Modeling and analysis of an ultra-stable subluminal laser

Zifan Zhou*, Joshua Yablon, Minchuan Zhou, Ye Wang, Alexander Heifetz, M. S. Shahriar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We describe a subluminal laser which is extremely stable against perturbations. It makes use of a composite gain spectrum consisting of a broad background along with a narrow peak. The stability of the laser, defined as the change in frequency as a function of a change in the cavity length, is enhanced by a factor given by the group index, which can be as high as 105 for experimentally realizable parameters. We also show that the fundamental linewidth of such a laser is expected to be smaller by the same factor. We first present an analysis where the gain profile is modeled as a superposition of two Lorentzian functions. We then present a numerical study based on a physical scheme for realizing the composite gain profile. In this scheme, the broad gain is produced by a high pressure buffer-gas loaded cell of rubidium vapor. The narrow gain is produced by using a Raman pump in a second rubidium vapor cell, where optical pumping is used to produce a Raman population inversion. We show close agreement between the idealized model and the explicit model. A subluminal laser of this type may prove to be useful for many applications.

Original languageEnglish (US)
Pages (from-to)6-19
Number of pages14
JournalOptics Communications
StatePublished - Jan 1 2016


  • Laser
  • Optics
  • Photonics
  • Slow light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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