Abstract
We report the implementation of a one-dimensional random laser based on an Er/Ge co-doped single-mode fiber with randomly spaced Bragg gratings. The random grating array forms a complex cavity with high quality factor resonances in the range of gain wavelengths centered around 1535.5 nm. The reflection spectra of the grating array and the emission spectra of the laser are investigated for different numbers of gratings. The experimental results are compared qualitatively with numerical simulations of the light propagation in one-dimensional Bragg grating arrays based on a transfer matrix method. The system is pumped at 980 nm and the experimentally observed output radiation presents a typical laser threshold behavior as a function of the pump power. We find that the laser output contains several competing spectral modes.
Highlights
Random lasers (RL), in which optical gain is combined with multiple scattering of the light inside an active medium, are the subject of scientific interest due to their unusual properties and promising potential applications [1, 2, 3]
We report the implementation of a one-dimensional random laser based on an Er/Ge co-doped single-mode fiber with randomly spaced Bragg gratings
The random grating array forms a complex cavity with high quality factor resonances in the range of gain wavelengths centered around 1535.5 nm
Summary
Random lasers (RL), in which optical gain is combined with multiple scattering of the light inside an active medium, are the subject of scientific interest due to their unusual properties and promising potential applications [1, 2, 3]. With these pump levels, the systems were above threshold in all cases. Notice that the evaluation of each spectrum by the analyser takes about 1 second, which is much shorter than the evolution of the observed fluctuations
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