Back

Joachim Wagner

Joachim Wagner

Institute for Applied Solid State Physics (IAF), Germany

Title: Recent advances in high-performance 2.X μm VECSEL

Biography

Scientists are pursuing a variety of semiconductor systems to generate mid-infrared (3-5 µm) laser radiation for applications in environmental monitoring, homeland security, and medical diagnostics through the development of efficient, portable chemical sensors, infrared countermeasures, and breath analyzers. Antimonide-based heterostructures that employ an indirect type-II quantum well configuration have proved to be a very promising approach in this wavelength range, with notable recent advances in interband cascade lasers. However, there remain challenges in this system in achieving excellent performance at high operating temperatures. To develop practical mid-infrared chemical sensors that operate at ambient temperatures with low power requirements, it is critically important to reduce the rate at which the lasing thresholds rise as a function of increasing temperature in these materials; at present characteristic temperatures plateau around 60 K. Recent results in optical pumping of type-II antimonide-based semiconductor lasers with W-shaped quantum wells will be presented, as will new projects employing electrically injected interband cascade lasers as well as semiconductor lasers with integrated graphene transparent contacts. These projects have a common theme designed to reveal the optoelectronic mechanisms that limit high temperature operation in antimonide-based type-II W lasers, with a particular focus on increasing the characteristic temperature of these materials and devices

Abstract

Scientists are pursuing a variety of semiconductor systems to generate mid-infrared (3-5 µm) laser radiation for applications in environmental monitoring, homeland security, and medical diagnostics through the development of efficient, portable chemical sensors, infrared countermeasures, and breath analyzers. Antimonide-based heterostructures that employ an indirect type-II quantum well configuration have proved to be a very promising approach in this wavelength range, with notable recent advances in interband cascade lasers. However, there remain challenges in this system in achieving excellent performance at high operating temperatures. To develop practical mid-infrared chemical sensors that operate at ambient temperatures with low power requirements, it is critically important to reduce the rate at which the lasing thresholds rise as a function of increasing temperature in these materials; at present characteristic temperatures plateau around 60 K. Recent results in optical pumping of type-II antimonide-based semiconductor lasers with W-shaped quantum wells will be presented, as will new projects employing electrically injected interband cascade lasers as well as semiconductor lasers with integrated graphene transparent contacts. These projects have a common theme designed to reveal the optoelectronic mechanisms that limit high temperature operation in antimonide-based type-II W lasers, with a particular focus on increasing the characteristic temperature of these materials and devices

Speaker Presentations

Speaker PDFs

Speaker PPTs

Download PPT