Diana Chin ’14


Mechanical and Aerospace Engineering

Project Title

Mode Filtering of a λ ≈ 14 μm Quantum Cascade Laser via Single and Multi-Mode Fibers

Presentation Link

View Diana's Presentation

This summer I worked as an intern in Professor Claire Gmachl’s group in the ­Department of Electrical Engineering. I helped conduct research on improving the beam ­quality of quantum cascade lasers. These lasers can potentially be used in a ­variety of ­portable devices for sensing trace gases in the atmosphere, and can thus be key in ­detecting things like global warming effects or the development of nuclear ­weapons. ­However, in order for their beams to be most effectively focused and utilized, they have to be refined. I worked on trying to reduce the number of interfering ­higher ­order modes of a Quantum Cascade laser by coupling the laser beam through hollow core glass ­waveguides. By ­imaging, graphing, and comparing the intensity profiles of the ­laser light ­before and after the use of different fibers, we were able to find that the use of a single mode fiber was ­effective in filtering out a great deal of the higher order modes. Through my own ­experiences and through the support of the Gmachl group, I feel that I was able to learn a great deal this summer about both my topic and about the research process in general.

Internship Year


Project Category

Climate and Energy


Princeton University, Princeton, New Jersey


Claire Gmachl, Eugene Higgins Professor of Electrical Engineering