Mechanisms driving the catastrophic optical damage in high-power laser diodes

Souto, J.; Pura, José Luis; Rodriguez, Mario; Anaya, J.; Torres, A.; Jiménez, J.

doi:10.1117/12.2079464

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…The problem was first tackled allowing for non-ideal guide-QW interfaces, and, correspondingly, thermal boundary resistances (TBR) were considered [122]. A different and more versatile approach based on effective thermal conductivities [90,123] was finally adopted [40,124]. In any case, the poorer heat dissipation due to the TBRs or reduced thermal conductivities gave rise to sharper temperature gradients and higher stresses around the heat source.…”

Section: The Incidence Of Nanoscale Effects On Catastrophic Optical D...mentioning

confidence: 99%

Thermomechanical issues of high power laser diode catastrophic optical damage

Souto

Pura

Jiménez

2019

J. Phys. D: Appl. Phys.

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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.

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Section: The Incidence Of Nanoscale Effects On Catastrophic Optical D...mentioning

confidence: 99%

Thermomechanical issues of high power laser diode catastrophic optical damage

Souto

Pura

Jiménez

2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The temperature rises sharply up to about 12 nm and very slightly for higher values. Experimental evidence indicates that the depth of the degradation in samples that have gone through COD considerably exceeds the thickness of the QW [6]. Thus, when studying degrading devices the reduced conductivity ratios have been adopted for the whole of the QW layer.…”

Section: Facet Degradationmentioning

confidence: 99%

“…On the basis of these scenarios, physical models have to be built up in order to delimit the clues of the degradation with the aim of establishing causality. In previous articles, we have identified the main defects generated during the laser operation that lead to the failure [4][5][6]. This analysis was carried out by electron beam excited techniques, e.g.…”

Section: Introductionmentioning

confidence: 99%