Results 21 to 30 of about 161,808 (257)
Physical Review Letters, 2007 We investigate the effects of two dimensional confinement on the lasing properties of a classical random laser system operating in the incoherent feedback (diffusive) regime. A suspension of 250nm rutile (TiO2) particles in a Rhodamine 6G solution was inserted into the hollow core of a photonic crystal fiber (PCF) generating the first random fiber ...
de Matos, Christiano J. S. +5 more
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Coherent instabilities in random lasers [PDF]
Physical Review A, 2011 A numerical study is presented of random lasers as a function of the pumping rate above the threshold for lasing. Depending on the leakiness of the system resonances, which is typically larger in random lasers compared to conventional lasers, we observe that the stationary lasing regime becomes unstable above a second threshold.
Andreasen, Jonathan +2 more
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Generation of Narrow Modes in Random Raman Fiber Laser Based on Multimode Fiber
Photonics, 2023 We present a new design of a random Raman fiber laser based on a graded-index multimode fiber as the media composing the cavity that allows the generation of narrow spectral lines.
Ilya D. Vatnik +2 more
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Nanophotonics, 2023 A light source with narrowband, sufficient brightness, and low spatial coherence is required for certain applications such as optical imaging and free-space optical communication.
Wan Yuan +6 more
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Probability of Reflection by a Random Laser
Physical Review Letters, 1996 A theory is presented (and supported by numerical simulations) for phase-coherent reflection of light by a disordered medium which either absorbs or amplifies radiation. The distribution of reflection eigenvalues is shown to be the Laguerre ensemble of random-matrix theory. The statistical fluctuations of the albedo (the ratio of reflected and incident
Beenakker, C.W.J. +2 more
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Photonics, 2023 We studied the properties of ultra-narrow spectral modes, appearing in random distributed feedback Raman fiber lasers, for different fibers building up a laser cavity.
Ilya D. Vatnik +2 more
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Speckle experiments in random lasers [PDF]
Physical Review E, 2002 We present measurements of speckle in a random laser. We analyze its first-order statistics and show that, contrary to what might be expected for passive systems, analyses of the intensity distribution P(I) and the speckle spot size do provide information about light transport inside the system. P(I) is used to determine the degree to which an incident
van Soest, G. +2 more
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Wavelength-switchable L-band fiber laser assisted by ultrafast laser fabricated random reflectors [PDF]
EPJ Web of Conferences, 2022 A wavelength-switchable L-band erbium-doped fiber laser (EDFL) assisted by an artificially controlled backscattering (ACB) fiber reflector is here presented.
Perez-Herrera Rosa Ana +5 more
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A glassy model for random lasers [PDF]
Philosophical Magazine, 2007 We report oil a recent model introduced to describe the behaviour Of light in a nonlinear active random medium, i.e., laser. The emitted radiation is described by I disordered mean-field Hamiltonian for the phases of the complex amplitudes of the electromagnetic field modes. Using the replica trick the thermodynamics can be exactly solved.
L. ANGELANI +3 more
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