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  • 1
    Electronic Resource
    Electronic Resource
    Time-resolved energy transfer and absorption bleaching measurements in CuCl microcrystallites (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2748-2751 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By degenerate pump and test measurements, we determine the coherence time and the lifetime of excitons in CuCl quantum dots. We show the importance of the induced recombination of coherent exciton states, excited in microcrystallites by two-photon absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354675
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of turbulent oxyacetylene flames used for diamond growth (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 755-759 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Turbulence in the flame of an oxyacetylene torch used for diamond growth was studied with mass spectrometry and dark-field shadowgraphy. H2, CO, N2, and C2H2 were observed in both laminar and turbulent diamond growing flames, while O2, CO2, and H2O were detected in only the turbulent flame. Dark-field shadowgraphs showed a broken, changing flame front in the turbulent flame, although the boundary layer remained laminar under all flow conditions. The broken flame front suggests that unburned gases are passing through the turbulent flame front to form the detected oxidation products. A model is proposed in which the gas phase environment above the surface in turbulent flame diamond growth oscillates between oxidizing and reducing conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353333
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  • 3
    Electronic Resource
    Electronic Resource
    Antithyroid antibodies underlying thyroid abnormalities and miscarriage or pregnancy induced hypertension (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To assess whether asymptomatic abnormalities, including thyroid auto-antibodies, were associated with an abnormal miscarriage rate or a poor obstetric outcome.Design Prospective study of thyroid auto-antibodies and thyroid function in an unselected obstetric population.Setting Saint-Pierrie Hospital, Brussels, Belgium.Subjects Seven hundred and thirty consecutive pregnant women attending the antenatal clinic.Main outcome measures Miscarriage and pregnancy induced hypertension.Results Elevated antithyroperoxidase (TPO-Ab) and antithyroglobuline (TG-Ab) antibody titres are associated with an increased miscarriage rate. Also, asymptomatic thyroid abnormalities, mainly abnormal echostructure but not antithyroid antibodies, are associated with pregnancy induced hypertension.Conclusion The presence of thyroid auto-antibodies during pregnancy constitutes a marker of increased risk of miscarriage and poor obstetric prognosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb14236.x
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  • 4
    Electronic Resource
    Electronic Resource
    Picosecond spectral hole burning in ZnCdTe layers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4632-4636 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spectral and temporal behavior of absorption bleaching due to band- and state-filling processes in Cd1−xZnxTe polycrystalline layers with a nominal composition x=0.17 are investigated. The absorption bleaching due to band-filling effects has a decay time in the range of 35 and 90 ps which depends on the photon energies of the pump and test beams. It is attributed to the relaxation of quasi-Fermi levels through the bottom (top) of the conduction (valence) band and corresponds to the lifetime of nonequilibrium charge carriers. The absorption bleaching due to state-filling processes corresponds to the nonthermal part of the energy distribution of free carriers and therefore depends on the photon energy of the pump beam. A hole burning is found which peaks near the photon energy of the pump laser and which follows the temporal shape of the laser pulses (20 ps). The asymmetry of the hole-burning spectrum is attributed to the energy dependence of the density of states which is important for electron–electron scattering processes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363457
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  • 5
    Electronic Resource
    Electronic Resource
    Carrier diffusion in porous silicon studied by transient laser-induced grating spectroscopy (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2481-2486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report laser-induced transient grating experiments performed at room temperature on self-supporting p-type porous silicon films with different porosities. With this technique the diffusion of the photocarriers can be studied with a time resolution of some tens of picoseconds. The gratings were created by two interfering pulses of the second-harmonic radiation from an Nd3+:yttrium-aluminum-garnet YAG laser (2.3 eV) and their decay in time was studied by a time-delayed pulse of the fundamental YAG laser frequency (1.15 eV). The observed grating decay time is very fast (hundreds of picoseconds) and shortens with decreasing porosity. Diffusion constants D=45, 24, and 5 cm2 s−1 have been found for the porosities of 64%, 68%, and 73%, respectively. To explain these high values of D we consider a simple kinetic model which takes into account two different types of carriers, delocalized and trapped ones. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361177
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  • 6
    Electronic Resource
    Electronic Resource
    Small-scale laboratory measurement and simulation of a thermal precursor shock (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 2420-2427 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A shock precursor in a thin thermal layer above a 3000 K hot surface is measured in a small-scale laboratory experiment. Precursor and thermal layer characteristics are diagnosed using spectroscopy, interferometry, and dark-field shadowgraphy. The experiment is successfully simulated with a code previously validated using large-scale high-explosive tests, thereby demonstrating its applicability to events that differ in energy by 12 orders of magnitude. The simulation shows that a small-scale laboratory experiment can be a good surrogate for infrequent, expensive, and hard to diagnose large-scale tests. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367001
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  • 7
    Electronic Resource
    Electronic Resource
    Transverse effects and slowing down in the switching dynamics of induced absorption optical bistability (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 685-687 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The switching dynamics of photothermal-induced absorption optical bistability is studied in CdS. The bistable element being held near its switching threshold is switched by a pulse of an excimer laser, which can be regarded as δ shaped in time with respect to the thermal relaxation time of the sample. The dynamics of the switching process is influenced by the transverse relaxation of the temperature in the sample. Under appropriate conditions either a slowing down or a fast switching is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99347
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  • 8
    Electronic Resource
    Electronic Resource
    Flash x radiography of laser-accelerated foils (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 131-141 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The successful compression of laser-driven pellets to thermonuclear ignition depends on the stability and uniformity of the motion with which dense shells can be imploded. The motion of planar foils accelerated by the Pharos II laser has been studied by two-dimensional, flash x radiography employing pinhole imaging and slitted crystal imaging. The acceleration was driven by a 3–5-ns duration, 1.05-μm laser focused to 3–6×1012 W/cm2 in a millimeter diameter spot, while a second laser beam of shorter duration produced the x-ray flash for imaging purposes. The x-ray images obtained clearly show that the planar foil targets are ablatively accelerated to velocities of 3×106 cm/s while maintaining a density above 3% of solid. The axial extent of the accelerated, high-density material has been observed to be as small as 25% of the distance traveled. The sides of accelerated portions of the foil connect smoothly to the stationary regions removed from the laser illumination. This connection apparently isolates the rear surface from the hot ablation plasma and helps explain the low rear surface temperatures which have been observed. The overall appearance of the accelerated foil is localized and nearly planar at early times when it has moved distances small compared to its diameter. The x-radiographic results are in general agreement with two-dimensional hydrodynamic simulations and with earlier Naval Research Laboratory studies of target motion, ablation pressures, and symmetrization employing other diagnostics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338845
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  • 9
    Electronic Resource
    Electronic Resource
    X-ray damage in optical coatings : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 795-797 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Thin film coatings are susceptible to high intensity x-ray damage. The PHAROS III laser was utilized to generate a point source of x-ray emission used to determine the damage threshold of AR-coated space optics. Thin filters coupled with magnets were used to shield the specimens from thermal radiation and plasma debris. Grids supporting the thin filters could be patterned into the coatings. The surface morphology of damaged specimens has been examined with SEM and AFM microscopes to determine the nature of the damage in multilayer AR coatings. Microscopic techniques were used to measure the depths of coating damage and edge sharpness in the patterned region. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146224
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamics of beam defocusing and induced absorption in CdZnTe alloys (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1720-1722 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the optical nonlinear properties of bulk Cd0.13Zn0.87Te monocrystals at room temperature near the band gap. In time-resolved test and pump experiments, they manifest themselves by a defocalization and an induced absorption of the test beam in the presence of the pump beam. By measuring the spatial intensity profile of the test pulse transmitted through the sample, we determine the real and the imaginary parts of the refractive index as functions of the photon energy and time delay between pump and test pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111790
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