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  • Books
  • Articles  (9)
  • American Institute of Physics (AIP)  (9)
  • 1990-1994  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Beam divergence effects on nonlinear frequency mixing (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1091-1101 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of the beam divergence of the input pump laser beams on the nonlinear frequency mixing process in a dielectric medium is discussed. The divergent laser beams have finite angular spreads so that all of the interactions between the two input beams can never satisfy the phase-matching condition exactly. A numerical model is developed to investigate the effects of input beam divergence on conversion efficiency. The angular spread of each of the input beams is represented by a set of plane waves having a distribution of propagation directions. Each of the plane-wave components from one input beam is allowed to interact with all the plane-wave components of the second input beam. This model is applicable to processes such as sum frequency generation, difference frequency generation, and optical parametric amplification. Second-harmonic generations as a special case of sum frequency generation is used as an example in the numerical studies. Results indicate that the conversion efficiency is dependent on the amount of beam divergence, the input intensity, and the length of the nonlinear medium. These parameters must be optimized with respect to one another to maximize the conversion. The optimization is especially critical in high-power systems where high conversion efficiency is sought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351272
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  • 2
    Electronic Resource
    Electronic Resource
    Radius and current scaling of argon K-shell radiation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2781-2788 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Argon gas puff experiments on a 3–4 MA generator show that the K-shell x-ray yield is optimized for a 2.5 cm initial diameter and 110 ns implosion time. By varying the driver current, the K-shell yield varies from 13 to 18 kJ following a current to the fourth power scaling. Comparisons of these experimental data to one-dimensional radiation-hydrodynamic simulations with and without enhanced transport coefficients show that the measured K-shell yields exceed those predicted based solely on kinetic energy input.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356217
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  • 3
    Electronic Resource
    Electronic Resource
    Eye-safe Nd:YAG laser (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 650-652 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have demonstrated that a significant amount of laser energy can be extracted at 1.4444 μm from Nd:YAG at room temperature. The stimulated emission cross section at 1.4444 μm is not unduly small. More than 1 J of laser energy in the non-Q-switched mode and over 130 mJ with a pulse width of 85 ns full width at half maximum in the Q-switched mode have been obtained. The 1.4444 μm laser has also been operated successfully at repetition rates up to 10 Hz at the 100 mJ/pulse level. Other lasing transitions at 1.064, 1.3187, 1.3381, 1.3572, and 1.4150 μm have also been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103621
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  • 4
    Electronic Resource
    Electronic Resource
    AlGaAs/GaAs-based triangular-shaped ring ridge lasers (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1658-1660 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Triangular-shaped ring ridge lasers (ridge trilasers) have been fabricated using quantum-well semiconductor laser material. The spectra of these ridge trilasers show single-wavelength operation above threshold confirming traveling-wave behavior in these lasers. Unidirectional operation is reported based on asymmetry between the clockwise and counterclockwise directions, in contrast to conventional unidirectional operation in ring lasers based on magnetic techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107228
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  • 5
    Electronic Resource
    Electronic Resource
    Etched-facet AlGaAs triangular-shaped ring lasers with output coupling (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1395-1397 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Total and partial reflection are demonstrated at the bends of V-shaped lasers. By varying the angle of incidence to the facet at the bend, the reflectivity at this facet can be changed. Two totally and one partially reflecting V-shaped lasers are combined in a unibodied structure to realize a triangular-shaped ring laser (trilaser). Trilasers are made of three sections which meet at three facets. Two of the facets provide total internal reflection while the third allows partial transmission from which light output is obtained. The Q of the resultant planar cavity is modified by geometry, without the need for facet coating. V-shaped lasers and trilasers are formed by using the chemically assisted ion beam etching technique in an AlGaAs/GaAs-based single quantum well graded-index separate confinement heterostructure material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105317
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  • 6
    Electronic Resource
    Electronic Resource
    Oxygen tracer diffusion through BaF2 and MgO overcoats on YBa2Cu3O7−Δ (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 724-726 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The movement of oxygen through MgO and BaF2 overcoats on YBa2Cu3O7−Δ has been studied using 18O tracer diffusion techniques. By analyzing the 18O and 16O signals from secondary-ion mass spectrometry depth profiles, the motion of small concentrations of oxygen in both insulating and oxygenated hosts has been tracked. BaF2 was found to be 〈m1;37p〉transparent to oxygen diffusion while MgO blocked its motion during 10 min 500–600 °C anneals. Uncovered YBa2Cu3O7−Δ films were also found to exchange up to 90% of their oxygen during similar anneals. These results have important ramifications for reoxygenation steps during device fabrications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105377
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  • 7
    Electronic Resource
    Electronic Resource
    Potential well formation by injection of electrons with various energy distributions into a sphere or a slab (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 4140-4152 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The details of the potential well structure produced by the injection of electrons from high-energy electron guns is studied as a function of the energy, velocity spread, and density of injected electrons. The effect of geometry, slab versus sphere, is also calculated. A motivation for the study is that some devices that attempt to produce fusion reactions from the acceleration of ions by an electric potential use energetic injected electrons to produce the potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860321
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  • 8
    Electronic Resource
    Electronic Resource
    A nonlocal theory of counterstreaming ion instability (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1706-1714 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spherically convergent ion focus (SCIF) devices relying on hot electrons to create the confining electrostatic well are found to be subject to a counterstreaming ion instability. Nonlocal linear stability theories in a spherical geometry are formulated and solved both analytically and numerically. The results of previous calculations of local linear theory are used for comparison. Linear growth rates of the order of the beam transit frequency are predicted. The consequence of these instabilities awaits a nonlinear treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860805
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  • 9
    Electronic Resource
    Electronic Resource
    The specific volumes of Pd40Ni40P20 in the liquid, glass, and crystallized states (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5410-5414 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The specific volumes of Pd40Ni40P20 were measured in the liquid, glass, and crystallized states. It was found that in the molten state, for temperatures below ∼1000 K, the specific volume measurement was successful only if the specimens were properly purified. Such purification could be achieved by fluxing the molten specimen in dehydrated boron oxide. Relaxation effects are observed and they manifested themselves in the variation of the thermal expansion coefficient with the quenching rates of the glassy specimens. The intersection points of the specific volume curves of the liquid (both stable and metastable), glass and crystallized are 573±80 and 492±80 K (extrapolated values), respectively. The former agrees very well with the glass transition temperature 577 K, obtained by the calorimetry method, while the latter implies that the melt, in accord with free volume theory, will have collapsed to the glass before that temperature is reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355286
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