Investigation of random lasers with resonant feedback

Ling, Y.; Cao, Hui; Burin, Alexander L.; Ratner, Mark A.; Liu, Xiaohui; Chang, Robert P. H.

doi:10.1103/physreva.64.063808

Cited by 183 publications

(149 citation statements)

References 28 publications

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“…It can be clearly seen that the threshold gain strongly increases with decreasing excitation spot area. 11,21 However, it should be noted that this behavior is typical for amplified spontaneous emission whether or not the feedback through scattering of emitted light is involved. In Fig.…”

Section: Two-photon Pumped Random Laser In Nanocrystalline Znomentioning

confidence: 99%

“…9 Random laser effect is well studied experimentally in colloidal and microsized media. 10,11 But studies in case of nanostructured materials are not so well advanced because of lack of pure and size controlled ZnO nanocluster materials. In this letter, we report the lasing effect in nanostuctured ZnO thin films under single or/and multiple photon excitation.…”

Section: Two-photon Pumped Random Laser In Nanocrystalline Znomentioning

confidence: 99%

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Two-photon pumped random laser in nanocrystalline ZnO

Chelnokov

Bityurin

Ozerov

et al. 2006

Applied Physics Letters

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International audienceThin film of ZnO nanoparticles with dimension of about 5–10 nm were fabricated by the pulsed laser ablation method. By using a femtosecond laser beam at 700 nm to pump micrometer-thick films the authors observed two-photon-induced lasing at 385 nm. Experimentally obtained dependence of the threshold on the excitation spot radius r0 is closer to (1/r_0^2) than to (1/r_0), thus suggesting efficiency of the feedback by scattering-random lasing. The experimental data on nonlinear transmission of the film at the wavelength of pumping are presented

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Section: Two-photon Pumped Random Laser In Nanocrystalline Znomentioning

confidence: 99%

Section: Two-photon Pumped Random Laser In Nanocrystalline Znomentioning

confidence: 99%

Two-photon pumped random laser in nanocrystalline ZnO

Chelnokov

Bityurin

Ozerov

et al. 2006

Applied Physics Letters

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“…Feedback in these lasers is provided by the random scattering of light in a medium with spatially fluctuating refractive index. Random lasing has been demonstrated in semiconducting clusters and films [1] as well as in solutions of TiO 2 nanoparticles [2,3] and in polymer systems [4]. Random lasers typically have dimensions of several µm and may prove useful in microtechnology applications [5].…”

Section: Introductionmentioning

confidence: 99%

Field quantization for open optical cavities

2003

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We study the quantum properties of the electromagnetic field in optical cavities coupled to an arbitrary number of escape channels. We consider both inhomogeneous dielectric resonators with a scalar dielectric constant ǫ(r) and cavities defined by mirrors of arbitrary shape. Using the Feshbach projector technique we quantize the field in terms of a set of resonator and bath modes. We rigorously show that the field Hamiltonian reduces to the system-and-bath Hamiltonian of quantum optics. The field dynamics is investigated using the input-output theory of Gardiner and Collet. In the case of strong coupling to the external radiation field we find spectrally overlapping resonator modes. The mode dynamics is coupled due to the damping and noise inflicted by the external field. For wave chaotic resonators the mode dynamics is determined by a non-Hermitean random matrix. Upon including an amplifying medium, our dynamics of open-resonator modes may serve as a starting point for a quantum theory of random lasing.

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“…[5] Experimentally we observed the number of lasing modes in micropatterned ZnO polycrystalline films saturates at high pumping intensity. [18] The saturated number 2 of lasing modes increases linearly with the sample volume.…”

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confidence: 99%

Mode repulsion and mode coupling in random lasers

et al. 2003

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We studied experimentally and theoretically the interaction of lasing modes in random media. In a homogeneously broadened gain medium, cross gain saturation leads to spatial repulsion of lasing modes. In an inhomogeneously broadened gain medium, mode repulsion occurs in the spectral domain. Some lasing modes are coupled through photon hopping or electron absorption and reemission. Under pulsed pumping, weak coupling of two modes leads to synchronization of their lasing action. Strong coupling of two lasing modes results in anti-phased oscillations of their intensities.Typeset using REVT E X 1

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Investigation of random lasers with resonant feedback

Cited by 183 publications

References 28 publications

Two-photon pumped random laser in nanocrystalline ZnO

Two-photon pumped random laser in nanocrystalline ZnO

Field quantization for open optical cavities

Mode repulsion and mode coupling in random lasers

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