Stimulated emission kinetics of neodymium powder lasers

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

doi:10.1070/qe1990v020n07abeh006817

Cited by 68 publications

(48 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the obtained value l p =l t max is smaller than l a ≈ 10 -1 cm (Ref. 5 ), satisfying the range of applicability of Eq. (11), and smaller than the diameter of the pumped spot in our experiment.…”

Section: Discussion Of the Mechanism Of Stimulated Emission And Applisupporting

confidence: 60%

“…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%

See 1 more Smart Citation

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

et al. 2003

View full text Add to dashboard Cite

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.

show abstract

Section: Discussion Of the Mechanism Of Stimulated Emission And Applisupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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

et al. 2003

View full text Add to dashboard Cite

show abstract

“…therein). The solid state random lasers developed to date are mainly based on crystal powders with the stimulated emission coming either from the near-bandgap electronic effects (exciton-exciton scattering or electron-hole plasma) as in the case of lasers based on ZnO material [14][15][16], or from the neodymium related electronic transitions in laser crystal powders doped with neodymium [17][18][19].…”

mentioning

confidence: 99%

Luminescence properties of ZnGa₂O₄ and ZnAl₂O₄ spinels doped with Eu³⁺ and Tb³⁺ ions

Rusu

Ursaki

Novitschi

et al. 2009

Phys. Status Solidi (c)

View full text Add to dashboard Cite

Spinel‐type ZnGa2O4 and ZnAl2O4 powders doped with Eu3+ and Tb3+ ions, including dual doping, have been prepared by solid phase reactions and by deposition from chemical solutions. XRD analysis demonstrates the high quality of spinel grains constituting the powder. The luminescence shows that the rare earth ions are incorporated in the defect regions at the grain boundaries. The emission spectra of the samples with europium are characterized by an intense emission in red region due to the 5D0 → 7F1,2 transitions of Eu3+ ions, whereas in the case of terbium the highest intensity corresponds to the green emission due to the 5D4 → 7F5 transitions of Tb3+ ions. The possibility to change the color of the emission from green to red by the variation of Tb and Eu doping concentration is demonstrated. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

“…If gain is implemented in the scattering medium these long light-paths are then amplified and in some cases this can give rise to a form of laser action generally referred to as random lasing. These random lasers, which combine optical amplification with multiple scattering, have been the subject of intense research over the past few years (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) . Random lasing has now been demonstrated in many different forms of random media such as laser crystal powders (1)(2)(3)(4) dye solutions containing micro-particles (5) , disordered semiconductors, (6,7) organic materials (8,9) , and human tissues (10) .…”

Section: Introductionmentioning

confidence: 99%

Nonresonant random lasing from a dye-doped smectic A* scattering device

et al. 2005

View full text Add to dashboard Cite

Nonresonant random lasing from a dye-doped smectic A* scattering device is demonstrated. The field-induced scattering state of a low molar mass liquid crystal in the smectic A* phase is found to provide sufficient feedback to generate random lasing when a gain material, such as a fluorescent dye, is doped into the liquid crystal host. Furthermore, we found that the emission intensity of the random laser at a given excitation energy can be adjusted by altering the strength of the applied electric field so as to modify the scattering texture and consequently the transport mean free path. This change in the transport mean free path results in a change in the random lasing threshold. Large values for the transport mean free path, which indicate a weak scattering strength, result in large threshold values and vice-versa. Finally, we discuss the benefits of controlling the scattering strength with an applied electric field in terms of potential device applications.

show abstract

Stimulated emission kinetics of neodymium powder lasers

Cited by 68 publications

References 1 publication

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)

Luminescence properties of ZnGa₂O₄ and ZnAl₂O₄ spinels doped with Eu³⁺ and Tb³⁺ ions

Nonresonant random lasing from a dye-doped smectic A* scattering device

Contact Info

Product

Resources

About

Stimulated emission kinetics of neodymium powder lasers

Cited by 68 publications

References 1 publication

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)

Luminescence properties of ZnGa2O4 and ZnAl2O4 spinels doped with Eu3+ and Tb3+ ions

Nonresonant random lasing from a dye-doped smectic A* scattering device

Contact Info

Product

Resources

About

Luminescence properties of ZnGa₂O₄ and ZnAl₂O₄ spinels doped with Eu³⁺ and Tb³⁺ ions