The erbium family: There are two distinct wavelengths that use erbium: Erbium, chromium:YSGG (2780 nm) has an active medium
of a solid crystal of yttrium scandium gallium garnet that is doped with erbium and chromium and Erbium:YAG (2940 nm) has an active medium
of a solid crystal of yttrium aluminum garnet that is doped with erbium.
This is a subtle but fundamental shift in presenting video as an active medium
Delivery of the active medium
voltage electricity for Base 1, Base 2 and Base 3 owned SHATPD St.
Most lasers possess two important ingredients: an active medium
in which energy can be turned into light and amplified, and some resonant enclosure in which the developing coherent light can build up to a potent beam emerging as laser light.
Laser diode an electronically driven solid state laser with an active medium
has emerged as one the best alternatives for projections, laser pointers, and storages.