Quantum efficiency and excited-state relaxation dynamics in neodymium-doped phosphate laser glasses

The Nd-nanocluster coupling strength and its effect in excitation/de-excitation of Nd 3+ luminescence in Nddoped silicon-rich silicon oxide Appl. Phys. Lett. 83, 2778Lett. 83, (2003 We report on the microstructure and photoluminescence ͑PL͒ properties of Nd-doped SiO 2 thin films containing silicon nanoparticles ͑Si-np͒ as a function of the annealing temperature and the Nd concentration. The thin films, which were grown on Si substrates by reactive magnetron co-sputtering, contain the same Si excess. Fourier transform infrared ͑FTIR͒ spectra show that a phase separation occurs during the annealing due to the agglomeration of the Si excess resulting in the formation of Si-np. Besides, after annealing, the films exhibit PL from excitonic states confined in Si-np. We showed that the intensity of the PL of Nd 3+ ions that occurs at ϳ0.92, 1.06, and 1.4 m is maximal at low Nd concentration and while well-passivated Si-np are formed. FTIR and x-ray measurements showed that the increase in the Nd incorporation has detrimental effects on the PL of Nd 3+ because of the formation of Nd 2 O 3 nanocrystals and inherent disorder in the SiO 2 host matrix. PL excitation measurements demonstrate that the PL of Nd 3+ ions is nonresonant and follows the excitation of Si-np giving new evidence of the energy transfer from Si-np toward the rare earth ions.

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“…8͒ as reported in glass matrices. 39,40 This is supported by the existence of Nd 2 O 3 nanocrystals in the FIG. 7.…”

Section: Discussionmentioning

confidence: 75%

Effect of annealing and Nd concentration on the photoluminescence of Nd3+ ions coupled with silicon nanoparticles

Debieu

Bréard

Podhorodecki

et al. 2010

Journal of Applied Physics

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“…It presents a bump at the temperature called T M , T M = 11.2 K. This is the anomalous behavior that is well known to occur in the specific heat of glasses at low temperature. [25][26][27][28][29][30] It is not expected to happen in materials that obey the Debye law-crystalline solids. It is driven by the presence of additional phonon states in the glassy system.…”

Section: Resultsmentioning

confidence: 99%

Influence of temperature and excitation procedure on the athermal behavior of Nd3+-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements

Astrath

Barboza

Medina

et al. 2009

Journal of Applied Physics

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2009Influence of temperature and excitation procedure on the athermal behavior of Nd(3+)-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements JOURNAL OF APPLIED PHYSICS, v.106, n.7, 2009 http://producao.usp.br/handle/BDPI/16575 In this work, thermal and optical properties of the commercial Q-98 neodymium-doped phosphate glass have been measured at low temperature, from 50 to 300 K. The time-resolved thermal lens spectrometry together with the optical interferometry and the thermal relaxation calorimetry methods were used to investigate the glass athermal characteristics described by the temperature coefficient of the optical path length change, ds / dT. The thermal diffusivity was also determined, and the temperature coefficients of electronic polarizability, linear thermal expansion, and refractive index were calculated and used to explain ds / dT behavior. ds / dT measured via thermal lens method was found to be zero at 225 K. The results provided a complete characterization of the thermo-optical properties of the Q-98 glass, which may be useful for those using this material for diode-pumped solid-state lasers.

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“…The rare earth ions exhibit interesting phenomenon such as shielding effect and hypersensitivity so they have been extensively used in various laser technology applications. [1] The materials incorporated with various rare earth ions can show intense emissions starting from ultraviolet (UV) to near infrared (NIR) regions due to their intra 4f-4f and 4f-5d transitions under various excitation wavelengths. [2] Each rare earth ion has its own significance in the respective field, like dysprosium (Dy 3+ ) doped materials are widely used in the generation of white light and in energy efficient display devices.…”

Section: Introductionmentioning

confidence: 99%

Effect of erbium ion concentration on structural and luminescence properties of lead borosilicate glasses for fiber amplifiers

2017

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This investigation reports, the effect of the concentration of erbium and lead ions on the physical, structural and optical properties of lead borosilicate glasses. These glasses were synthesized by the melt quench method. In the synthesis, the concentration of the erbium (Er 3+ ) ion was varied in the order of 0.0, 0.1, 0.5, 1.0 and 2.0 mol% and lead (Pb 2+ ) ion was varied in the order of 30, 29.9, 29.5, 29 and 28 mol%. The glasses were analyzed using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and UV-vis-NIR spectroscopy. From XRD, the amorphous nature of lead borosilicate glasses was confirmed. The functional groups which were present in the glasses have been identified by analyzing the FT-IR spectrum. From the absorption spectra, the oscillator strengths as well as the Judd-Ofelt (JO) intensity parameters were determined and compared with other hosts. The JO intensity parameters were further used to calculate certain radiative properties for the excited luminescent levels of Er 3+ ion. From emission spectra, full width at half maxima (FWHM), stimulated emission cross-sections (σ e ) and certain lasing parameters were evaluated and compared with reference host glasses. The lifetimes of 4 I 13/2 excited level of Er 3+ ion have also been recorded and analyzed. The calculated and experimental lifetimes were compared in terms of quantum efficiencies. From the photoluminescence analysis, the erbium doped lead borosilicate glasses well suited for optical fiber amplifiers are discussed. The rare earth ions exhibit interesting phenomenon such as shielding effect and hypersensitivity so they have been extensively used in various laser technology applications. [1] The materials incorporated with various rare earth ions can show intense emissions starting from ultraviolet (UV) to near infrared (NIR) regions due to their intra 4f-4f and 4f-5d transitions under various excitation wavelengths. [2] Each rare earth ion has its own significance in the respective field, like dysprosium (Dy 3+ ) doped materials are widely used in the generation of white light and in energy efficient display devices. In the present study, researchers concentrated on erbium ion (Er 3+ ) doped glassy materials since they exhibit intense emission transitions such as 2 H 11/2 ! 4 I 15/2 , 4 S 3/2 ! 4 I 15/2 , 4 F 9/2 ! 4 I 15/2 and 4 I 13/2 ! 4 I 15/2 which could be useful in temperature sensors, solar cell and in the telecommunication field as broadband amplifiers for the S (1480-1520 nm), C (1527-1563 nm) and L (1570-1610 nm) band regions. [3] In addition, trivalent erbium doped glassy materials are very useful for eye safe lasers, particularly for fiber amplifiers in the wavelength division-multiplexing (WDM) communication networks. [4][5][6] After searching several hosts, lead borosilicate (LBS) glass is identified as a suitable host because of low phonon energy, good transparency and large rare earth ion solubility. In these multi-components, boron trioxide (B 2 O 3 ) is a good glass former and provides ultra fine trans...

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Quantum efficiency and excited-state relaxation dynamics in neodymium-doped phosphate laser glasses

Cited by 199 publications

References 42 publications

Effect of annealing and Nd concentration on the photoluminescence of Nd3+ ions coupled with silicon nanoparticles

Effect of annealing and Nd concentration on the photoluminescence of Nd3+ ions coupled with silicon nanoparticles

Influence of temperature and excitation procedure on the athermal behavior of Nd3+-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements

Effect of erbium ion concentration on structural and luminescence properties of lead borosilicate glasses for fiber amplifiers

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