scholarly journals Investigation of the effects of nonlinear optical gain and thermal carrier excitation on characteristics of self-assembled quantum-dot lasers

2012 ◽  
Vol 20 (14) ◽  
pp. 14754 ◽  
Author(s):  
Davoud Ghodsi Nahri
Keyword(s):  
Quantum Dot ◽  
Nonlinear Optical ◽  
Optical Gain ◽  
Quantum Dot Lasers ◽  
Self Assembled

Evaluating the effects of nonlinear optical gain and thermal carrier escape on the performance of InGaAs/GaAs self-assembled quantum dot lasers

2016 ◽  
Vol 30 (19) ◽  
pp. 1650121
Author(s):  
M. Kashiri ◽  
A. Asgari
Keyword(s):  
Quantum Dot ◽  
Output Power ◽  
Nonlinear Optical ◽  
Model Comparison ◽  
Maximum Output Power ◽  
Optical Gain ◽  
Maximum Output ◽  
Lasing Spectrum ◽  
Self Assembled ◽  
Carrier Escape

The present paper reports the effects of nonlinear optical gain and thermal carrier escape on light-current characteristics in self-assembled quantum dot (QD) lasers based on a rate equation model. Comparison of the obtained simulated results with empirical findings showed that it is necessary to consider the effects of thermal carrier escape and nonlinear optical gain in order to evaluate dynamic and static characteristics of self-assembled QD lasers. Moreover, it was revealed that the describing terms of the thermal carrier escape from QDs is not enough in order to describe the effects of temperature on dynamics of carrier escape. Also, it was found that rate of (thermal) carriers stimulation depends directly on the inhomogeneous broadening (IHB). In other words, changes of IHB effects on the dynamics of thermal carrier changes. In addition, the results showed that optimized amount of homogenous broadening (HB) in which the maximum emission occurs in the central mode depended on both IHB and temperature. Comparing two conditions of linear and total optical gain illustrated that output power decreases if linear gain is replaced by total gain; also, lasing emissions broadens and number of lasing modes increases by increase in current. Investigating the effect of carrier’s relaxation lifetime on output power showed that increase of relaxation lifetime increases the threshold current and decreases the output power and slope efficiency. Furthermore, increase in relaxation lifetime caused decline in maximum output power and broadening of lasing spectrum.

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