Random lasing in Nd:LuVO_4 crystal powder

Azkargorta, J.; Bettinelli, Marco; Iparraguirre, I.; Garcı́a-Revilla, Sara; Balda, Rolindes; Fernández, J.

doi:10.1364/oe.19.019591

Cited by 30 publications

(26 citation statements)

References 22 publications

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“…These lasing systems show apparent relaxation oscillations of the order of nanoseconds [8,12,13,18], which are typical of this kind of laser where the spontaneous excited state decay time is much longer than the residence time of the emitted photons in the cavity; this behavior is also found in other types of RL [19,20].…”

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confidence: 80%

“…Among rare-earthactivated powders, those based on Nd 3 are especially interesting due to their low threshold and high efficiency in almost every host [8][9][10][11][12][13][14][15][16][17].…”

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confidence: 99%

“…In conventional lasing systems the simplest theoretical approach to study their temporal behavior consists in the simulation by means of rate-equations, which has also been widely applied to RL [8,12,13,18,19,21]. However, problems of interpretation of the experimental results still remain, because the period of the observed oscillations is not compatible with the expected value of the photon residence time [8,13,19] and frequently the obtained values are justified assuming a photon occupation volume larger than the pumped volume [8,12,13], or equivalently, two different photon residence times.…”

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confidence: 99%

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On the temporal behavior of Nd^3+ random lasers

et al. 2013

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The temporal dynamics of random laser emission from Nd-doped crystal powders has been investigated by using an improved detection device. The precise conditions to detect high contrast, fast oscillations are described. The measured period is about one order of magnitude shorter than the one given in the literature for relaxation oscillations in these materials. The origin of these differences is discussed.

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confidence: 80%

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confidence: 99%

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confidence: 99%

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On the temporal behavior of Nd^3+ random lasers

et al. 2013

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“…[4,5,6,7,8,9]. Many efforts have been made to develop a general theoretical treatment for random lasers (RLs) including spectral behavior [10,11,12], temporal dynamics [13,14,15,16], thresholds [17,18,19,20,21], output energies, etc. ; however, due to the very wide range of material types, of scattering regimes, of pumped time scales, etc.…”

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confidence: 99%

Random Laser Action in Nd:YAG Crystal Powder

et al. 2016

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This work explores the room temperature random stimulated emission at 1.064 μm of a Nd:YAG crystal powder (Neodymium-doped yttrium aluminum garnet) in a very simple pump configuration with no assistance from an internal mirror. The laser threshold energy as a function of pump beam area and pump wavelength has been measured, as well as the temporal dynamics of emission pulses. The absolute energy of stimulated emission and the absolute laser slope efficiency have been measured by using a method proposed by the authors. The results show a surprising high efficiency that takes the low Nd3+ ion concentration of the crystal powder into account.

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“…Since then, a rich variety of materials has been employed in RLs, e.g. powders of active materials8, dye doped biological tissue9, liquid crystals10, optical fibres11, and polymers12.…”

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confidence: 99%

Lasing optical cavities based on macroscopic scattering elements

Consoli

López

2017

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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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Random lasing in Nd:LuVO_4 crystal powder

Cited by 30 publications

References 22 publications

On the temporal behavior of Nd^3+ random lasers

On the temporal behavior of Nd^3+ random lasers

Random Laser Action in Nd:YAG Crystal Powder

Lasing optical cavities based on macroscopic scattering elements

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