Quantum cascade disk lasers

Jerôme Faist, Claire Gmachl, Marinella Striccoli, Carlo Sirtori, Federico Capasso, Deborah L. Sivco, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


The fabrication and characterization of quantum cascade (QC) disk lasers at 5 μm wavelength is reported. The QC scheme yields several advantages for the disk geometry: an inherently transverse magnetic polarization, tailorable wavelength, and unipolar carrier transport. The low loss whispering gallery resonator allows small devices, 17-125 μm in diameter, and low threshold currents (2.85 mA for a 17 μm diameter disk) with a size independent pulsed threshold current density of 1.2 kAcm-2 at 15 K. From the threshold current density the quality factor of the disks is estimated at Q∼3500. The emission spectra show single and multiple whispering gallery modes.

Original languageEnglish (US)
Pages (from-to)2456-2458
Number of pages3
JournalApplied Physics Letters
Issue number17
StatePublished - Oct 21 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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