| 报告题目 | Interband Cascade Lasers, Relevant Devices, and Their Applications |
| 报告人 | Dr. Rui Q. Yang |
| 报告人单位 | School of Electrical and Computer Engineering, University of Oklahoma (OU), Norman, OK |
| 报告时间 | 2012-11-15 |
| 报告地点 | 合肥微尺度物质科学国家实验室9004会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | 报告摘要：
Interband cascade (IC) lasers take advantage of the broken band-gap alignment in type-II quantum wells to reuse injected electrons in cascade stages for photon generation with high quantum efficiency and represent a relatively new class of mid-infrared light sources. Unlike intraband quantum cascade lasers, IC lasers use interband (conduction to valence bands) transitions for photon emission without involving fast phonon scattering, making it possible to significantly lower the threshold current density. IC lasers are designed entirely based on quantum mechanics and grown by advanced technology such as molecular beam epitaxy (MBE). Since the proposal of IC lasers in 1994, significant progress has been achieved toward high-performance mid-IR laser devices. Some outstanding performance features such as low threshold current densities (e.g. <2 A/cm2 at 80 K, <200 A/cm2 at 300 K) and low power consumption (e.g. <0.1 W in cw operation at room temperature) partially verified the advantages of IC lasers. Single-mode distributed feedback (DFB) IC lasers have been demonstrated in the wavelength range from ~3 to 4 μm. These DFB IC lasers have been employed for the detection of gases such as methane (CH4), Ethane (C2H6), hydrogen chloride (HCl), and formaldehyde (H2CO), and have been flown on aircraft and high-altitude balloon instruments and measured atmospheric CH4 and HCl profiles. One IC laser is currently working in a flight instrument aboard NASA’s Curiosity rover (火星车好奇号), which landed on Mars in August 2012. Recently, we have extended the efficient IC lasers into the longer wavelength region (>10 m) based on plasmon waveguides. In this talk, the development of IC lasers from concept to devices will be reviewed. Also, using IC structures for other devices such as IR photodetectors and photovoltaic cells will be discussed with our recent experimental results.
报告人简介：
Dr. Yang received the B.Sc. degree in physics from Zhejiang University in 1982, and the M.Sc. and Ph.D. degrees in physics from Nanjing University in 1984 and 1987, respectively. He is the inventor of interband cascade lasers with research activities ranging from condensed matter physics to semiconductor quantum devices such as tunneling diodes, mid-infrared lasers and detectors, as well as photovoltaic devices for converting light to electricity. Prior to joining OU as a professor in 2007, he was a Principal Member of Engineering Staff and a Task Manager at the Jet Propulsion Laboratory (JPL) in California, where he led the development of advanced mid-IR IC lasers for applications in Earth sciences and planetary explorations. He received the Edward Stone Award in 2007 from JPL for outstanding research publication and the successful accelerated infusion of cutting-edge interband cascade semiconductor laser technology into flight mission readiness. He has authored/co-authored more than 100 refereed journal articles and two book chapters with 4 patents and over 100 conference contributions, invited seminars, and talks. He has been the principal investigator on many tasks and contracts from NASA, DoD, DoE funding agencies, and NSF. |
