1、第1步，石英管缩颈抽真空后开始烧结缩颈，缩颈部位烧至凹陷即可Step 1: Silica tube neckingFrit the necking after the vacuumizing until the necking part gets sunken
3、第3步，烧结封管抽真空充气氛后，烧结石英柱的位置进行真空封管Step 3: Fritting and seali荏鱿胫协ngFrit the silica column and conduct tube sealing after the vacuumizing and gas atmosphere filling
