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  • 1
    Electronic Resource
    Electronic Resource
    On the cooling of the plasma fireball produced by a laser spark in front of liquids and solids (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 631-638 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of experimental and theoretical investigation of the late, conductive–advective cooling of the fireball, produced by a laser spark in gas near a surface of condensed matter, are presented. The laser spark was initiated by the focusing of a 0.5 J 8 ns Nd:YAG laser. The fireball cooling rate was studied by using a fast frame camera and monochromatic imaging. A theoretical model is developed to describe the conductive–advective cooling stage. The model is reduced to a single nonlinear temperature diffusion equation. In the spherically symmetric case, a similarity solution found earlier is verified and employed for interpreting the experimental results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871890
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  • 2
    Electronic Resource
    Electronic Resource
    Miniature photoconducting capacitor array as a source for tunable THz radiation (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 2380-2385 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The prospects of a miniature photoconducting capacitor array as a source for THz radiation are discussed. The device consists of an alternately biased capacitor array built on a semiconductor substrate and illuminated by a short laser pulse. The laser pulse creates a propagating plasma front inside the crystal volume by side illumination, and triggers the discharging of the capacitor by shorting out the photoconducting material between each capacitor plate. The sequential discharge of the capacitor array inside the expending plasma region can be considered as an interaction between a static wave and a superluminous ionizing front. In the present article we have demonstrated production of two cycle pulses with a center frequency of up to 1.5 THz. The device combines elements from the well-known "frozen-wave" generator and from the photoconducting switches array. The underlying physics of this radiation mechanism is very similar to the dc-to-ac conversion mechanism inside a gas-filled capacitor array which generates coherent microwave radiation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150624
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  • 3
    Electronic Resource
    Electronic Resource
    Optimal x-ray source development in the spectral range 4–14 A(ring) using a Nd:YAG high power laser (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5598-5603 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental study was performed to find the optimal conditions for generating a few nanoseconds x-ray pulse source in the wavelength range 4–14 A(ring). X rays were emitted in a high-temperature plasma, which was created as the result of the interaction of a high power laser with a solid target. The experiments were done using 3–15 J, 1–10 ns, 1.06 μm pulses generated with a Nd:YAG laser. The x-ray yield and spectral distributions were studied as a function of the laser energy, temporal pulse width, pulse shape, and target material. For example, for samarium under optimal conditions, about 20% of the laser energy was converted into x rays in the wavelength range 8–12 A(ring). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363571
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  • 4
    Electronic Resource
    Electronic Resource
    Elimination of laser prepulse by relativistic guiding in a plasma (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 346-348 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method is proposed for eliminating prepulses associated with high-power ultrashort laser pulses. In this method the high-power portion of the pulse is refractively guided due to relativistic effects associated with the plasma electrons. The low-power prepulse, however, is unaffected and diffracts away. Optical guiding is achieved by appropriately choosing the plasma density, laser power, and wavelength. In addition, a wavebreaking stabilization mechanism for the Raman backscattering instability for intense laser pulses is proposed, which indicates that the pulse should not be significantly backscattered by the plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104653
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  • 5
    Electronic Resource
    Electronic Resource
    Multiple pulse laser excitation of capillary discharge (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2028-2029 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of a proof of principle experiment is presented to illustrate the utility of the capillary discharge as a medium for the efficient production of soft x-ray lasing. The duration of the capillary discharge plasma, 8 μs, is long enough to allow multiple pulses from a Q-switched mode-locked Nd glass laser to be used as a heating source to create a hot, relatively dense plasma several times per discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100311
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  • 6
    Electronic Resource
    Electronic Resource
    Rapid lattice expansion and increased x-ray reflectivity of a multilayer structure due to pulsed laser heating (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1873-1875 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spacing of layers in a sputtered, multilayer structure was rapidly and permanently increased by heating with a nanosecond laser pulse. During laser heating, the Bragg angle decreased and the peak reflectivity increased for diffraction of soft x-ray radiation at 4.4 nm. Measurements were made using a time and space resolving x-ray streak camera detector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98496
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of the electrical properties and thickness of thin epitaxial semiconductor layers by THz reflection spectroscopy (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5778-5781 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the dielectric properties and thickness of thin semiconductor epitaxy layers by the reflection of THz radiation from the surface of a two-layered semiconductor wafer. When reflecting from two interfaces the electromagnetic pulse has a destructive interference at a specific wavelength dependent on the thickness of the outer layer and its dielectric function. Near that frequency the reflection coefficient has a significant drop. By extending the incident pulse spectrum to include this interference frequency, a measurement of the thickness can be obtained together with a direct measurement of the carrier number density. By this technique epitaxy layers of thickness down to 15 μm are characterized. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1412574
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  • 8
    Electronic Resource
    Electronic Resource
    Point radiographic source characterization (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1671-1674 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study was undertaken to find the optimal conditions for generating x rays using a high-power frequency-doubled Nd laser pulse for x-ray backlighting application. More than 30 laser shots on the Lawrence Livermore National Laboratory JANUS Research Laser system have been studied. The following specific questions are addressed: (a) X-ray yield dependence on the laser parameters: (i) temporal pulse width and (ii) focusing conditions. (b) X-ray source size versus target dimensions by using a tungsten wire with various diameters. (c) Influence of background plasma on the x-ray yield from the wire using 25-μm wires surrounded by plastic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339590
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of energy penetration depth of subpicosecond laser energy into solid density matter (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 534-536 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The energy penetration depth characteristic of the interaction of intense subpicosecond (∼600 fs) ultraviolet (248 nm) laser radiation with solid density material has been experimentally determined. This was accomplished by using a series of ultraviolet transmitting targets consisting of a fused silica (SiO2) substrate coated with an 80–600 nm layer of MgF2. The measurement of He-like and H-like Si and Mg lines, as a function of MgF2 thickness, enabled the determination of the energy penetration depth. It was found that this depth falls in the range of 250–300 nm for a laser intensity of ∼3×1016 W/cm2. Based on numerical simulations, it is estimated that solid density material to a depth of ∼250 nm is heated to an electron temperature of ∼500 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105430
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  • 10
    Electronic Resource
    Electronic Resource
    High intensity generation of 9–13 A(ring) x-rays from BaF2 targets (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 777-778 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Studies of the interaction of condensed matter with short pulse (∼ 600 fs) high intensity (∼1017 W/cm2) ultraviolet (248 nm) radiation show that intense spatially compact sources for x-ray emission in the kilovolt range (0.5–1.0×1015 W/cm2) can be generated from solid targets at close to the maximum volume specific rate allowed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106384
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