Thermoelectrically Cooled THz Quantum Cascade Laser (IMAGE) ETH Zurich Department of Physics Caption Schematic of one laser ridge in the thermoelectrically cooled THz quantum cascade laser. Credit Faist group, ETH Zurich Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.