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  • AIP Publishing  (20)
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  • AIP Publishing  (20)
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  • 1
    Online Resource
    Online Resource
    Intense upconversion and infrared emissions in Er3+–Yb3+ codoped Lu2SiO5 and (Lu0.5Gd0.5)2SiO5 crystals
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 93, No. 1 ( 2008-07-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 93, No. 1 ( 2008-07-07)
    Abstract: High optical quality Lu2SiO5 (LSO) and (Lu0.5Gd0.5)2SiO5 (LGSO) laser crystals codoped with Er3+ and Yb3+ have been fabricated by the Czochralski method. Intense upconversion (UC) and infrared emission (1543nm) are observed under excitation of 975nm. The luminescence processes are explained and the emission efficiencies are quantitatively obtained by measuring the UC efficiency and calculating the emission cross section. The temperature-dependent optical properties of the crystals are also investigated. Our study indicates that Er3+–Yb3+:LSO and Er3+–Yb3+:LGSO crystals are promising gain media for developing the solid-state 1.5μm optical amplifiers and tunable UC lasers.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2954010
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Laser repointing scheme for octahedral spherical hohlraum s on the SGIII laser facility
    AIP Publishing ; 2023
    In:  Physics of Plasmas Vol. 30, No. 4 ( 2023-04-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 30, No. 4 ( 2023-04-01)
    Abstract: The novel octahedral spherical hohlraum can provide an ideal and practical approach for the next generation of laser systems to support both direct and indirect drive to achieve predictable and reproducible fusion gain via multiple schemes. To demonstrate its advantage in a naturally high symmetry at a cylindrically configured laser facility, it requires to repoint the laser beams to approach as close as possible the ideal octahedral beam configuration with an injection angle (the angle between a beam and the normal direction of its laser entrance hole (LEH)) ranging from 50° to 60°. We report our investigation and experiment on the optimum repointing scheme at the SGIII facility, which uses 32 beams, with 8 beams entering each polar LEH at 49.5° and 55°, and 4 beams entering each equatorial LEH at 61.5° and 62.1°. It contains residual imbalance between the polar and equatorial beams, leading to an asymmetry dominated by the spherical harmonic Y20 mode, which can be remarkably reduced by the stronger backscatters of equatorial beams. Our experiment demonstrated the feasibility of the 32-beam optimum repointing scheme and generation of 175 eV under 86 kJ inside a 2.4-mm-radius octahedral hohlraum with 0.7-mm-radius LEHs, which provided a strong support for the later experiment on proof-of-concept of octahedral spherical hohlraum [Lan et al., Phys. Rev. Lett. 127, 245001 (2021)]. 2D simulations on LEH closure agree well with the observations. This work opens a novel way of realization of a quasi-spherical irradiation at a cylindrically configured laser facility without supplementary symmetry control.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0133806
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472746-8
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Experimental study of drop impact on a thin fiber
    AIP Publishing ; 2019
    In:  Physics of Fluids Vol. 31, No. 10 ( 2019-10-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 31, No. 10 ( 2019-10-01)
    Abstract: In this paper, we present an experimental study of drop impact on a thin flexible fiber. Detailed dynamics of the collision was captured with a high-speed video camera. Previous studies have presented three modes: capturing, single drop falling, and splitting. However, in our experiments, we observed that a low-speed drop could bounce off a thin fiber. Moreover, the splitting mode was segmented into two different types: low-speed splitting and high-speed splitting. Based on systematic experiments, we rebuilt a regime map consisting of capturing, low-speed splitting, single drop falling, and high-speed splitting. Both the upper and the lower limits of the low-speed splitting were presented. Fiber wettability was found to play an important role in the impact results. Low-speed splitting vanished when a water drop impacts on a nylon fiber coated with a layer of hydrophilic material. Meanwhile, a theoretical model was proposed to predict the fiber dynamics, which fitted well with the experimental results.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.5116845
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 4
    Online Resource
    Online Resource
    Tunnel-regenerated multiple-active-region light-emitting diodes with high efficiency
    AIP Publishing ; 2001
    In:  Applied Physics Letters Vol. 79, No. 18 ( 2001-10-29), p. 2985-2986
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 79, No. 18 ( 2001-10-29), p. 2985-2986
    Abstract: Tunnel-regenerated multiple-active-region (TRMAR) light-emitting diodes (LEDs) with high quantum efficiency and high brightness have been proposed and fabricated. We have proved experimentally that the efficiency of the electrical luminescence and the on-axis luminous intensity of such TRMAR LEDs scaled linearly approximately with the number of the active regions. The on-axis luminous intensity of such TRMAR LEDs with only 3 μm GaP current spreading layer have exceeded 5 cd at 20 mA dc operation under 15° package. The high-quantum-efficiency and high-brightness LEDs under the low injection level were realized.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1415041
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2001
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Large bubble entrapment during drop impacts on a restricted liquid surface
    AIP Publishing ; 2012
    In:  Physics of Fluids Vol. 24, No. 5 ( 2012-05-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 24, No. 5 ( 2012-05-01)
    Abstract: The behavior of millimetric drops impacting on a gas-liquid interface restricted by surrounding walls is studied using a high-speed video camera. A novel phenomenon of large bubble entrapment is observed in experiments. It is found that the large bubble formation is not only dependent on the impact velocity of the drop, but also the shape of drop at the moment of contact with the liquid surface and the distance from the impact point to surrounding walls.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.3703674
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 6
    Online Resource
    Online Resource
    Enhanced piezoelectric and antiferroelectric properties of high- TC perovskite of Zr-substituted Bi(Mg1/2Ti1/2)O3-PbTiO3
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 112, No. 7 ( 2012-10-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 112, No. 7 ( 2012-10-01)
    Abstract: Bi(Mg1/2Ti1/2)O3-PbTiO3 is a promising high-TC piezoelectrics in the Bi-based perovskite family of BiMeO3-PbTiO3. In this study, zirconium is utilized to further improve the high temperature piezoelectric properties of Bi(Mg1/2Ti1/2)O3-PbTiO3. Substitution of Zr for Ti is observed to decrease the tetragonality (c/a) near the morphotropic phase boundary, while TC can be well maintained by the substitution of smaller and ferroelectrically active Ti by a larger and ferroelectrically weaker Zr cation. A softer coercive field and enhanced domain mobility is observed, ultimately leading to a strong ferroelectric activity. The piezoelectric property of Zr-substituted Bi(Mg1/2Ti1/2)O3-PbTiO3 is enhanced to 260 pC/N, when compared with Bi(Mg1/2Ti1/2)O3-PbTiO3 (225 pC/N). Good high temperature piezoelectric property was found in the tetragonal phase of Zr-substituted Bi(Mg1/2Ti1/2)O3-PbTiO3. Thermal depoling of aligned domains for this composition occurs at approximately 300 °C. Thus, Zr-substituted Bi(Mg1/2Ti1/2)O3-PbTiO3 could be used for high temperature actuator applications. Furthermore, an apparent ferroelectric-antiferroelectric phase transition was observed as a function of both the composition in the rhombohedral phase and the temperature. An antiferroelectric relaxor exists in the Zr-substituted Bi(Mg1/2Ti1/2)O3-PbTiO3.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4755790
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Secondary cavitation in a rigid tube
    AIP Publishing ; 2017
    In:  Physics of Fluids Vol. 29, No. 8 ( 2017-08-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 29, No. 8 ( 2017-08-01)
    Abstract: The oscillation of a single spark-generated bubble in a rigid tube is studied experimentally, with the help of a high-speed camera and a hydrophone. The non-dimensional collapse position XF is divided into three regimes, according to the various phenomena after the first oscillation period T1. In an asymmetric regime, secondary cavitation is observed. Both the axial position and the oscillation period of the secondary cavitation show a linear correlation with the first bubble. The period ratio k is independent of the relative bubble size L1* but is affected by the tube diameter Dt. In a symmetric regime, the secondary cavitation is much weaker and unrepeatable. The rebound bubble is strengthened in this regime, and the rebound ratio kr is independent of both L1* and Dt. A mechanism of reflected rarefaction wave is proposed to explain the position relation between the first and secondary cavities, and the energy partition in different regimes is discussed.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.4990471
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 8
    Online Resource
    Online Resource
    A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions
    AIP Publishing ; 2019
    In:  Review of Scientific Instruments Vol. 90, No. 9 ( 2019-09-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 90, No. 9 ( 2019-09-01)
    Abstract: A low-energy, compact, and superconducting electron beam ion trap (the Shanghai-Wuhan EBIT or SW-EBIT) for extraction of highly charged ions is presented. The magnetic field in the central drift tube of the SW-EBIT is approximately 0.21 T produced by a pair of high-temperature superconducting coils. The electron-beam energy of the SW-EBIT is in the range of 30–4000 eV, and the maximum electron-beam current is up to 9 mA. Acting as a source of highly charged ions, the ion-beam optics for extraction is integrated, including an ion extractor and an einzel lens. A Wien filter is then used to measure the charge-state distribution of the extracted ions. In this work, the tungsten ions below the charge state of 15 have been produced, extracted, and analyzed. The charge-state distributions and spectra in the range of 530–580 nm of tungsten ions have been measured simultaneously with the electron-beam energy of 279 eV and 300 eV, which preliminarily indicates that the 549.9 nm line comes from W14+.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5112154
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 9
    Online Resource
    Online Resource
    Droplets passing through a soap film
    AIP Publishing ; 2017
    In:  Physics of Fluids Vol. 29, No. 6 ( 2017-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 29, No. 6 ( 2017-06-01)
    Abstract: Here, we report an experimental study of droplets colliding with a soap film. The behavior of the droplet is found to be dependent on the impact velocity. The threshold for a droplet to pass through the soap film is influenced by the droplet diameter. The contact time decreases with increasing impact velocity. Emphasis is placed on whether the outer shell remains intact. When the dimensionless contact time approaches 1, collapse of the shell begins. However, the shell does not collapse with further increasing impact velocity.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.4986798
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 10
    Online Resource
    Online Resource
    Capillary breakup of armored liquid filaments
    AIP Publishing ; 2017
    In:  Physics of Fluids Vol. 29, No. 6 ( 2017-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 29, No. 6 ( 2017-06-01)
    Abstract: An armored liquid filament is a liquid column wherein particles reside on the liquid-air interface rather than in the bulk of the filament, as is true of a suspension filament. Herein, the capillary breakup of armored liquid filaments is studied using a high-speed camera, where the thinning process can be divided into three stages: the armored liquid stage, the transition stage, and the liquid stage. At the armored liquid stage, the thinning is approximately uniform along the filament. In the transition stage, local deformation occurs and thinning is accelerated owing to the large curvature along the filament. Finally, at the liquid stage, the thinning behavior is similar to that of particle-free filaments. The main focus in the present work is on the armored liquid stage, wherein the volume density of particles in the liquid filament remains nearly constant. In addition, the relative distances between particles in the axial direction on the filament do not change at this stage. By defining an effective surface tension γeff, a model is established to estimate the neck thinning process at this stage.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.4984836
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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