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Alignment Cubes

Optical alignment cubes are used to monitor and qualify systems where critical optical alignment is necessary. Precision Optical offers standard and custom sized optical alignment prisms with precision angles in several glass types as well as stainless steel. For extreme temperature applications, materials such as Zerodur and fused silica are optimal choices due to their low thermal expansion coefficients.

Our optical alignment cubes are polished on five surfaces and coated with a durable protective aluminum mirror coating. Upon request, the base of the prisms may be bonded to custom mounts or outfitted with threaded bushings. Alignment cube assemblies and custom prism geometries are also available.

See our attached (PDF) catalog drawing for our high end alignment cubes.

Get a Quote for Alignment Cubes

Typical Specifications

  • Material: Zerodur, Fused Silica, N-BK7, Stainless Steel, Custom
  • Catalog Sizes (mm): 12.7, 15.0, 19.0, 25.4, 31.8, 38.1; custom sizes also available
  • Dimensional Tolerance: ± 0.012 to ± 0.127mm, or custom
  • Clear Aperture Sizes: < 1mm to edges (85% central diameter is typical)
  • Surface Quality: 60-40 per MIL-PRF-13830_B
  • Bevels: 0.25mm – 0.50mm face width
  • Surface Flatness: λ/8 or custom
  • Angles: < 1 arc second to < 5 arc seconds
  • Coatings: Protective aluminum
  • Custom Alignment Cubes: Assembled with mounting hardware and/or threaded inserts


Donald A. Pearson II

Äpre Instruments

I am always very happy with Precision Optical. Their lead times and delivered product are excellent. I wish more of our suppliers were like Precision Optical!

Brian Monacelli, Ph.D.

Laser Technology Professor - Pasadena City College

Partnering with Precision Optical through their Ensign-Lambert Optics Education Program has allowed over 120 of my laser and optical technology students to gain real-world perspective with hands-on work in optics. These interactions directly motivate the next generation of technicians as they learn first-hand how this fascinating work with industrial hardware will translate into rewarding careers.