For the observation of cold matter in the interstellar medium, astronomers need instruments for the detection of terahertz radiation. Specific high-resolution instruments are based on terahertz quantum-cascade lasers, but operate only at cryogenic temperatures. Physicists of the Paul Drude Institute (PDI) in Berlin, Germany, have now developed a terahertz quantum-cascade laser, which operates at significantly higher temperatures than previously achieved. The new development allows for the use of more compact cooling systems—also reducing the obstacles for many other applications.
from Phys.org: Physics News http://ift.tt/1ivYErl