Bahriz M, Lollia G, Baranov A N, Teissier R
Opt Express. 2015 Jan 26;23(2):1523-8. doi: 10.1364/OE.23.001523.
We demonstrate the high temperature operation, up to 80°C, of quantum cascade lasers emitting at a wavelength of 20 µm. The lasers are based on the InAs/AlSb materials and take benefit of a low loss plasmon-enhanced dielectric waveguide. The waveguide consists of doped InAs cladding layers and low-doped InAs spacers. For 2.9-mm-long devices, the threshold current density is 4.3 kA/cm and the measured peak output power is 7 mW at room temperature. The cavity length dependence of the threshold currents also indicates that very large optical gain is achieved and effectively overcome the strong free carrier absorption.
我们展示了发射波长为20微米的量子级联激光器在高达80°C的高温下运行。这些激光器基于InAs/AlSb材料，并利用了低损耗等离子体增强介质波导。该波导由掺杂的InAs包层和低掺杂的InAs间隔层组成。对于长度为2.9毫米的器件，室温下的阈值电流密度为4.3 kA/cm，测量得到的峰值输出功率为7 mW。阈值电流对腔长的依赖性还表明，实现了非常大的光学增益，并有效克服了强烈的自由载流子吸收。
