Quantum cascade laser with plasmon‐enhanced waveguide operating at 8.4 μm wavelength
Quantum cascade laser with plasmon‐enhanced waveguide operating at 8.4 μm wavelength
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具有等离子体增强波导的量子级联激光器，工作波长为 8.4 μm
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
A. Cho
中科院分区：
文献类型：
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作者：
C. Sirtori;J. Faist;F. Capasso;D. Sivco;A. L. Hutchinson;A. Cho
据报道，单极级联激光器工作在 8.4 μm 波长。该结构在 AlInAs/GaInAs 材料系统中通过分子束外延生长，包含 25 级耦合量子阱有源区。通过利用接触层折射率在等离子体频率附近的色散，对波导设计进行了优化，以增强光学限制并减少与界面等离子体激元模式相关的损耗。在散热器温度为 100 K、最高工作温度为 130 K 时，峰值光功率为 30 mW，阈值电流密度为 2.8 kA/cm2。100 K 时的斜率效率为 ∼0.1 W/A，对应于每级 5.4% 的微分量子效率。这项工作与之前关于较短波长量子级联激光器的结果相结合，表明可以通过使用相同材料改变有源层的厚度来在很宽的范围内定制这些新光源的波长。
A unipolar cascade laser operating at 8.4 μm wavelength is reported. The structure, grown by molecular beam epitaxy in the AlInAs/GaInAs material system, contains a 25‐stage coupled‐quantum‐well active region. The waveguide design is optimized to enhance optical confinement and reduce losses associated with the interface plasmon mode, by taking advantage of the dispersion of the refractive index of the contact layer near the plasma frequency. The peak optical power is 30 mW and the threshold current density 2.8 kA/cm2, at a heat‐sink temperature of 100 K and the highest operating temperature is 130 K. The slope efficiency at 100 K is ∼0.1 W/A, corresponding to a differential quantum efficiency of 5.4% per stage. This work, combined with previous results on shorter wavelength quantum cascade lasers, demonstrates that the wavelength of these new light sources can be tailored over a wide range by changing the active layers’ thicknesses using the same materials.