Thermal Analysis for Quantum Cascade Lasers using Experiments, Simulations and Structure Function Obtained by Static Measurement

Takagi, Shigeyuki; Tanimura, Hirotaka; Kakuno, Tsutomu; Hashimoto, Ryota; Saito, Shinji

doi:10.5220/0007612903030307

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2021

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“…The heat dissipation plays a critical role in the device performance of mid-IR QCLs. Among the methods used to reduce the laser overheating are the optimization of the laser active region and waveguide design, the processing technology, mounting and device packaging [ 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

In-Depth Experimental Analysis of Influence of Electroplated Gold Thickness on Thermal and Electro-Optical Properties of mid-IR AlInAs/InGaAs/InP Quantum Cascade Lasers

Pierścińska¹,

Pierściński²,

Sobczak³

et al. 2021

Materials

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In this paper, we have examined the influence of electroplated gold thickness on the thermal and electro-optical properties of mid-IR AlInAs/InGaAs, InP QCLs. The experimental results show a significant reduction of the temperature of QCL active region (AR) with increasing gold layer thickness. For QCLs with 5.0 μm gold thickness, we observed a 50% reduction of the active region temperature. An improvement of key electro-optical parameters, that is, threshold current density and maximum emitted power for structures with thick gold, was observed. The results of micro-Raman characterization show that the electroplated gold layer introduces only moderate compressive strain in top InP cladding, which is well below the critical value for the creation of misfit dislocations.

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