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.
Lanthanum is used in hydrogen sponge alloys, which take up to 400 times their own volume of hydrogen gas. Lanthanum is also used to make night vision goggles (infrared-absorbing glass).High quality camera and telescope lenses contain lanthanum oxide (La 2 O 3) making use of its high refractive index and low dispersion.anthanum is also used to make night vision goggles (infrared-absorbing glass). High quality camera and telescope lenses contain lanthanum oxide (La 2 O 3) making use of its high refractive index and low dispersion.