We have determined the shear stress associated with the temperature gradient in quantum cascade lasers operated in continuous-wave mode. This information was obtained as a function of the electrical power using a combination of microprobe photoluminescence and anti-Stokes/Stokes Raman measurements in ridge-waveguide GaAs structures mounted epilayer down to the heat sink. At electrical power densities in the order of similar to5 kW/cm(2), the strain in the cladding layers at the edges of the laser ridges reaches the critical value for the creation of misfit dislocations. Above 10-12 kW/cm(2), extended defect formation and eventual device failure are observed.

Thermoelastic stress in GaAs/AlGaAs quantum cascade lasers

Spagnolo, V.;
2003

Abstract

We have determined the shear stress associated with the temperature gradient in quantum cascade lasers operated in continuous-wave mode. This information was obtained as a function of the electrical power using a combination of microprobe photoluminescence and anti-Stokes/Stokes Raman measurements in ridge-waveguide GaAs structures mounted epilayer down to the heat sink. At electrical power densities in the order of similar to5 kW/cm(2), the strain in the cladding layers at the edges of the laser ridges reaches the critical value for the creation of misfit dislocations. Above 10-12 kW/cm(2), extended defect formation and eventual device failure are observed.
File in questo prodotto:
File Dimensione Formato  
23-APL_GaAs_strain_03.pdf

accesso aperto

Tipologia: Versione editoriale
Licenza: Tutti i diritti riservati
Dimensione 177.51 kB
Formato Adobe PDF
177.51 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11589/10466
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 15
social impact