22 September 2010 Low-threshold current short-cavity quantum cascade lasers
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Proceedings Volume 7750, Photonics North 2010; 775011 (2010) https://doi.org/10.1117/12.873030
Event: Photonics North 2010, 2010, Niagara Falls, Canada
Abstract
We report in this paper the study of achieving low current threshold quantum cascade lasers (QCLs) by using highreflection (HR) coating to short-cavity QCLs. Experimental results show that the QCL current threshold (Ith) and injecting electrical power are significantly decreased with HR coatings applied to one side or both sides of a QCL. The QCL structures used in the experiment are strain balanced InGaAs/InAlAs supperlattices based on InP substrate with the emission wavelength at λ~4.8μm. QCL devices with 28 periods and 60 periods are studied. With HR coatings on both laser facets, a 28 periods QCL device cleaved with 1mm long cavity expresses a low current threshold of 70mA at cryogenic temperature and a 0.5mm long cavity device shows a current threshold of 65mA at 50K. A 0.5mm long 60 periods QCL device with both sides HR coated is found to have a current threshold as low as 30mA at 20K and still below 50mA at liquid Nitrogen cooled temperature.
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Xing Chen, Xing Chen, Liwei Cheng, Liwei Cheng, Dingkai Guo, Dingkai Guo, Fow-Sen Choa, Fow-Sen Choa, Terry Worchesky, Terry Worchesky, Jiun-Yun Li, Jiun-Yun Li, } "Low-threshold current short-cavity quantum cascade lasers", Proc. SPIE 7750, Photonics North 2010, 775011 (22 September 2010); doi: 10.1117/12.873030; https://doi.org/10.1117/12.873030
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