短语词组短语Nd -doped YAG laser crystal 掺钕钇铝石榴石激光晶体impulse nd -yag laser 脉冲ndnd yag solid -state laser ndyag固体激光器nd yag doubled -frequency laser 掺钕钇铝石榴石激光Q -switch Nd-YAG Laser 钕 返回 nd yag-laser