Note that unless the incident and reflected beams strike the exact center of the hollow retroreflector, they will not overlap but rather be shifted with respect to each other, as illustrated in the animation below. The retroreflector with a SM1-threaded mount is shipped in a unique container to accomodate the mount size please refer to the HRR203-P01 product photo for details. Each mirror with an SM05-threaded mount is shipped inside one of our objective containers for protection and storage please refer to the photo to the right for details. The robust corner cube construction, rotational symmetry, and stability result in low beam deviation of <20 arcsec. Each mirror is mounted in an engraved adapter that has either external SM05 (0.535"-40) or SM1 (1.035"-40) threads for compatibility with SM05- or SM1-threaded mounts. Please note that only UV fused silica retroreflectors are available with a gold coating. A protected silver or gold coating is applied on the polished faces. These hollow retroreflector mirrors are constructed using three substrates of either N-BK7 or UV Fused Silica. Examples of such applications include interferometry and optical delay lines. This insensitivity to mirror alignment and lack of refraction through glass make these hollow retroreflectors ideal for applications where dispersion, chromatic aberrations, material absorption, or front surface reflections from glass prisms are undesirable. Thorlabs' Hollow Retroreflector Mirrors use three orthogonal surfaces to reflect light back to the source at the same angle as the incident beam, regardless of changes in position or alignment, creating an inverted image. Custom Coatings Available (Contact Tech Support).
Protected Gold Coating (UV Fused Silica Substrate).Protected Silver Coating (N-BK7 or UV Fused Silica Substrate).Mirror Reflects an Inverted and Reversed Image Back to Source.Note that the canister has had its top magnet removed. SM05-threaded retroreflector mirrors are shipped inside a storage case composed of a modified OC22 Canister and OC2SM05 Lid.
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