Rare earth material evaporation device for laser optical fiber preform rod gas phase doping

The invention discloses a rare earth material evaporation device for laser optical fiber preform rod gas phase doping. The rare earth material evaporation device comprises raw material boxes with topopenings, a top cover and a hollow shaft lever, wherein the top cover is stacked on the raw material boxes and seals the openings of the raw material boxes; at least two raw material boxes are stackedin sequence; the raw material box positioned on the upper layer seals the opening of the raw material box on the lower layer; the top cover is arranged on the raw material box on the uppermost layerand seals the opening of the raw material box on the uppermost layer; the top cover and each raw material box are arranged on the hollow shaft lever in a sleeving manner; a heater is arranged in the hollow shaft lever; axially penetrating air holes are formed in the various raw material boxes; and the air holes in two adjacent layers of raw material boxes are formed in a staggered manner, so thatgas phase raw materials prod