Surface-Reflecting Prism
The surface-reflecting hollow corner-cube retroreflector uses three externally coated reflecting faces arranged as a corner cube. Compared with a solid corner-cube prism, it returns incident light, uses a lightweight hollow structure, and avoids material absorption and chromatic aberration. The hollow design reduces weight and sensitivity to position and vibration, returning incident parallel light with very high precision regardless of incidence angle. Propagation through air avoids the material absorption and chromatic aberration of solid-glass retroreflectors. A large housing rear panel has various mounting holes. Under full illumination, beam deviation is the maximum departure from parallelism of any reflected beam emerging from any of the six subapertures. The output wavefront under full illumination is specified as peak-to-valley deformation in units of λ, where λ=633nm. A patented cushioned mounting design improves vibration resistance.
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