High Efficiency, Low Power-Consumption DFB Quantum Cascade Lasers Without Lateral RegrowthReportar como inadecuado

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Nanoscale Research Letters

, 12:281

First Online: 19 April 2017Received: 16 March 2017Accepted: 07 April 2017DOI: 10.1186-s11671-017-2064-2

Cite this article as: Jia, ZW., Wang, LJ., Zhang, JC. et al. Nanoscale Res Lett 2017 12: 281. doi:10.1186-s11671-017-2064-2


Very low power-consumption distributed feedback DFB quantum cascade lasers QCLs at the wavelength around 4.9 μm were fabricated by conventional process without lateral regrowth of InP:Fe or using sidewall grating. Benefitted from the optimized materials and low waveguide loss, very low threshold current density of 0.5 kA-cm was obtained for a device with cavity length of 2 mm. Combined with the partial-high-reflection coating, the 1-mm-long DFB QCL achieved low power-consumption continuous wave CW operation up to 105 °C. The CW threshold power-consumptions were 0.72 and 0.78 W at 15 and 25 °C, respectively. The maximum CW output power was over 110 mW at 15 °C and still more than 35 mW at 105 °C. At 15 °C, wall-plug efficiency of 5.5% and slope efficiency of 1.8 W-A were deduced, which were very high for low power-consumption DFB QCLs.

KeywordsQuantum cascade laser Distributed feedback Low power-consumption High efficiency AbbreviationsBHBuried heterostructure

CWContinuous wave

DFBDistributed feedback


FTIRFourier transform infrared


HRHigh reflection

IthThreshold current

JthThreshold current density

MBEMolecular beam epitaxy

MOVPEMetal organic vapor phase epitaxy



QCLQuantum cascade laser


SMSRSide-mode-suppression ratio

WPEWall-plug efficiency

ηsSlope efficiency

Autor: Zhi-Wei Jia - Li-Jun Wang - Jin-Chuan Zhang - Feng-Qi Liu - Yu-Hong Zhou - Dong-Bo Wang - Xue-Feng Jia - Ning Zhuo - Jun-Q

Fuente: https://link.springer.com/

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