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	Methods and apparatus for single-mode selection in quantum cascade lasers
	CAPASSO, FEDERICO; LEE, BENJAMIN, G.; PFLUGL, CHRISTIAN; DIEHL, LAURENT; BELKIN, MIKHAIL, A.
	2010-05-27
著作权人	PRESIDENT & FELLOWS OF HARVARD COLLEGE
专利号	WO2010059180A2
国家	世界知识产权组织
文献子类	发明申请
其他题名	Methods and apparatus for single-mode selection in quantum cascade lasers
英文摘要	Methods and apparatus for improved single-mode selection in a quantum cascade laser. In one example, a distributed feedback grating incorporates both index-coupling and loss-coupling components. The loss-coupling component facilitates selection of one mode from two possible emission modes by periodically incorporating a thin layer of "lossy" semiconductor material on top of the active region to introduce a sufficiently large loss difference between the two modes. The lossy layer is doped to a level sufficient to induce considerable free-carrier absorption losses for one of the two modes while allowing sufficient gain for the other of the two modes. In alternative implementations, the highly-doped layer may be replaced by other low-dimensional structures such as quantum wells, quantum wires, and quantum dots with significant engineered intraband absorption to selectively increase the free-carrier absorption losses for one of multiple possible modes so as to facilitate single-mode operation.
公开日期	2010-05-27
申请日期	2009-11-05
状态	未确认
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/66213]
专题	半导体激光器专利数据库
作者单位	PRESIDENT & FELLOWS OF HARVARD COLLEGE
推荐引用方式 GB/T 7714	CAPASSO, FEDERICO,LEE, BENJAMIN, G.,PFLUGL, CHRISTIAN,et al. Methods and apparatus for single-mode selection in quantum cascade lasers. WO2010059180A2. 2010-05-27.

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