Related Experiment Video
Updated: May 2, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
Unidirectional lasing emerging from frozen light in nonreciprocal cavities
H Ramezani1, S Kalish1, I Vitebskiy2
1Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
Abstract:
We introduce a class of unidirectional lasing modes associated with the frozen mode regime of nonreciprocal slow-wave structures. Such asymmetric modes can only exist in cavities with broken time-reversal and space inversion symmetries. Their lasing frequency coincides with a spectral stationary inflection point of the underlying passive structure and is virtually independent of its size. These unidirectional lasers can be indispensable components of photonic integrated circuitry.

