The U.S. Army Corps of Engineers is organized geographically into eight permanent divisions, one provisional division, one provisional district, and one research command reporting directly to the HQ. Within each division, there are several districts.
Laser Safety Glasses - Holmium Laser. 1  On this page you will find our range of Holmium laser safety glasses , Ruby laser safety glasses, Dye and Erbium Laser Safety Glasses. 2  Important: Australian laser safety standards AS/NZS 2211.3:2002 require L-Ratings to be clearly marked on the laser glasses.
For straightness measurements a normal laser interferometer will be used. In addition to the laser. head and the measurement display unit for straightness measurements, a straightness interferometer. (compensated wollaston prism) and a mirror (straightness reflector) are also required (Fig. 4). The. mirror is mounted on a fixed support behind the module and the wollaston prism runs along the.