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Proceedings Paper

Low-threshold current short-cavity quantum cascade lasers
Author(s): Xing Chen; Liwei Cheng; Dingkai Guo; Fow-Sen Choa; Terry Worchesky; Jiun-Yun Li
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Paper 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.

Paper Details

Date Published: 22 September 2010
PDF: 7 pages
Proc. SPIE 7750, Photonics North 2010, 775011 (22 September 2010); doi: 10.1117/12.873030
Show Author Affiliations
Xing Chen, Univ. of Maryland, Baltimore County (United States)
Liwei Cheng, Univ. of Maryland, Baltimore County (United States)
Dingkai Guo, Univ. of Maryland, Baltimore County (United States)
Fow-Sen Choa, Univ. of Maryland, Baltimore County (United States)
Terry Worchesky, Univ. of Maryland, Baltimore County (United States)
Jiun-Yun Li, Princeton Univ. (United States)


Published in SPIE Proceedings Vol. 7750:
Photonics North 2010
Henry P. Schriemer; Rafael N. Kleiman, Editor(s)

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