Physics – Optics
Scientific paper
2006-08-03
Phys Rev A 74 (2006) 063801
Physics
Optics
18 pages, 28 figures, submitted to Physical Review A
Scientific paper
10.1103/PhysRevA.74.063801
The limits of applicability of the Lang-Kobayashi (LK) model for a semiconductor laser with optical feedback are analyzed. The model equations, equipped with realistic values of the parameters, are investigated below solitary laser threshold where Low Frequency Fluctuations (LFF) are usually observed. The numerical findings are compared with experimental data obtained for the selected polarization mode from a Vertical Cavity Surface Laser (VCSEL) subject to polarization selective external feedback. The comparison reveals the bounds within which the dynamics of the LK can be considered as realistic. In particular, it clearly demonstrates that the deterministic LK, for realistic values of the linewidth enhancement factor $\alpha$, reproduces the LFF only as a transient dynamics towards one of the stationary modes with maximal gain. A reasonable reproduction of real data from VCSEL can be obtained only by considering noisy LK or alternatively deterministic LK for extremely high $\alpha$-values.
Barland Stephane
Giacomelli Giovanni
Marin Francesco
Torcini Alessandro
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