scholarly journals 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

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7352
Author(s):  
Dorota Pierścińska ◽  
Kamil Pierściński ◽  
Grzegorz Sobczak ◽  
Katarzyna Krajewska ◽  
Krzysztof Chmielewski ◽  
...  
Keyword(s):  
Optical Properties ◽  
Active Region ◽  
Quantum Cascade Lasers ◽  
Compressive Strain ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Gold Layer ◽  
Optical Parameters ◽  
Misfit Dislocations ◽  
Gold Thickness

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.

Quantum Cascade Lasers

2020 ◽  
pp. 491-526
Author(s):  
Vurgaftman Igor
Keyword(s):  
Quantum Cascade Lasers ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Interface Roughness ◽  
Frequency Combs ◽  
Quantum Cascade ◽  
Wall Plug Efficiency ◽  
Interface Roughness Scattering ◽  
Cascade Lasers ◽  
Considerable Detail

This chapter describes the most commonly used approaches for computing the band structure of active materials with intersubband optical transitions. The physics of quantum cascade lasers (QCLs) is discussed in detail, including the mechanisms that limit the threshold current density, threshold voltage, wall-plug efficiency, and temperature sensitivity of state-of-the-art devices. The important roles of phonon and interface roughness scattering in determining threshold are emphasized. The chapter also compares the performance of QCLs to other mid-IR lasers in considerable detail and makes some conclusions as to which sources are preferred depending on the emission wavelength and application. Finally, the physical principles of laser-based frequency combs, including self-starting frequency-modulated QCL combs, are discussed.

scholarly journals Green laser diodes with low threshold current density via interface engineering of InGaN/GaN quantum well active region

2017 ◽  
Vol 25 (1) ◽  
pp. 415 ◽  
Author(s):  
Aiqin Tian ◽  
Jianping Liu ◽  
Liqun Zhang ◽  
ZengCheng Li ◽  
Masao Ikeda ◽  
...  
Keyword(s):  
Active Region ◽  
Quantum Well ◽  
Current Density ◽  
Laser Diodes ◽  
Threshold Current ◽  
Green Laser ◽  
Threshold Current Density ◽  
Interface Engineering ◽  
Low Threshold

Low threshold current density distributed feedback quantum cascade lasers with deep top gratings

2006 ◽  
Vol 89 (16) ◽  
pp. 161102 ◽  
Author(s):  
Gangyi Xu ◽  
Aizhen Li ◽  
Yaoyao Li ◽  
Lin Wei ◽  
Yonggang Zhang ◽  
...  
Keyword(s):  
Current Density ◽  
Quantum Cascade Lasers ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Distributed Feedback ◽  
Quantum Cascade ◽  
Low Threshold ◽  
Cascade Lasers
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