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| 1 | 太赫兹量子级联激光器研究进展显示文摘量子级联激光器(QCL)是一种基于多量子阱子带间跃迁的单极性半导体激光器,激射频率位于中远红外以及太赫兹(THz)波段。在1~5 THz激射频率范围内,THz QCL是最有效的电泵浦THz辐射源,具有结构紧凑、易集成、输出功率高和转换效率高等优点。本文首先对THz QCL的有源区结构、波导结构以及材料体系进行了简介,然后从有源区方面对极限激射频率、高工作温度、大输出功率等高性能THz QCL进行了梳理,接着从波导结构方面对一维光栅、二维光子结构、超表面结构等THz QCL光子工程研究进展进行了综述。另外对主动稳频THz光频梳、被动稳频THz光频梳、THz双光梳等THz QCL光频梳方面的最新研究成果进行了介绍。 | 万文坚 黎华 曹俊诚 | 2020 | 中国激光2020，47，7： | 5 |
| 2 | Highly efficient surface-emitting semiconductor lasers exploiting quasi-crystalline distributed feedback photonic patterns显示文摘Quasi-crystal distributed feedback lasers do not require any form of mirror cavity to amplify and extract radiation.Once implemented on the top surface of a semiconductor laser,a quasi-crystal pattern can be used to tune both the radiation feedback and the extraction of highly radiative and high-quality-factor optical modes that do not have a defined symmetric or anti-symmetric nature.Therefore,this methodology offers the possibility to achieve efficient emission,combined with tailored spectra and controlled beam divergence.Here,we apply this concept to a onedimensional quantum cascade wire laser.By lithographically patterning a series of air slits with different widths,following the Octonacci sequence,on the top metal layer of a double-metal quantum cascade laser operating at THz frequencies,we can vary the emission from single-frequency-mode to multimode over a 530-GHz bandwidth,achieving a maximum peak optical power of 240mW(190 mW)in multimode(single-frequency-mode)lasers,with record slope efficiencies for multimode surface-emitting disordered THz lasers up to ≈570 mW/A at 78 K and ≈720 mW/A at 20 K and wall-plug efficiencies of η≈1%. | Simone Biasco Andrea Ciavatti Lianhe Li AGiles Davies Edmund H.Linfield Harvey Beere David Ritchie Miriam S.Vitiello | 2020 | Light(Science & Applications)2020，9，1： | 0 |
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