Results 21 to 30 of about 1,917 (117)
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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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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Random Laser Action in Dye-Doped Polymer Media with Inhomogeneously Distributed Particles and Gain
Applied Sciences, 2019 The properties of random lasing are investigated for bubble-structure (BS) dye-doped polymer random media in which non-scattering and no-gain regions are distributed.
Takashi Okamoto, Masaki Mori
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Molecules, 2021 Quinoline Schiff bases display potential applications in optoelectronics and laser fields because of their unique optical properties that arise from extensive delocalization of the electron cloud, and a high order of non-linearity. In this context, a new
Abdulrahman I. Almansour +6 more
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Optics Express, 2005 A microchip-type laser with multiple scattering from powder as necessary feedback is demonstrated. The laser consists of a transparent ceramic Nd:YAG microchip and a Nd:YAG powder tablet, operates at quasi-continuous- wave regime pumped by a laser diode array.
Yan, Feng +4 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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Direct Measurement of the Reduced Scattering Coefficient by a Calibrated Random Laser Sensor
Sensors, 2022 The research in optical sensors has been largely encouraged by the demand for low-cost and less or non-invasive new detection strategies. The invention of the random laser has opened a new frontier in optics, providing also the opportunity to explore new
Federico Tommasi +4 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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