Far-Infrared Quantum Cascade Lasers Operating in the AlAs Phonon Reststrahlen Band
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- 作者：Keita OhtaniMattias Beck ; Martin Josef Süess ; Jérôme Faist ; Aaron Maxwell Andrews ; Tobias ZederbauerHermann Detz ; Werner Schrenk ; Gottfried Strasser
- 刊名：ACS Photonics
- 出版年：2016
- 出版时间：December 21, 2016
- 年：2016
- 卷：3
- 期：12
- 页码：2280-2284
- 全文大小：570K
- ISSN：2330-4022
文摘
We report on the operation of a double metal waveguide far-infrared quantum cascade laser emitting at 28 μm, corresponding to the AlAs-like phonon reststrahlen band. To avoid absorption by AlAs-like optical phonons, the Al-free group V alloy GaAs0.51Sb0.49 is used as a barrier layer in the bound-to-continuum-based active region. Lasing occurs at a wavelength of 28.3 μm, which is the longest wavelength among the quantum cascade lasers operating from mid-infrared to far-infrared. The threshold current density at 50 K is 5.5 kA/cm2, and maximum operation temperature is 175 K. We also discuss the feasibility that the operation wavelength can cover the whole spectral range bridging between mid-infrared and terahertz by choosing properly suited group III–V materials.