کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
739625 | 894105 | 2012 | 6 صفحه PDF | دانلود رایگان |
In this paper a novel terahertz (THz) quantum cascade laser (QCL) based on GaN/AlGaN quantum wells has been proposed, which emits at two widely separated wavelengths 33 and 52 μm simultaneously in a single active region. The large LO-phonon energy (∼90 meV), the ultrafast resonant phonon depopulation of the lower radiative levels, suppression of the electrons that escape to the continuum states and selective carrier injection and extraction all together lead to a considerable enhancement in the operating temperature of the structure. All calculations have been done at a temperature of 265 K. Moreover, similar behavior of the output optical powers is another remarkable feature, which makes both wavelengths useful for special applications.
▶ Designed terahertz dual-wavelength quantum cascade laser emits at wavelengths 33 and 52 μm. ▶ We utilize remarkable features of GaN/AlGaN material system. ▶ We improve temperature performance to 265 K by several effective techniques. ▶ Wavelengths are widely separated and have almost similar power behaviors.
Journal: Optics & Laser Technology - Volume 44, Issue 2, March 2012, Pages 378–383