Thermally controlled onset of spatially incoherent emission in a broad-area vertical-cavity surface-emitting laser

Gordon Craggs, Guy Verschaffelt, Shyam K. Mandre, Hugo Thienpont, Ingo Fischer

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We present an experimental study of the physical process that leads to spatially incoherent, nonmodal emission in broad-area vertical-cavity surface-emitting lasers. We show that this special emission regime that occurs in pulsed operation of these lasers is due to a combination of a spatially distributed thermal or refractive index gradient (thermal lens) and thermal expansion of the cavity during the pulse (thermal chirp). Our measurements are based on preinstalling a thermal lens through a current bias, and subsequently, modulating a pulse onto the bias. This approach allows us to independently investigate the role of both thermal effects in the onset of nonmodal emission. © 2006 IEEE.

Original languageEnglish
Article number4838878
Pages (from-to)555-562
Number of pages8
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume15
Issue number3
DOIs
Publication statusPublished - May 2009

Keywords

  • Semiconductor laser
  • Spatial coherence
  • Thermal effects
  • Vertical-cavity surface-emitting laser (VCSEL)

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