Abstract
We demonstrate that photonic crystals can be used to generate powerful and highly coherent laser radiation when injecting a beam of free electrons. Using theoretical investigations we present the startup dynamics and coherence properties of such laser, in which gain is provided by matching the optical phase velocity in the photonic crystal to the velocity of the electron beam.
Highlights
Controlling the fundamental strength of light and matter interaction with nanophotonic structures is of fundamental importance for the generation of radiation, as demonstrated with parametric emission, [1] in coherent interaction with vacuum fluctuations [2], and with controlling spontaneous emission [3,4]
We demonstrate that photonic crystals can be used to generate powerful and highly coherent Cherenkov radiation that is excited by the injection of a beam of free electrons
The laser output frequency expected from velocity matching can be obtained by comparing the electron beam velocity with the electromagnetic phase velocity
Summary
Controlling the fundamental strength of light and matter interaction with nanophotonic structures is of fundamental importance for the generation of radiation, as demonstrated with parametric emission, [1] in coherent interaction with vacuum fluctuations [2], and with controlling spontaneous emission [3,4]. In Bloch mode lasers the photonic crystal provides field enhancement via a reduced group velocity and forms a distributed feedback laser, which offers larger mode volumes and output. In all these photonic crystal lasers, the amplification of light is provided by conventional gain media, semiconductor quantum wells, quantum dots, or organic dyes. This principally limits the laser output wavelengths to the bound-electron transitions of the respective gain material
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