Extended tunability in a two-chip VECSEL

Li Fan, Mahmoud Fallahi, Aramais R. Zakharian, Jörg Hader, Jerome V. Moloney, Robert Bedford, James T. Murray, Wolfgang Stolz, Stephan W. Koch

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


We demonstrate a widely tunable vertical-external-cavity surface-emitting laser (VECSEL) with a W-shaped cavity, in which two VECSEL chips serve as fold mirrors and a birefringent filter is inserted at Brewster's angle. These two chips provide much higher modal gain and broader bandwidth of the gain than a single chip does, enhancing the VECSEL tuning range and reducing the variation of tunable output power with the tuned wavelength. This two-chip VECSEL configuration makes it possible to shape the modal gain spectra of the laser or to manipulate the tuning curve of the laser by two different chips with certain gain peak detuning (offset). Multiwatts high-brightness linearly polarized output with a tuning range of 33 nm is demonstrated in such a two-chip VECSEL.

Original languageEnglish (US)
Pages (from-to)544-546
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number8
StatePublished - Apr 15 2007


  • Birefringent filter (BF)
  • Optically pumped semiconductor laser
  • Tunable linearly polarized vertical-external-cavity surface-emitting laser (VECSEL)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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