Dec 7, 2021
Recent results published with our collaborators show that moving to thinner active regions in THz QC-lasers result in improved thermal properties and higher operating temperatures in continuous-wave mode. Because of the effect of heterostructure interfaces, the...
Jun 6, 2020
The heart of a QC-VECSEL is the amplifying metasurface, in which a reflectarray of antenna-coupled THz QC-gain elements with subwavelength spacing operate collectively to amplify and reflect incident THz radiation. Ordinarily, that occurs through an array of ridge...
Sep 20, 2019
A UCLA-led research team has developed a laser that can be tuned across a broad part of the terahertz band of the light spectrum. The technology could improve drug screening equipment by making them able to analyze more compounds, or the technology could be...
Dec 24, 2017
Our VECSEL makes the cover of IEEE Journal of Selected Topics in Quantum Electronics for Nov/Dec 2017. This issue contains our paper “Terahertz metasurface quantum-cascade VECSELs: theory and performance,” authored by L. Xu, C. A. Curwen, D. Chen, J. L. Reno, T. Itoh,...
Apr 19, 2017
A research team led by UCLA electrical engineers has developed a new technique to control the polarization state of a laser that could lead to a new class of powerful, high-quality lasers for use in medical imaging, chemical sensing and detection, or fundamental...
Oct 6, 2016
Prof. Williams’ Terahertz and Infrared Photonics group is featured in UCLA Engineer Magazine. Link
