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Spectral correlations in a random distributed feedback fibre laser
Srikanth Sugavanam1, Mariia Sorokina1, Dmitry V Churkin2
1Aston Institute of Photonic Technologies, Aston University, Aston Triangle, Birmingham B4 7ET, UK.
Nature Communications
|May 19, 2017
Summary
Researchers discovered narrowband components and nonlinear correlations in random fibre laser spectra, challenging previous assumptions of incoherence. This finding links random fibre lasers to conventional random lasers.
Area of Science:
- Physics
- Photonics
- Laser Technology
Background:
- Random distributed feedback fibre lasers utilize amplified Rayleigh scattering for feedback.
- The feedback mechanism was previously considered incoherent, leading to smooth spectra.
Purpose of the Study:
- To investigate the spectral characteristics of random fibre lasers.
- To determine if coherent phenomena exist within their feedback mechanism.
Main Methods:
- Real-time spectral measurements using a scanning Fabry-Pérot interferometer.
- Statistical analysis of approximately 10^4 single-scan spectra.
- Mutual information analysis to detect nonlinear correlations.
Main Results:
- Observation of long-living narrowband components within the laser spectrum.
- Statistical analysis revealed preferential interspacing and intensity anticorrelation of these components.
- Nonlinear correlations between different spectral regions were confirmed.
Conclusions:
- The findings challenge the notion of incoherence in random fibre lasers.
- The observed narrowband components and correlations establish a link to conventional random lasers.
- This study provides new insights into the physics of random laser feedback mechanisms.
