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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

Abstract

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

ELElectroluminescence

FTIRFourier transform infrared

FWHMFull-width-at-half-maximum

HRHigh reflection

IthThreshold current

JthThreshold current density

MBEMolecular beam epitaxy

MOVPEMetal organic vapor phase epitaxy

PHRPartial-high-reflection

PIVPower-current-voltage

QCLQuantum cascade laser

RReflectivity

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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