Degradation mechanisms in high-power multi-mode InGaAs-AlGaAs strained quantum well lasers for high-reliability applications

Sin, Yongkun; Presser, Nathan; Brodie, Miles; Lingley, Zachary; Foran, Brendan; Moss, Steven C.

doi:10.1117/12.2076788

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…The initial stages of the degradation of LDs have been rationalized [8,[41][42][43] in terms of non-radiative recombination, either surface recombination at the facet or at point defects inside the QW. The last decades view a persistent improvement of the laser structures.…”

Section: Discussionmentioning

confidence: 99%

“…However, the concentration of these defects steadily grows as a result of the laser operation, and this increase would be responsible for the initially very slow drop in optical power of the device. The need for new experimental techniques to adequately monitor this progressive degradation has been brought forth [42].…”

Section: Discussionmentioning

confidence: 99%

“…This density might be locally reached, however, if self-focusing of the laser light is induced by thermal lensing effects [42]. Alternatively, the question whether the initial thermal conductivity ratio here chosen is too conservative should be brought forth.…”

Section: Discussionmentioning

confidence: 99%

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

Souto¹,

Pura²,

Jiménez³

2017

J. Phys. D: Appl. Phys.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

Souto¹,

Pura²,

Jiménez³

2017

J. Phys. D: Appl. Phys.

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“…In the initial operational stages of the device, the temperature increases as a result of local power fluctuations whereas the thermal conductivity remains basically unaltered. Over an extended period of cw operation, the characteristics of the laser slowly deteriorate due to a progressive accumulation of point defects, as well as to other effects such as thermal lensing [20] or current-crowding [21]. All of these mechanisms result in locally enhanced power absorption levels.…”

Section: Methodsmentioning

confidence: 99%

Thermal and mechanical issues of high-power laser diode degradation

Souto¹,

Pura²,

Jiménez³

2018

MRS Communications

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“…According to Sin and co-workers, the degradation process involves a gradually increasing concentration of point defects. As the numbers of non-radiative recombination centres grows so does the generated heat in the hot spot, until COD is set-up [33]. Attempts to detect a precursor signature for COD were undertaken, and though the tests could be stopped for a few specimens before they showed a significant drop in the optical power output, no clear signs of extended defects were observed [29].…”

Section: Real-time Analysismentioning

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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Degradation mechanisms in high-power multi-mode InGaAs-AlGaAs strained quantum well lasers for high-reliability applications

Cited by 5 publications

References 7 publications

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

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

Thermal and mechanical issues of high-power laser diode degradation

Thermomechanical issues of high power laser diode catastrophic optical damage

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