High-performance midinfrared quantum cascade lasers

作     者：Capasso, Federico 

作者机构：Harvard University School of Engineering and Applied Sciences Cambridge MA 02138 United States 

出 版 物：《SPIE Reviews》 (SPIE Rev.)

年 卷 期：2010年第1卷第1期

核心收录：

主　　题：Quantum cascade lasers 

摘      要：The design and operating principles of quantum cascade lasers (QCLs) are reviewed along with recent developments in high-power cw and broadband devices. Cw power levels of several watts at room temperature have been achieved at 4.6-μm wavelength;broadband single-mode tuning (≈400 cm-1) has been achieved using an external-cavity QCL with a grating as a tuning element. An alternative approach, consisting of a monolithically integrated array of single-mode QCLs individually current-driven by a microcontroller, has led to broadband single-mode tuning over a range of 200 cm-1 without requiring the use of moving parts. This spectrometer on a chip holds promise for high-brightness compact trace-gas sensors capable of operating in harsh environments. © 2010 Society of Photo-Optical Instrumentation Engineers.