RT info:eu-repo/semantics/article
T1 Thermomechanical issues of high power laser diode catastrophic optical damage
A1 Souto Bartolomé, Jorge Manuel
A1 Pura Ruiz, José Luis
A1 Jiménez López, Juan Ignacio
AB Catastrophic optical damage (COD) of high power laser diodes is a crucial factor limitingultra high power lasers. The understanding of the COD process is essential to improve theendurance of the high power laser diodes. COD is observed as a process in which the activepart of the laser diode is destroyed, forming characteristic defects, the so called dark linedefects (DLDs). The DLDs are formed by arrays of dislocations generated during the laseroperation. Local heating associated with non-radiative recombination is assumed to be at theorigin of the COD process. A summary of the methods used to assess the COD, both in realtime and post-mortem is presented. The main approaches developed in recent years to modelthe heat transport in the laser structures under non homogeneous temperature distribution areoverviewed. Special emphasis is paid to the impact of the low dimensionality of QWs in twophysical properties playing a major role in the COD process, namely, thermal conductivityand mechanical strength. A discussion about the impact of the nanoscale in both physicalproperties is presented. Finally, we summarize the main issues of the thermomechanicalmodelling of COD. Within this model the COD is launched when the local thermal stressesgenerated around the heat source overcome the yield stress of the active zone of the laser. Thethermal runaway is related to the sharp decrease of the thermal conductivity once the onset ofplasticity has been reached in the active zone of the laser.
PB IOP Science
SN 0022-3727
YR 2019
FD 2019
LK http://uvadoc.uva.es/handle/10324/38034
UL http://uvadoc.uva.es/handle/10324/38034
LA eng
NO Journal of Physics D: Applied Physics 52, 343002 (2019)
DS UVaDOC
RD 24-nov-2024