+++ONLINE KOLLOQUIUM+++Resuscitating molecular lasers: compact widely tunable sources from 200 GHz to > 1 THz (Prof. Federico Capasso)

Date: Apr 21, 2020
Time: 02:30 PM (Local Time Germany)
Speaker: Prof. Federico Capasso
Harvard University, Cambridge Massachusetts, USA
Location: +++ONLINE KOLLOQUIUM+++

Far-IR lasers have fallen largely in disuse due to their very limited tunability, poor power efficiency and bulk. We have realized compact, widely frequency-tunable, bright far IR lasers: a gas-phase molecular laser based on rotational population inversion optically pumped by a quantum cascade laser.

By identifying the essential parameters that determine the suitability of a molecule for a terahertz laser, almost any rotational transition of almost any molecular gas can be made to lase. Nitrous oxide is used to illustrate the broad tunability over 37 lines spanning 0.251 to 0.955 terahertz, each with kilohertz linewidths. Our analysis shows that laser lines spanning more than 1 terahertz with powers greater than 1 milliwatt are possible from many molecular gases pumped by quantum cascade lasers. We expect a wide range of scientific and technological applications to be opened by such lasers.

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