Threshold current reduction and directional emission of deformed microdisk lasers via spatially selective electrical pumping

Nyan L. Aung, Li Ge, Omer Malik, Hakan Engin Tureci, Claire F. Gmachl

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We report on laser threshold current reduction and directional emission from quadrupole-shaped AlGaInAs microdisk diode lasers by selective electrical pumping. The directional emission results from breaking the 2-fold rotation symmetry of the system by the introduction of a triangle-shaped contact geometry, and the laser threshold reduction results from a small current injection area. Room temperature laser operation is achieved in both pulsed and continuous-wave operation for a microdisk radius of 50 μm and deformation constant of ε = 0.09, with optical output power of more than 8 mW and 3 mW, respectively. Under pulsed operation, the minimum measured threshold current for selectively pumped microlasers is 42 mA, significantly lower than the minimum measured threshold current for uniformly pumped microlasers (58 mA) and standard ridge lasers (80 mA) of the same device size and material.

Original languageEnglish (US)
Article number151106
JournalApplied Physics Letters
Volume107
Issue number15
DOIs
StatePublished - Oct 12 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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