Nanoscale effects on the thermal and mechanical properties of AlGaAs/GaAs quantum well laser diodes: influence on the catastrophic optical damage

Souto, J.; Pura, José Luis; Jiménez, J.

doi:10.1088/1361-6463/aa6fbd

Cited by 12 publications

(9 citation statements)

References 59 publications

(98 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That would correspond to a shift of the bulk curve towards higher stresses. For the type of structures here considered, we estimated that the onset for plastic deformation approximately corresponds to a peak temperature of 600K [6,7]. For a SQW laser, that temperature is reached for absorbed laser powers of about 8 MW/cm 2 , according to Figure 5.…”

Section: Thermal Stressesmentioning

confidence: 87%

See 1 more Smart Citation

Thermomechanical degradation of single and multiple quantum well AlGaAs/GaAs laser diodes

Souto

Pura

Torres

et al. 2017

Microelectronics Reliability

View full text Add to dashboard Cite

The catastrophic degradation of laser diodes with active zones comprising either single (SQW) or multiple quantum wells (MQW) has been analysed via finite element methods. This analysis is based on a physical model that explicitly considers the thermal and mechanical properties of the diode laser structure and the relevant size effects associated with the small thickness of the active layers of the device. The reduced thermal conductivities and the thermal barriers at the interfaces result in a significant local heating process which is accentuated as more quantum wells form the active part of the device. Therefore, in the design of high power devices, the SQW configuration would be more appropriate than the MQW alternative.

show abstract

Section: Thermal Stressesmentioning

confidence: 87%

“…In previous papers [6,7] we have modelled the catastrophic degradation of a SQW laser diode by means of a thermomechanical model in which the local heating is responsible for laser self-absorption and subsequent mechanical failure. This process leads to large temperature gradients that give rise to relevant thermal stresses.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical degradation of single and multiple quantum well AlGaAs/GaAs laser diodes

Souto

Pura

Torres

et al. 2017

Microelectronics Reliability

View full text Add to dashboard Cite

show abstract

“…Finally, while consistent data concerning the thermal conductivity of the laser structure are available, more effort is necessary to understand the mechanical behaviour of the QWs, in order to ascertain their resistance to plastic deformation and how they behave when they are exposed to an internal source of stress. The symbols correspond to the data for κbulk/κeff = 0.34 and for power densities from 2 to 14 MW cm −2 with a 2 MW cm −2 step size, evaluated either in the QW (circles) or at the QW-guide interfaces (triangles) [124]. Figure 13.…”

Section: Discussionmentioning

confidence: 99%

“…The fact that the model was adequate for a DH device with a 200 nm thick GaAs active layer, but not for the 12 nm thick QW, was an indication that our approach was not fully correct. As the size-dependent thermal conductivity effects had already been considered, the enhancement of the mechanical strength and the corresponding displacement of the onset of plasticity for the thinnest layers were brought into the scheme [124]. In want for more detailed experimental studies, the available yield strength data for low dimensional structures [104,107] were extrapolated in order to simulate the mechanical behaviour of the guide layers and the QW.…”

Section: The Incidence Of Nanoscale Effects On Codmentioning

confidence: 99%

Thermomechanical issues of high power laser diode catastrophic optical damage

Souto

Pura

Jiménez

2019

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

Catastrophic optical degradation (COD) of high power laser diodes is a crucial factor limiting ultra high power lasers. The understanding of the COD process is essential to improve the endurance of the high power laser diodes. The COD is observed as a process in which the active part of the laser diode is destroyed, forming characteristic defects, the so called dark line defects (DLDs). The DLDs are formed by arrays of dislocations generated during the laser operation. Local heating associated with non-radiative recombination is assumed to be at the origin of the COD process. A summary of the methods used to assess the COD, both in real time and post-mortem is presented. The main approaches developed in the last years to model the heat transport in the laser structures under non homogeneous temperature distribution are overviewed. Special emphasis is paid to the impact of the low dimensionality of QWs in two physical properties playing a major role in the COD process, namely, thermal conductivity and mechanical strength. A discussion about the impact of the nanoscale in both physical properties is presented. Finally, we summarize the main issues of the thermomechanical modelling of COD. Within this model the COD is launched when the local thermal stresses generated around the heat source overcome the yield stress of the active zone of the laser. The thermal runaway is related to the sharp decrease of the thermal conductivity once the onset of plasticity has been reached in the active zone of the laser.

show abstract

“…Finally, the evolution of the laser structure, associated with the formation of defects, during the laser operation produces changes in the materials and therefore their properties evolve as well; in particular, the thermal conductivity decreases with the presence of defects [9], and one can claim it as the factor producing the thermal runaway associated with the COD [10]. All these aspects are studied herein on the bases of a thermomechanical model for the COD of high power laser diodes based on GaAs related compounds [6,10]. Also, one discuss about the role of the QW and the guide layers in the end of life of the laser.…”

Section: Introductionmentioning

confidence: 99%

Materials issues for the catastrophic degradation of high power laser diodes

Souto¹,

Pura²,

Jiménez³

2017

2017 IEEE High Power Diode Lasers and Systems Conference (HPD)

View full text Add to dashboard Cite

In this work we investigate the catastrophic optical damage (COD) of GaAS based quantum well (QW) laser diodes under the optics of the role played by the physical properties of the materials forming the active parts of the lasers in the degradation process, taking account of their nanoscale dimensionality. High power laser diodes under operation can experiment local heating phenomena that lead to device failure. A thermo-mechanical model has been set up to study the mechanism of degradation. The incidence of the local heating in the degradation is tightly related to the physical properties of the active region of the laser; in particular, the thermal conductivity, the optical absorption, the thermal expansion coefficients, and the mechanical strength, play a crucial role in the degradation process. Furthermore, the low dimensionality of the layers has a strong influence on those properties.

show abstract

Nanoscale effects on the thermal and mechanical properties of AlGaAs/GaAs quantum well laser diodes: influence on the catastrophic optical damage

Abstract: An experimental and theoretical analysis of the temperature profile in semiconductor laser diodes using the photodeflection technique

Cited by 12 publications

References 59 publications

Thermomechanical degradation of single and multiple quantum well AlGaAs/GaAs laser diodes

Thermomechanical degradation of single and multiple quantum well AlGaAs/GaAs laser diodes

Thermomechanical issues of high power laser diode catastrophic optical damage

Materials issues for the catastrophic degradation of high power laser diodes

Contact Info

Product

Resources

About