Stimulated radiation emitted by lithium neodymium tetraphosphate LiNd (PO3)4and neodymium pentaphosphate NdP5O14powders

Ter‐Gabrielyan, Nikolay; Маркушев, В. М.; Belan, V R; Брискина, Ч. М.; Димитрова, О. В.; Zolin, V. F.; Lavrov, Alexandre

doi:10.1070/qe1991v021n08abeh003967

Cited by 46 publications

(13 citation statements)

References 4 publications

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“…units) threshold density increases dramatically. A qualitatively similar result was observed in neodymium random lasers in Ref 7. .…”

supporting

confidence: 87%

“…7 , stimulated emission supported by intra-granule resonance was observed in large, ~ 0.1 mm regularly shaped particles of NdP 5 O 14 . When the particles of the same materials were smaller, ~ 10 µm, and had irregular shapes, the stimulated emission in powder was supported by scattering in an ensemble of particles.…”

Section: Discussion Of the Mechanism Of Stimulated Emission And Applimentioning

confidence: 94%

“…Numerous studies [5][6][7][8][9][10][11][12][13][14][15][16][17] following pioneering work 4 revealed the following phenomena common to pulsed neodymium random (powder) lasers: (i) dramatic shortening of the emission pulse and narrowing of the emission spectral line above the threshold 5,8,9,16,17 ; (ii) short-pulsed, multiple-pulsed, and oscillating emission, which resembles relaxation oscillations in regular lasers 5,8,9,16 (relaxation oscillations in random lasers were studied theoretically in Refs. 2,3,5,9,10,12,[18][19][20]; and (iii) drift and hopping of the stimulated emission line within the same series of pulses 7,9,16 . Both low 8,[13][14][15] and high 13,15 degrees of coherence have been experimentally measured in different neodymium random lasers.…”

Section: Introductionmentioning

confidence: 99%

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Stimulated emission in scattering and composite dielectric media (random lasers): effect of particle size (Key Lecture)

et al. 2003

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Stimulated emission can be obtained in small volumes of scattering laser materials without cavity or any special optical design. Such sources of stimulated emission are known as random lasers. In random lasers, amplifying laser medium provides for gain, and scatterers (powder particles, air gaps between particles, etc.) provide for stimulated emission feedback. Above certain threshold pumping energy, the emission characteristics of random lasers change dramatically: the emission spectrum collapses to one or several narrow lines and one or several short emission pulses appear in response to a relatively long pumping pulse. Solid-state random lasers based on rare-earth doped dielectrics, dielectrics with color centers, semiconductors, scattering polymers, etc., offer challenging and not yet completely understood physics as well as promising applications, including express testing of laser materials, identification, and information processing. The focus of our presentation is on optically pumped neodymium random lasers. In particular, we discuss the dependence of the photon mean free path l t , the threshold energy density E th /S and the slope efficiency in neodymium random lasers as a function of the mean particles size s. The experimental results are compared with the predictions of the developed models.

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“…units) threshold density increases dramatically. A qualitatively similar result was observed in neodymium random lasers in Ref 7. .…”

supporting

confidence: 87%

Section: Discussion Of the Mechanism Of Stimulated Emission And Applimentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stimulated emission in scattering and composite dielectric media (random lasers): effect of particle size (Key Lecture)

et al. 2003

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“…The spectral shape of the emission has been found to be dependent on the size and shape of microcrystals. Only one emission line located at the maximum of the lumi-nescence band has been observed in the powders of microcrystals with the isometric shape, thus suggesting a feedbackless emission amplification mechanism, whereas for the powders of microcrystals with clearly anisometric shape several narrow (0.1 nm) emission lines have been detected [97]. The number of the lines is larger for larger pumping intensities and excitation areas.…”

Section: Such a Phenomenon Of Trapping Of Electrons In Disordered Matmentioning

confidence: 86%

Optically pumped mirrorless lasing. A review. Part I. Random lasing

Nastishin¹,

Dudok²

2013

Ukr. J. Phys. Opt.

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Abstract. Currently optically pumped mirrorless lasing is represented by three distinct branches, which concern lasing in different types of the gain media: optically random and photonic media, and microcavities. This article is a first part of our review on optically pumped mirrorless lasing, with the random lasing in scattering media being a main subject. The other mirrorless lasing mechanisms will be addressed in the second part. Considering light localization as a key function of the feedback, we discuss possible mechanisms for the light localization in the scattering media. Special attention is paid to the Anderson light localization. The other mechanisms of the light localization in the scattering media concern high Q-resonances in local microresonators, which exist due to structural inhomogeneities in the scattered media. Applications of the random lasers are shortly reviewed.

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“…The spectra of lasing obtained for some powders indicated the presence of resonance feedback. So in the lasing spectra of phosphates doped with neodymium more than one line presented [3]. In the middle of 1990 other groups investigated laser effect in other powders also doped with neodymium [4,5].…”

Section: Introductionmentioning

confidence: 98%

Lasing in powdered ZnO: current state of affairs

Ryzhkov¹,

Маркушев²,

Брискина³

et al.

Proceedings of CAOL 2005. Second International Conference on Advanced Optoelectronics and Lasers, 2005.

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Short review of the investigations of lasing in randomly inhomogeneous media in particular of lasing in powdered ZnO under picosecond pumping is given. Since the intrinsic lifetime of spontaneous UV emission in zinc oxide is less than 200 ps it is of interest to obtain stimulated UV radiation of powdered ZnO with pumping by pulses of nanosecond duration. This will clarify the possibility of quasi-continuous lasing in disordered media. In future this can open the way for working out a cathodoluminescent screen with narrow spectrum and short persistence time. Investigations of UV spectra of different powders of ZnO were conducted. In some of the samples investigated a narrowing of the UV band was observed with a rise of the pumping energy. At the same time a number of irregular narrow spikes appears on this band. The threshold density of pumping energy for appearance of this effect lies, depending on the sample, in the range of 2.7-27 mJ/cm2.

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Stimulated radiation emitted by lithium neodymium tetraphosphate LiNd (PO₃)₄and neodymium pentaphosphate NdP₅O₁₄powders

Cited by 46 publications

References 4 publications

Stimulated emission in scattering and composite dielectric media (random lasers): effect of particle size (Key Lecture)

Stimulated emission in scattering and composite dielectric media (random lasers): effect of particle size (Key Lecture)

Optically pumped mirrorless lasing. A review. Part I. Random lasing

Lasing in powdered ZnO: current state of affairs

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