Phase diagram and complexity of mode-locked lasers: from order to disorder.
We investigate mode-locking processes in lasers displaying a variable degree of structural randomness. By a spin-glass theoretic approach, we analyze the mean-field Hamiltonian and derive a phase diagram in terms of pumping rate and degree of disorder. Paramagnetic (noisy continuous wave emission), ferromagnetic (standard passive mode locking), and spin-glass phases with an exponentially large number of configurations are identified. The results are also relevant for other physical systems displaying a random Hamiltonian, such as Bose-condensed gases and nonlinear optics.
Leuzzi
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Research center SMC INFM-CNR, c/o Università di Roma Sapienza, I-00185, Roma, Italy.
Conti
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Folli
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Angelani
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L
Ruocco
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