Phase tuning in coherently coupled VCSEL array

Matthew T. Johnson, Dominic F. Siriani, Kent D. Choquette

Research output: Contribution to journalConference articlepeer-review


Two potential applications of coherently coupled vertical cavity surface emitting laser (VCSEL) phased arrays include beam-steering [1,2] and high-brightness sources [3]. While a major difficulty for high brightness VCSEL arrays has been that typical evanescent coupling designs lead to the undesired out-of-phase supermode [4], we have shown reliable in-phase operation using ion-implantation and photonic crystal confinement, which requires a relatively simple fabrication process [5]. Common to both beam-steering and high power applications is the need to carefully control the phase difference between neighboring elements of the optically coupled array. We report measurement of the relative phase in coherently-coupled in-phase VCSEL arrays and show that the phase can be varied by differential current injection over a full range of π, requiring 200 μA, which is several orders of magnitude lower than phase tuning by similar methods in slab-coupled lasers [6].

Original languageEnglish (US)
Article number6348381
Pages (from-to)155-156
Number of pages2
JournalConference Digest - IEEE International Semiconductor Laser Conference
StatePublished - 2012
Event23rd IEEE International Semiconductor Laser Conference, ISLC 2012 - San Diego, CA, United States
Duration: Oct 7 2012Oct 10 2012

ASJC Scopus subject areas

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


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