Journal article
Theory of Self-pulsing in Photonic Crystal Fano Lasers : Theory of Self-pulsing
Laser self-pulsing was a phenomenon exclusive to macroscopic lasers until recently, where self-starting laser pulsation in a microscopic photonic crystal Fano laser was reported. In this paper a theoretical model is developed to describe the Fano laser, including descriptions of the highly-dispersive Fano mirror, the laser frequency and the threshold gain.
The model is based upon a combination of conventional laser rate equations and coupled-mode theory. The dynamical model is used to demonstrate how the laser has two regimes of operation, continuous-wave output and self-pulsing, and these regimes are characterised using phase diagrams, establishing the regime of self-pulsing numerically.
Furthermore, the physics behind the self-pulsing mechanism are explained in detail and it is demonstrated how cavity absorption makes the Fano mirror function as a saturable absorber, leading to Q-switched pulse generation. A stability analysis is used to demonstrate how the dominant mechanism of instability is relaxation oscillations becoming un-damped.
Finally the effect of varying key self-pulsing parameters is investigated by characterisation of the change in self-pulsing regions.
Language: | English |
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Year: | 2017 |
Pages: | 1700089 |
ISSN: | 18638899 and 18638880 |
Types: | Journal article |
DOI: | 10.1002/lpor.201700089 |
ORCIDs: | Mørk, Jesper and Yu, Yi |