Low-threshold current short-cavity quantum cascade lasers

Xing Chen; Liwei Cheng; Dingkai Guo; Fow-Sen Choa; Terry Worchesky; Jiun-Yun Li

doi:10.1117/12.873030

22 September 2010 Low-threshold current short-cavity quantum cascade lasers

Xing Chen, Liwei Cheng, Dingkai Guo, Fow-Sen Choa, Terry Worchesky, Jiun-Yun Li

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.

Citation Download Citation

Xing Chen, Liwei Cheng, Dingkai Guo, Fow-Sen Choa, Terry Worchesky, and Jiun-Yun Li "Low-threshold current short-cavity quantum cascade lasers", Proc. SPIE 7750, Photonics North 2010, 775011 (22 September 2010); https://doi.org/10.1117/12.873030

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