Dynamics of phase-locking random lasers

Leonetti, Marco; Conti, Claudio; López, Cefe

doi:10.1103/physreva.88.043834

Cited by 27 publications

(24 citation statements)

References 32 publications

(46 reference statements)

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“…Only recently, this behavior has been understood as a multimode emission in both cases, with the “non-resonant” regime consisting of a large number of modes mutually coupled together, resulting in a broad single-peaked spectrum171819.…”

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confidence: 99%

Lasing optical cavities based on macroscopic scattering elements

Consoli

López

2017

Sci Rep

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Two major elements are required in a laser device: light confinement and light amplification. Light confinement is obtained in optical cavities by employing a pair of mirrors or by periodic spatial modulation of the refractive index as in photonic crystals and Bragg gratings. In random lasers, randomly placed nanoparticles embedded in the active material provide distributed optical feedback for lasing action. Recently, we demonstrated a novel architecture in which scattering nanoparticles and active element are spatially separated and random lasing is observed. Here we show that this approach can be extended to scattering media with macroscopic size, namely, a pair of sand grains, which act as feedback elements and output couplers, resulting in lasing emission. We demonstrate that the number of lasing modes depends on the surface roughness of the sand grains in use which affect the coherent feedback and thus the emission spectrum. Our findings offer a new perspective of material science and photonic structures, facilitating a novel and simple approach for the realization of new photonics devices based on natural scattering materials.

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confidence: 99%

Lasing optical cavities based on macroscopic scattering elements

Consoli

López

2017

Sci Rep

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“…From a theoretical point of view, such a system can be described as a complex dynamics among a huge number of interacting modes11 in a way strongly dependent on the scattering and on the energy stored in the gain medium. A mode-coupling theory based on time-dynamics of frequency-locking mechanism has also been elaborated1213. A complementary approach, describing photons as diffusing particles, has been also pursued.…”

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confidence: 99%

Robustness of replica symmetry breaking phenomenology in random laser

Tommasi

Ignesti

Lepri

et al. 2016

Sci Rep

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Random lasers are optical sources where light is amplified by stimulated emission along random paths through an amplifying scattering medium. Connections between their physics and the one of quenched disordered nonlinear systems, notably spin glasses, have been recently suggested. Here we report a first experimental study of correlations of spectral fluctuations intensity in a random laser medium where the scatterers displacement significantly changes among consecutive shots. Remarkably, our results reveal that the replica symmetry breaking (RSB) phenomenology is robust with respect to an averaging over different realizations of the disorder. Moreover, besides opening new intriguing questions about the understanding of such a phenomenon, this work aims to clarify the connection between the RSB with the onset of the Lévy regime, i.e. the fluctuations regime that is a peculiar feature of the random lasing under critical conditions. Our results suggest that the former occurs independently of the latter and then the RSB phenomenology is a generic feature linked to the random laser threshold.

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“…To date, random lasing has been achieved in a wide range of media, including nanocrystalline ZnO powers 7,8 , ceramics 9 , organic composites 10 and nanoparticles (e.g., TiO 2 , ZnO and GaN) dispersed in fluorescent dyes 1,[11][12][13][14] . The lasing frequencies have been demonstrated to range from the near-ultraviolet to the mid-infrared (mid-IR) 15 .…”

Section: Introductionmentioning

confidence: 99%

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Zeng

Liang

et al. 2016

ACS Photonics

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Random lasers are a special class of laser in which light is confined through multiple scattering and interference process in a disordered medium, without a traditional optical cavity. They have been widely studied to investigate fundamental phenomena such as Anderson localization, and for applications such as speckle-free imaging, benefitting from multiple lasing modes. However, achieving controlled localized multi-mode random lasing at long wavelengths, such as in the terahertz (THz) frequency regime, remains a challenge.Here, we study devices consisting of randomly-distributed pillars fabricated from a quantum cascade gain medium, and show that such structures can achieve transversemagnetic polarized (TM) multi-mode random lasing, with strongly localized modes at THz frequencies. The weak short-range order induced by the pillar distribution is sufficient to ensure high quality-factor modes that have a large overlap with the active material.Furthermore, the emission spectrum can be easily tuned by tailoring the scatterer size and filling fraction. These "designer" random lasers, realized using standard photolithography 2 techniques, provide a promising platform for investigating disordered photonics with predesigned randomness in the THz frequency range, and may have potential applications such as speckle-free imaging.

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Dynamics of phase-locking random lasers

Cited by 27 publications

References 32 publications

Lasing optical cavities based on macroscopic scattering elements

Lasing optical cavities based on macroscopic scattering elements

Robustness of replica symmetry breaking phenomenology in random laser

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

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