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Optical Engineering • Open Access

High-performance midinfrared quantum cascade lasers
Author(s): Federico Capasso

Paper Abstract

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.

Paper Details

Date Published: 1 November 2010
PDF: 9 pages
Opt. Eng. 49(11) 111102 doi: 10.1117/1.3505844
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
Federico Capasso, Harvard Univ. (United States)

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