A team of materials science researchers led by Shui-Qing “Fisher” Yu of the University of Arkansas has demonstrated use of an electrically injected laser made with germanium tin. The materials in the design are low cost and could improve microprocessing speeds for applications using the diode laser as a semiconducting material for circuits on electronic devices. The laser operated effectively in pulsed conditions up to 100 K, or −279 °F. According to the researchers, germanium tin can be easily integrated into electronic circuits, such as those found in computer chips and sensors. In addition to low cost and light weight, the material could support electronic components that consume relatively low levels of power. Those components would rely on light to sense and transmit information. Researchers in Yu’s lab have previously demonstrated germanium tin’s efficacy as a powerful semiconducting alloy. The current research stems from the laboratory’s earlier report of the development of a first-generation, “optically pumped” laser. In that work, Yu and his team injected light into germanium tin. Fisher Yu, University of Arkansas. Courtesy of the University of Arkansas. “Our results are a major advance for group IV-based lasers,” Yu said. “They could serve as the promising route for laser integration on silicon and a major step forward significantly improving circuits for electronic devices.” The Air Force Office of Scientific Research sponsored the research. Yiyin Zhou, a doctoral student in the University of Arkansas’ microelectronics-photonics program, authored the article introducing the demonstration. Collaborators include researchers from Arizona State University, the University of Massachusetts Boston, Dartmouth College, Wilkes University, and semiconductor equipment manufacturer Arktronics. The work is published in Optica, a publication of The Optical Society (OSA) (www.doi.org/10.1364/OPTICA.395687).