with Black Overpaint
TECHSPEC® N-BK7 Corner Cube Retroreflectors are designed to reflect any ray or beam entering the prism face, regardless of the orientation of the prism, back onto itself. A mirror will do that only at the normal incidence. As a result, corner cube retroreflectors are useful where precision alignment is impossible or time-consuming. TECHSPEC® N-BK7 Corner Cube Retroreflectors are available with the dihedral surfaces either uncoated or coated with silver. The silver coating provides a larger acceptance angle while the uncoated option, which relies on total internal reflection, provides optimum reflectivity. This coating is covered by a protective black overpaint. Please note, this protective coat increases the diameter of the corner cube retroreflector by 30-60 µm. The input face is available uncoated or coated with an antireflection coating optimized for either visible wavelengths or near infrared wavelengths, including 1064nm and 1550nm.
N-BK7 Corner Cube Retroreflectors provide high-reflectance cube performance with total internal reflection. Ideal for laser alignment, metrology, and interferometry applications requiring consistent optical return paths. Compact, durable, and designed for maximum angular accuracy without the need for precise alignment.
N-BK7 offers excellent transmission in the visible to near-infrared range and high durability, making it suitable for a wide range of environments.
No—corner cubes automatically return beams parallel to the input, eliminating the need for precise alignment.
Yes, they are commonly used in laser interferometry, alignment systems, and metrology due to their consistent beam return path.
Yes, Edmund Optics offers both uncoated and broadband AR-coated options to enhance performance across various wavelengths.
| A (mm) | B (mm) | Stock No. Uncoated | Stock No. Silver Coated | Stock No. Silver and VIS 0° Coated | Stock No. Silver and NIR II Coated |
| 7.16 | 6.1 | #65-250 | #43-305 | #48-605 | #12-488 |
| 12.7 | 10.16 | #43-296 | #45-202 | #48-606 | #12-489 |
| 25.4 | 19.05 | #43-297 | #45-187 | #48-607 | #12-490 |
| 38.1 | 29.21 | #43-298 | #45-189 | #48-608 | N/A |
| 50.8 | 38.1 | #43-299 | #45-191 | #48-609 | N/A |
| 63.5 | 48.26 | #43-300 | #48-593 | #48-616 | N/A |
| 76.2 | 57.15 | #43-301 | #48-594 | #48-617 | N/A |
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