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Dipolar Quantum Mixtures of Erbium and Dysprosium Atoms
摘要： We report on the first realization of heteronuclear dipolar quantum mixtures of highly magnetic erbium and dysprosium atoms. With a versatile experimental setup, we demonstrate binary Bose-Einstein condensation in five different Er-Dy isotope combinations, as well as one Er-Dy Bose-Fermi mixture. Finally, we present first studies of the interspecies interaction between the two species for one mixture.
关键词： erbium,dipolar quantum mixtures,Bose-Einstein condensation,interspecies interaction,dysprosium
更新于2025-09-23 15:21:21
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Effect of co-doping of lithium on the dosimetric properties of dysprosium-doped sodium borate glass system
摘要： The effect of lithium (Li) as a co-dopant on the Thermoluminescence (TL) properties of dysprosium-doped sodium borate (NB: Dy) exposed to two radiation sources (linear accelerator and Gamma-ray from Co-60) is reported in this study. The results showed an enhancement in the TL intensity with the increment of lithium to NB: Dy. Promising dosimetric properties were recorded; glow curve with simple and prominent peak, high signal stability and simple annealing process. Furthermore, the phosphor is reusable and high dose linearity range (up to 103 Gy). The current results propose the using of the new dosimeter in different dosimetric applications.
关键词： Borate glass,Dysprosium oxide,Dosimeter
更新于2025-09-19 17:15:36
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Spectroscopic properties of Dy3+- and Dy3+, B3+- doped SrAl2O4
摘要： The dysprosium and boron effect on the emission properties of europium-doped SrAl2O4 samples has recently attracted considerable attention due to their high brightness and long afterglow. Here, the influence of both cations, Dy3+ and B3+, on the spectroscopic properties of the europium free samples SrAl2O4:Dy3+ and SrAl2O4:Dy3+, B3+ has been investigated in order to get more insights concerning the mechanism by which they enhance the afterglow. Unique features have been observed in their excitation and emission spectra that show on one hand the lattice defects induced by the replacement of Sr2+ by Dy3+ and proves the existence of different crystallography sites for the Dy3+ ions and on the other hand, the local distortion of the energy levels of Dy3+ ions in the presence of B3+.
关键词： Doping,Persistent phosphors,Dysprosium,SrAl2O4,Boron,Phosphorescence
更新于2025-09-19 17:15:36
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Energy Transfer and Spectroscopic Investigation of Dy2O3 Doped Li2O–BaO–GdF3–SiO2 for White Light LED
摘要： LGFDy glasses doped with Dy2O3 (0.1, 0.5, 1.0, 1.5 and 2.0 mol %) were synthesised by conventional melt quenching method and various properties are studied by absorption, Judd–Ofelt analysis, photoluminescence, X-ray excited luminescence, decay curve and CIE color chromaticity measurement. Judd-Ofelt parameters (?2, ?4 and ?6) are valuated form JO theory in order to estimate the radiative parameters of the Dy3+ ion excited states. For white light emission, Yellow/Blue (Y/B) ratio and CIE color coordinates for glasses under study are measured from the emission spectra. The energy transfer from Gd3+ to Dy3+ ions has been studied by exciting the glass with 275 nm photon. The higher value of σ (λp) and βR for 4F9/2 → 6H13/2 transition indicates its more potential use in laser application in yellow region. The correlated color temperature for LGFDy glasses is found to be 4264 K. The decay profile of fluorescent level 4F9/2 for different concentration of Dy3+ ions in the present glasses changes to non-exponential from single-exponential for higher concentration (≥0.5 mol %) of Dy3+ ions. Thus the chemical composition of glass and dopant (Dy3+ ions) concentration strongly influence the energy transfer mechanism. The lifetime non-exponential behavior is well fitted to IH-model for S = 6. The quantum efficiency for LBGFDy05 glass is found to be 86%. The systematic investigation signifies the potential of the studied LGFDy glasses for the laser and white light generation application.
关键词： silicate glasses,dysprosium,decay time,energy transfer,resonance energy transfer
更新于2025-09-19 17:13:59
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Dysprosium Mida??Infrared Lasers: Current Status and Future Prospects
摘要： With growing interest in the mid-infrared spectral region, dysprosium has recently been revisited for efficient high-performance infrared source development. Despite historically receiving less attention than other rare earth ions, in recent years lasers utilizing the dysprosium ion as the laser material have set record mid-infrared performance, including tunability from 2.8 to 3:4 μm (in addition to 4:3 μm lasing), continuous wave powers exceeding 10 W, greater than 73% slope efficiencies, and even ultrafast pulsed operation. Herein, the unique energy level structure and spectroscopy of the dysprosium ion are examined and the major developments that have led to this resurgence of interest and subsequent record mid-infrared laser performance are surveyed. Also mid-infrared applications of emerging dysprosium lasers are highlighted, in addition to surveying the many opportunities that lie ahead.
关键词： mid-infrared,dysprosium,fiber laser
更新于2025-09-19 17:13:59
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Dy 3+ -doped Ba-Na-B white light-emitting glass for w-LED applications
摘要： The Dy3+-doped barium sodium borate glasses with chemical composition 10BaO:25Na2O:(65-x)B2O3:xDy2O3 (where x = 0.50, 0.70, 1.00 and 1.50 mol%) were prepared by melt-quenching technique. The luminescence properties of the glass samples were studied to evaluate their potential for using as luminescence materials of w-LEDs applications. The density, molar volume and refractive index of the glass samples were carried out. The absorption spectra were investigated for UV-Vis and NIR regions in wavelength range 300 to 1900 nm. The excitation spectra measured under 575 nm emission wavelength showed peaks assigned by 6H15/2→4M17/2 (324 nm), 4I9/2 (336 nm), 6P7/2 (349 nm), 6P5/2 (363 nm), 4K17/2 (386 nm), 4G11/2 (424 nm), 4I15/2 (453 nm) and 4F9/2 (471 nm), the highest excitation peak centered at 349 nm. The emission spectra, excited with 349 nm excitation wavelength, showed the two major peaks assigned by 4F9/2→6H15/2 (482 nm, blue light emission) and 6H13/2 (575 nm, yellow light emission). The experimental lifetime were found to be 0.581, 0.441, 0.362 and 0.261 ms for 0.50, 0.70, 1.00 and 1.50 mol% of Dy2O3 doped in glasses, respectively. The color coordinates of all glass samples were found to be the same point at (0.38, 0.41) in the CIE 1931 chromaticity diagram and the CCT values of all glass samples were corresponding to the commercial cool white light (3100-4500K).
关键词： Color coordinates,CCT value,Borate glass,Dysprosium,Photoluminescence
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Generating Picosecond Pulses from Mid-Infrared Fiber Lasers using Frequency-Shifted Feedback
摘要： Ultrafast mode-locked ?ber lasers in the near infrared have enabled a host of key applications in a variety of ?elds such as medicine and defense. In recent years there has been signi?cant interest in pushing the emission wavelength of these ?ber laser systems to the mid infrared (MIR 3 - 5 μm) due to the presence of strong molecular absorption features in this spectral range. Various techniques to achieve this have been demonstrated, with a majority of the work focused on implementation of loss modulation via real saturable absorbers. While this has been successful in generating picosecond pulses in the mid-infrared [1], commercial availability of absorbers is currently limited, and alternatives such as nanomaterials (graphene, black phosphorous) raise questions regarding long-term stability. Virtual absorbers based on nonlinear polarization evolution have shown comparatively superior performance in terms of pulse duration [2] but this method is highly sensitive to small environmental perturbations. In this work we will present recent efforts to offer an alternative method of ‘mode-locking’ using frequency-shifted feedback (FSF) [3,4]. The method requires a frequency shifting element in the cavity, which in this case is an acousto-optic ?lter or modulator. Initial efforts are based on a dysprosium-doped ZBLAN ?ber laser pumped with an Er:ZBLAN ?ber laser (Fig. 1a). An acousto-optic tunable ?lter (AOTF) provides the requisite frequency shift and also a means of tuning the emission wavelength. The broad gain bandwith of dysprosium allows this system to be tuned over a range of 330 nm (Fig. 1b) with a pulse duration that remains consistent at 33 ps. Pulse formation dynamics are investigated numerically and will be presented with consideration to the various parameters that impact realized pulse duration. Of these it will be shown that a ?ltering effect is necessary in addition to the frequency shifting, with the AOTF providing this in the dysprosium case. Filter bandwidth is shown to in part dictate pulse duration, with a wider ?lter supporting shorter pulses. To investigate this we replace the dysprosium cavity with a similar holmium-doped system which replaces the AOTF with a simple acousto-optic modulator (AOM). The broader acceptance bandwidth of the AOM results in improved performance and a pulse duration of less than 5 ps (Fig.1 c-e), which surpasses the current record performance of mid-IR saturable absorber ?ber lasers systems.
关键词： holmium-doped system,frequency-shifted feedback,dysprosium-doped ZBLAN fiber laser,picosecond pulses,acousto-optic tunable filter,mid-infrared fiber lasers
更新于2025-09-12 10:27:22
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Gain-switched Dy3+:ZBLAN fiber laser operating around 3 μm
摘要： A gain-switched Dy3+-doped ZBLAN fiber laser operating at 2.943 μm is experimentally reported for the first time to the best of our knowledge. The laser was pumped by a 1.1 μm Q-switched ytterbium (III) fiber laser constructed in-house. A stable pulse train is achieved with repetition rates spanning between 25 and 100 kHz. For the repetition rate of 50 kHz, stable 183 ns pulses with an energy of 0.72 μJ and peak power of 4 W are recorded. By using a longer length of Dy3+-doped ZBLAN fiber, gain-switched operation was achieved at a wavelength larger than 3 μm.
关键词： Mid infrared sources,Mid infrared fiber laser,Dysprosium doped glass,pulse fiber laser
更新于2025-09-11 14:15:04
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - The Measurement System for the Giant Magnetostriction Material Based on the Laser Displacement Method
摘要： A measurement system is built to measure the magnetostrictive strain of giant magnetostrictionmaterial. The system based on the laser displacement method includes the dual laser devices, the electromagnet and the control unit. The system has the characteristics of non-contact, overall and accurate measurement. The electromagnet is used to generate the magnetic field of 5000 Oe. The magnetostrictive-strain curve of Terbium-dysprosium-iron (Terfenol-D) samples are measured. The uncertainty of magnetostrictive strain is less than 2.5% (k=2).
关键词： Terbium-dysprosium-iron,Giant magnetotrictive material,Laser displacement method,Non-contact,Terfenol-D,measurement,strain
更新于2025-09-11 14:15:04
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Quantum-enhanced sensing using non-classical spin states of a highly magnetic atom
摘要： Coherent superposition states of a mesoscopic quantum object play a major role in our understanding of the quantum to classical boundary, as well as in quantum-enhanced metrology and computing. However, their practical realization and manipulation remains challenging, requiring a high degree of control of the system and its coupling to the environment. Here, we use dysprosium atoms—the most magnetic element in its ground state—to realize coherent superpositions between electronic spin states of opposite orientation, with a mesoscopic spin size J = 8. We drive coherent spin states to quantum superpositions using non-linear light-spin interactions, observing a series of collapses and revivals of quantum coherence. These states feature highly non-classical behavior, with a sensitivity to magnetic fields enhanced by a factor 13.9(1.1) compared to coherent spin states—close to the Heisenberg limit 2J = 16—and an intrinsic fragility to environmental noise.
关键词： Heisenberg limit,Dysprosium atoms,Quantum-enhanced sensing,Non-classical spin states,Quantum metrology
更新于2025-09-10 09:29:36