Design of Resonant Leaky-Wave Coupled Phase-Locked Arrays of Mid-IR Quantum Cascade Lasers

Chris Sigler*, Chun Chieh Chang, Jeremy Daniel Kirch, Luke J. Mawst, Dan Botez, Thomas Earles

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A theoretical analysis of the optical and thermal characteristics of planarized phase-locked quantum cascade laser (QCL) arrays emitting at 4.8 μm was performed. Large aperture seven-element designs are established with a reasonably large process window for achieving single in-phase-mode operation. Full-wave optical simulations of these high-index contrast photonic crystal devices were coupled with 2-D heat flow analysis to investigate the influence of thermal lensing on modal behavior. Self-focusing under thermally induced index variations across the array are expected to ultimately limit the single-mode operational range. Anti-resonant reflective-optical waveguide terminations for three-element arrays can decrease the in-phase mode threshold-current density, improve discrimination against array modes composed of coupled first-order element modes, and improve the in-phase-mode near-field uniformity under CW operation.

Original languageEnglish
Article number7115082
Pages (from-to)97-106
Number of pages10
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number6
Publication statusPublished - 2015 Nov 1
Externally publishedYes


  • Leaky waves
  • semiconductor laser arrays
  • simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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