工作在AlAs声子Reststrahlen带的远红外量子级联激光器
Far-infrared quantum cascade lasers operating in AlAs phonon Reststrahlen band
摘要：
我们报告的操作的双金属波导远红外量子级联激光器发射在28 $μ$ m，对应于AlAs类声子Reststrahlen带。为了避免被类AlAs光学声子吸收，在基于结合到连续体的有源区中使用无Al的V族合金GaAs $_{0.51}$ Sb $_{0.49}$作为阻挡层。激光发生在28.3 $μ$ m的波长处，这是从中红外到远红外操作的量子级联激光器中最长的波长。在50 K时阈值电流密度为5.5 kA/cm $^{2}$，最高工作温度为175 K。通过选择合适的III-V族材料，讨论了工作波长覆盖中红外和太赫兹波段的可行性。
英文摘要：
We report on the operation of a double metal waveguide far-infrared quantum cascade laser emitting at 28 $μ$m, corresponding to the AlAs-like phonon Reststrahlen band. To avoid absorption by AlAs-like optical phonons, the Al-free group-V alloy GaAs$_{0.51}$Sb$_{0.49}$ is used as a barrier layer in the bound-to-continuum based active region. Lasing occurs at a wavelength of 28.3 $μ$m, 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/cm$^{2}$ and maximum operation temperature is 175 K. We also discuss the feasibility that operation wavelength cover the whole spectral range bridging between mid-infrared and terahertz by choosing suited group III-V materials.
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