The recent advance in quantum cascade lasers offers an ideal compact source for mid and far-infrared laser emission.
量子级联激光器作为新近出现的全固化小型理想中远红外激光源，引起了人们极大的兴趣。
2
Directional emission of light guided by quadrupolar-shaped quantum cascade microcavity lasers solves the difficulty about the directional emission of symmetrical microcavity lasers.