Signal amplification and control in optical cavities with off-axis feedback

Roberta Zambrini, Francesco Papoff

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Abstract

We consider a large class of optical cavities and gain media with an off-axis external feedback which introduces a two-point nonlocality. This nonlocality moves the lasing threshold and opens large windows of control parameters where weak light spots can be strongly amplified while the background radiation remains very low. Furthermore, transverse phase and group velocities of a signal can be independently tuned and this enables us to steer it nonmechanically, to control its spatial chirping, and to split it into two counterpropagating ones.
Original languageEnglish
Number of pages5
JournalPhysical Review Letters
Volume99
Issue number6
DOIs
Publication statusPublished - 9 Aug 2007

Keywords

  • signal amplification
  • optical cavities
  • off-axis feedback
  • optics

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