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  • 11
    Electronic Resource
    Electronic Resource
    Ultrashort-pulse propagation in dye laser amplifiers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 530-540 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A semiclassical model is presented for ultrashort-pulse dye laser amplifiers. The model permits a discussion of important aspects of short-pulse amplification such as pulse shape, pulse energy, and gain saturation. Coherence effects are found to be important in characterizing the evolution of amplified pulses in the subpicosecond and femtosecond regimes. The results are compared with those obtained using the corresponding rate equation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353363
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  • 12
    Electronic Resource
    Electronic Resource
    Pump polarization effects in cw dye lasers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 8005-8010 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of pump polarization on the performance of cw dye lasers have been investigated. A recently developed semiclassical model for synchronously pumped mode-locked dye lasers is adapted to the problem of cw dye-laser oscillation, and analytic expressions are obtained for the relationship between the pump power, pump polarization, and dye-laser output power. The theoretical results are compared with experimental data obtained using an argon-laser-pumped rhodamine 6G dye laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347496
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  • 13
    Electronic Resource
    Electronic Resource
    Comparisons of gyrofluid and gyrokinetic simulationsf| (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1461-1468 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The gyrokinetic and gyrofluid models show the most promise for large scale simulations of tokamak microturbulence. This paper discusses detailed comparisons of these two complementary approaches. Past comparisons with linear theory have been fairly good, therefore the emphasis here is on nonlinear comparisons. Simulations include simple two-dimensional slab test cases, turbulent three-dimensional slab cases, and toroidal cases, each modeling the nonlinear evolution of the ion temperature gradient instability. There is good agreement in both turbulent and coherent nonlinear slab comparisons in terms of the ion heat flux, both in magnitude and scaling with magnetic shear. However, the nonlinear saturation level for ||Φ|| in the slab comparisons shows differences of approximately 40%. Preliminary toroidal comparisons show agreement within 50%, in terms of ion heat flux and saturation level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870696
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  • 14
    Electronic Resource
    Electronic Resource
    Recent experiments with liquid gallium cooling of crystal diffraction optics (abstract)a) : Proceedings of the 4th International Conference on Synchrotron Radiation Instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 485-485 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The x-ray beams for the next generation of synchrotrons will contain much more power (1–10 kW) than is available at present day facilities. Cooling the first optical components in these beam lines will require the best cooling technology that one can bring to bear. Argonne continues to pioneer the use of liquid metals as the cooling fluid and has adopted liquid gallium as the liquid metal of choice. Its low melting point, 29.7 °C and its very low vapor pressure make it an easy fluid to handle and its high thermal conductivity and heat capacity make it an excellent cooling fluid. A series of experiments were performed during April 1991 with the wiggler beam at the F2 station of the CHESS facility at Cornell to investigate the cooling of large areas of high power. Two types of cooling crystal geometries were tested, one where the cooling channels were core-drilled just below the surface of the crystal and a second where slots were cut into the crystal just below the surface with a diamond saw. Both crystals performed well with beam powers up to 1050 W and power densities of up to 14.5 W/mm2 at normal incidence.An infrared camera was used to measure the variation in the temperature of the top layer of the silicon crystals. For the core-drilled crystal the peak temperature measured at the center of the beam at a power density of 12.3 W/mm2 was 15 °C hotter than the crystal surface outside of the beam with a flow of liquid gallium of 2 gpm (gallons per minute) and was 10 °C with a flow of 4 gpm. The maximum distortion of the crystal surface distortion of the core drilled crystal was about ±2.0 arcsec for the 2 gpm case with a maximum power density of 10.9 W/mm2 and about 5% of the expected beam intensity was lost at peak power of 14.5 W/mm2. For the slotted crystal the peak temperature difference for a peak power of 10.9 W/mm2 was 3.5 and 2.0 °C for liquid gallium flows of 1 and 2 gpm, respectively. No intensity loss was measured for the maximum power density of 14.5 W/mm2. The fact that the peak temperature differences on the surface of both crystals was decreasing with increased flow of liquid gallium suggests that even higher power densities can be accommodated with higher flows of liquid gallium. This work is supported by the Department of Energy, BES-Materials Sciences, under Contract W-31-109-Eng-38.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142738
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  • 15
    Electronic Resource
    Electronic Resource
    Fluttering fountains: Stability criteria (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4892-4894 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fluttering oscillations that have long been seen in falling sheets of water have recently been subjected to detailed theoretical analysis. In this study stability criteria for these oscillations are derived and discussed. These criteria provide insight into the physical mechanisms of the instability and may be employed in the design of fluttering waterfall systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355775
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  • 16
    Electronic Resource
    Electronic Resource
    Magnetic properties of sintered Alnico 5 magnet via rapid solidification technology : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6655-6657 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A process for making Alnico magnets (grade 5–8) via rapid solidification technology has been developed. The process includes extractive melt spinning of alloy powders, press forming, heat treatment under a magnetic field, and aging. The Alnico 5 magnets made by this process showed superior magnetic properties to those of cast magnet of the corresponding composition. The superior magnetic properties of the sintered magnets with Br=13.2 kG, Hc=680 Oe, and (BH)max=6.02 MGOe are due to the spinodal decomposition which is completely free of γ phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356885
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  • 17
    Electronic Resource
    Electronic Resource
    Threshold characteristics of multimode semiconductor lasers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 737-747 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of spontaneous emission on the threshold characteristics of multimode laser oscillators with mixed line broadening are considered in detail. Most previous studies of multimode laser operation have emphasized the two limits of homogeneous and inhomogeneous broadening. With homogeneous broadening there is a tendency for oscillation in a single longitudinal mode, while in the inhomogeneous limit oscillation over much of the gain spectrum is expected. All practical lasers are somewhere between these limits, and this study explores the mode characteristics of lasers with mixed line broadening. Special attention is given to the important practical case of semiconductor diode lasers, and band-to-band absorption is fully included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356474
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  • 18
    Electronic Resource
    Electronic Resource
    Line shape of electromodulation in uniform electric field of δ-doped GaAs (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7489-7492 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The line shape of electromodulation in uniform electric field of δ-doped GaAs has been calculated and compared with the experiments. The calculations show that the Franz–Keldysh oscillations (FKO) beats observed in experiments are contributed form the interference of heavy-hole and light-hole transitions. The calculations also show that the linear equation of extrema is a good approximation to analyze the electric field from the FKO line shape, although the equation only considers the heavy-hole transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356620
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  • 19
    Electronic Resource
    Electronic Resource
    Crystal structure and low-temperature magnetic properties of melt-spun Sm2Co7B3 compounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6274-6276 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature magnetic properties and crystal structures of melt-spun Sm2Co7B3 compound were characterized. The magnetic measurements in the temperature range 77–450 K indicated that a spin reorientation took place at about 150–160 K. A huge anisotropy was observed (Ha=135 kOe at 300 K, 725 kOe at 77 K) for Sm2Co7B3, although the magnetic moment is rather low. The crystal structure of the Sm2Co7B3 compound was analyzed in detail by Rietveld analysis of powder diffraction for the first time, and revealed that B(4h) atoms are not placed in the Sm(2e) layer but in between the Sm(2e) and Co(6i1) layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355422
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  • 20
    Electronic Resource
    Electronic Resource
    Optically stabilized AlxGa1−xAs/GaAs laser using magnetically induced birefringence in Rb vapor (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 995-997 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Narrow-band optical feedback is an effective method of reducing the linewidth and stabilizing the frequency of diode lasers. We have constructed an optically stabilized AlxGa1−xAs/GaAs laser using a rubidium vapor cell immersed in a dc magnetic field as an optical feedback element. The diode laser's frequency locks to sub-Doppler features of the rubidium spectrum and exhibits a reduction in linewidth from 30 MHz to 35 kHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105214
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