Thermal properties and degradation behavior of red-emitting high-power diode lasers

Tien, Tran Quoc; Weik, F.; Tomm, Jens W.; Sumpf, B.; Zorn, M.; Zeimer, U.; Erbert, G.

doi:10.1063/1.2374693

Cited by 17 publications

(12 citation statements)

References 10 publications

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“…Absorption of laser light at these defects progressively increases the value of T facet . Thus, even for a constant power level T facet rises continuously [20,77] and the thermal runaway starts at T facet = T crit .…”

Section: Cod Threshold In Cw Operationmentioning

confidence: 99%

“…1d). In other cases, even careful SEM inspection does not reveal any surface alteration [77], whereas electroluminescence patterns reveal darkened areas not far behind the seemingly unaffected facet. If COD signatures are visible at the facet, there is typically a correlation between P COD and the observed surface damage, i. e., the higher P COD the more extended the damage pattern at the facet [86,87].…”

Section: Failure Analysis Of Devices Affected By Codmentioning

confidence: 99%

“…For this purpose, the devices are opened mechanically by removing the p-or n-contact metallizations and -in p-down packaged geometries -the substrate. PL or CL maps are taken Figure 5 (a) CL map of the QW emission from an emitter stripe of a BA laser, which failed by front facet COD during cw operation according to [77]. The inset depicts the geometry of the propagation of the dark bands along the cavity.…”

Section: Failure Analysis Of Devices Affected By Codmentioning

confidence: 99%

“…The occurrence of dark bands is considered an experimental proof for COD as an active failure mechanism. Figure 5a shows a typical CL map of the QW emission from an emitter stripe of a BA laser which failed by front facet COD during cw operation [77]. The inset depicts the geometry of the damage within the cavity.…”

Section: Failure Analysis Of Devices Affected By Codmentioning

confidence: 99%

“…ual degradation (i. e., before COD) has been monitored [77]. A comparison of facet temperatures of QW and quantumdot lasers of similar design indicated a lower T facet -value for the quantum-dot devices [113].…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Mechanisms and fast kinetics of the catastrophic optical damage (COD) in GaAs‐based diode lasers

Tomm

Ziegler

Hempel

et al. 2011

Laser & Photonics Reviews

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Semiconductor lasers are the most efficient manmade narrow-band light sources and convert up to threequarters of electric energy into light. High-power diode lasers are characterized by very high internal power densities in their small cavity, resulting in local heating and sometimes device degradation. Catastrophic optical damage (COD) of diode lasers is a relevant degradation mechanism and limit for reaching ultrahigh optical powers. An overview is given on research activities targeting the mechanisms being relevant for the COD process in GaAs-based diode lasers emitting in the 630-1100 nm range. The discussion of experiments, where COD is artificially provoked, represents the main topic. The sequence of events and fast kinetics taking place on a nanosecond to microsecond time scale are addressed. A particular emphasis is laid on recent experimental work performed in the authors' laboratories. Paving the way for knowledge-based solutions towards more robust diode lasers represents the ultimate goal of this work. COD diagram determined for a batch of broad-area AlGaAs diode lasers. The time to COD within a single current pulse is plotted versus the actual average optical power in the moment when the COD takes place. Full circles stand for clearly identified COD events (right ordinate), whereas open circles (left ordinate) represent the pulse duration in experiments, where no COD has been detected. A borderline (gray) exists between two regions, i. e., parameter sets, of presence (orange) and absence of COD (blue). This borderline is somewhat blurred because of the randomness in filamentation of the laser nearfield and scatter in properties of the involved individual devices.

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Section: Cod Threshold In Cw Operationmentioning

confidence: 99%