Modifying the coherence of vertical-cavity surface-emitting lasers using chaotic cavities

Omar Alkhazragi, Ming Dong, Liang Chen, Dong Liang, Tien Khee Ng, Junping Zhang, Hakan Bagci, Boon S. Ooi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Vertical-cavity surface-emitting lasers (VCSELs) have been widely adopted in a variety of applications in recent years, with even more applications currently under research and development as a result of the emergence of visible-light VCSELs. Most of these applications make use of the ease of fabrication of large two-dimensional arrays of lasers, a feature unique to VCSELs that makes them scalable and versatile. However, applications that rely on the uniformity of the emitted beam in the transverse plane, such as illumination, projection, holography, and displays, suffer from the coherence artifacts (speckles) that reduce the quality of the formed images when coherent lasers are used. In this work, we show that, by using a chaotic-cavity D-shaped mesa, the coherence of broad-area VCSELs can be substantially reduced (the number of mutually incoherent modes is almost doubled, and the spectral full width at half-maximum is increased from ∼1.1nm to ∼4.5nm), and the maximum achievable optical power is increased by up to 60%. The simplicity of implementing the reported design, which requires no additional fabrication steps, makes it a promising solution for applications that would benefit from the lower speckle density of the emitted light as well as those that rely on lower temporal coherence, such as time-domain optical coherence tomography and fiber-optic gyroscopes.
Original languageEnglish (US)
Pages (from-to)191
Issue number2
StatePublished - Jan 26 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-01-31
Acknowledged KAUST grant number(s): BAS/1/1614-01-01, GEN/1/6607-01-01, KCR/1/2081-01-01, KCR/1/4114-01-01, RGC/3/4275-01-01
Acknowledgements: Huawei Technologies (YBN2020085017); King Abdullah University of Science and Technology (BAS/1/1614-01-01, GEN/1/6607-01-01, KCR/1/2081-01-01, KCR/1/4114-01-01, RGC/3/4275-01-01).

ASJC Scopus subject areas

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


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