Experimental and theoretical investigation of statistical regimes in random laser emission

Ignesti, Emilio; Tommasi, Federico; Fini, Lorenzo; Lepri, Stefano; Radhalakshmi, Vivekananthan; Wiersma, Diederik S.; Cavalieri, Stefano

doi:10.1103/physreva.88.033820

Cited by 76 publications

(75 citation statements)

References 25 publications

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“…In such a case rare long-lived modes can acquire a lot of energy and appear as energetic random spikes on top of a broad emission spectrum. Thus, it is evident that near threshold the α -stable fit leads to lowest vales of α , because at higher energies a strong coupling emerges due the larger number of modes26.…”

Section: Resultsmentioning

confidence: 96%

“…As the characterization of α reported below will show, the three levels of pump energy correspond to three different statistical regimes (First Gaussian, Lévy, Second Gaussian) in the first case and two in the second one (First and Second Gaussian). Our previous works212627 have described in detail that these statistical regimes depend on the pumping energy and the scattering strength of the samples; in particular, a critical role is played by the ratio between L s and the linear dimension w of the active zone of the medium. In the case of , the weak modes coupling given by a moderate competition for the available gain, leads to a broadening of the energies interval involved by the Lévy regime.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, we studied a sample where a Lévy regime does not occur, because the comparison between the active zone dimension and L s in this case does not allow it, as previous works has reported2627. Although the lack of strong fluctuations in such a sample as the energy increase (α ~ 2), the threshold is detectable in the energy interval within which the RSB sets in.…”

Section: Discussionmentioning

confidence: 99%

“…The statistical properties of these regimes have been studied1521 as well as the presence of a crossovers among them22232425. A link between theory and experiment has been eventually found via the comparison between Monte Carlo simulations and the statistics of experimental emission spectra2627. The α -exponent, obtained from the α -stable distribution fit of the peak intensity histogram, has been used as an indicator for characterizing the statistical regimes and also the threshold condition28.…”

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confidence: 99%

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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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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Robustness of replica symmetry breaking phenomenology in random laser

Tommasi

Ignesti

Lepri

et al. 2016

Sci Rep

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“…Random lasers123 (RLs) are a special class of lasers with Lévy-type distributions of intensity fluctuations45678910111213, which has been recently exploited as a photonic platform for studies of complex systems, such as spin glasses141516171819202122. RLs were originally proposed23 by Letokhov in the late 1960’s, but their first unambiguous observation was only reported in 1994 by Lawandy and collaborators24.…”

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Observation of Lévy distribution and replica symmetry breaking in random lasers from a single set of measurements

Gomes¹,

Raposo²,

Moura³

et al. 2016

Sci Rep

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Random lasers have been recently exploited as a photonic platform for studies of complex systems. This cross-disciplinary approach opened up new important avenues for the understanding of random-laser behavior, including Lévy-type distributions of strong intensity fluctuations and phase transitions to a photonic spin-glass phase. In this work, we employ the Nd:YBO random laser system to unveil, from a single set of measurements, the physical origin of the complex correspondence between the Lévy fluctuation regime and the replica-symmetry-breaking transition to the spin-glass phase. A novel unexpected finding is also reported: the trend to suppress the spin-glass behavior for high excitation pulse energies. The present description from first principles of this correspondence unfolds new possibilities to characterize other random lasers, such as random fiber lasers, nanolasers and small lasers, which include plasmonic-based, photonic-crystal and bio-derived nanodevices. The statistical nature of the emission provided by random lasers can also impact on their prominent use as sources for speckle-free laser imaging, which nowadays represents one of the most promising applications of random lasers, with expected progress even in cancer research.

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Experimental and Theoretical Investigation of the Polymer Optical Fiber Random Laser with Resonant Feedback

Chan

Cheng

et al. 2018

Advanced Optical Materials

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demonstration of RFL by inserting TiO 2 particles and rhodamine 6G dyes into the hollow core of a photonic crystal fiber, which opened the research field of RFLs. [15] Subsequently, both coherent and incoherent RFLs based on various fiber structures have been demonstrated. [16][17][18] These RFLs have several merits like low threshold, directional output, and low-cost fabrication, indicating that they are superior to other conventional RLs in some applications. [16] According to the feedback mechanism, RFLs can be generally classified into two categories: (1) RFLs based on common single mode fibers with the feedback provided by Rayleigh scattering and Raman effect, [19][20][21][22][23][24][25] (2) RFLs based on specific fibers (e.g., liquid core optical fibers, polymer optical fibers, and erbium-doped fibers) with the feedback provided by doped particles or randomly distributed Bragg gratings. [16,[26][27][28][29][30][31] For the first type of RFLs, their length are normally more than several kilometers, which limits their applications. [18] Conversely, the size of the second type of RFLs is in the centimeter scale. [26] Moreover, the properties of the second type of RFLs (e.g., shape, size, lasing wavelength, and laser threshold) could be tuned via controlling the fiber materials, scatterers, and optical gain medium. [27,28,32] As a result, the second type of RFLs can be regarded as ideal experimental systems for the investigation of random lasing with novel materials (like plasmonic materials), which have already been reported in several studies. [17,33,34] However, these studies mainly focus on experimental studies and corresponding theoretical models are still lacking to date. There is a need to find an effective numerical model to describe the lasing dynamic in the RFLs. Moreover, although RFLs have great potential in various applications, no practical application has been reported in the past studies.In the present work, we have demonstrated polymer optical fiber RLs (POFRLs) by doping TiO 2 nanoparticles and Rh640 perchlorate dyes into the core of the POFs. The optical gain in our POFRL was provided by Rh640 perchlorate dyes which are widely used organic luminescent dyes for many dye laser systems. The TiO 2 nanoparticles worked as scatterers to provide multiscattering events for light propagation and the resulting scattering strength is in the weakly scattering regime (scattering mean free path l s ≫ emission wavelength λ). Multimode and coherent random lasing was observed in our POFRLs, which 1D random fiber laser is a novel fiber-based laser, which exhibits many unique optical properties and shows great promise for various applications including speckle-free imaging. A multimode and coherent polymer optical fiber random laser (POFRL) is successfully fabricated by doping TiO 2 nanoparticles and Rh640 perchlorate dyes in the core of a polymer optical fiber (POF). The waveguide effect provided by the POF greatly increases the multiscattering events for light propagation and results in laser cavity with muc...

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Experimental and theoretical investigation of statistical regimes in random laser emission

Cited by 76 publications

References 25 publications

Robustness of replica symmetry breaking phenomenology in random laser

Robustness of replica symmetry breaking phenomenology in random laser

Observation of Lévy distribution and replica symmetry breaking in random lasers from a single set of measurements

Experimental and Theoretical Investigation of the Polymer Optical Fiber Random Laser with Resonant Feedback

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