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  • 42.60  (32)
  • Springer  (32)
  • American Institute of Physics (AIP)
  • National Academy of Sciences
  • 1985-1989  (32)
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Keywords
Publisher
  • Springer  (32)
  • American Institute of Physics (AIP)
  • National Academy of Sciences
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Experimental study of laser induced decomposition based processing of a brittle plastic, CR-39 (allyl diglycol carbonate) (1985)
    Springer
    Applied physics 36 (1985), S. 19-25 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 61.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A cw CO2 laser, coupled with an astigmatism free beam focussing mirrors arrangement is used for processing a brittle plastic, CR-39 without producing cracks, vents or chips. The processing is based on the formation of volatile products of laser-induced decomposition in the plastic. Threshold fluence for the decomposition (found to be independent of the power density and beam residence time) in CR-39 atλ=10.6μm is determined to be 25 J cm−2 and the decomposition threshold power density for cw irradiation 2.1±0.5 W cm−2. The depth and width of the tapered laser processed region are observed to increase with power density and beam residence time. The widths attain a steady state value of ∼ 1 mm at beam residence time above 65 ms, for a fixed power density (2.5×104 W cm−2) and sheet thickness (250 μm). Taper angle of the edges decreases with increasing power density and/or beam residence time. The heat affected zone (measured in crossed polarisers) around the processed region is found to extend with increasing beam residence time but remains unaffected on changing power density. The results are discussed in terms of the optical and thermophysical properties of CR-39 and the parameters of the interacting laser beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616455
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  • 2
    Electronic Resource
    Electronic Resource
    Computer controlled diode laser spectrometer with a helium evaporation cryostat and spectroscopy of thev 3 vibration of NCO (1989)
    Springer
    Applied physics 48 (1989), S. 105-110 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 33.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A computer-controlled diode laser spectrometer for the 1200 to 2500 cm−1 spectral region is described. The spectrometer has been applied to high resolution spectroscopy of the NCO radical at 5.2 μm. The lead-salt diode lasers are cooled to their operating temperature with a temperature adjustable helium evaporation cryostat. Computer-controlled tuning procedures for the frequency tuning of the diode lasers have been developed; they are independent of tables describing the tuning characteristics of the diode lasers. 41 lines of the antisymmetric stretching-vibrationv 3 of the linear NCO radical have been observed. We were able to detect vibration-rotation transitions in both2 π 1/2 and2 π 3/2 fine structure sublevels. These measurements led to the precise determination of additional molecular constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692134
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  • 3
    Electronic Resource
    Electronic Resource
    Performance of a Nd: YAG oscillator/ampflifier with phase-conjugation via stimulated Brillouin scattering (1985)
    Springer
    Applied physics 36 (1985), S. 83-92 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.65F ; 62.65C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Phase conjugation via stimulated Brillouin scattering in CH4 gas has been used to correct amplifier aberrations in a Nd: YAG oscillator/amplifier system. The single amplifier stage has been used in two-pass and four-pass arrangements. Using the four-pass arrangement incorporating compensation for thermal birefringence, a single-frequency diffraction-limited output of 350 mJ, in a compressed 6 ns pulse is achieved at 15 Hz repetition rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694694
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  • 4
    Electronic Resource
    Electronic Resource
    Rydberg and autoionization tm states investigation by the three-step laser excitation and electric field ionization method (1987)
    Springer
    The European physical journal 5 (1987), S. 287-292 
    Details
    ISSN: 1434-6079
    Keywords: 32.80 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energies of 190 Rydberg and autoionization 4f 13 6snp-states of the Tm atom (ground electron configuration 4f 13 6s 2, nuclear chargeZ=69) have been measured by the laser multistep excitation with subsequent electric field ionization method. The investigation range of these states has been extended towards states with higher and lower values of the principal quantum number. As a result the energies of 160 states have been obtained for the first time. The experiment has been carried out on an automated laser photoionization spectrometer. The measurement accuracy has been ±0.5 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01385458
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  • 5
    Electronic Resource
    Electronic Resource
    Tm autoionization rydberg states in the vicinity of the third and fourth atomic ionization limit (1989)
    Springer
    The European physical journal 13 (1989), S. 115-121 
    Details
    ISSN: 1434-6079
    Keywords: 32.80 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energies of about 200 autoionization Rydberg states of the thulium atom have been measured in the 57380–58960 cm−1 energy region by laser multistep excitation and subsequent autoionization with an accuracy of ±0.4 cm−1. More than a half of the states have been grouped in series. New spectroscopic information has been derived. Three-step two-colour effective excitation schemes have been proposed for thulium atom detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398580
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  • 6
    Electronic Resource
    Electronic Resource
    Laser-induced chemical etching of silicon in chlorine atmosphere (1987)
    Springer
    Applied physics 43 (1987), S. 227-232 
    Details
    ISSN: 1432-0630
    Keywords: 81.60 ; 82.65 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Chemical etching of single-crystalline (100)Si induced by pulsed laser irradiation at 308, 423, and 583 nm has been investigated as a function of the laser fluence and C12 pressure. Without laser-induced surface melting, etching requires Cl radicals which are produced only at laser wavelengths below 500 nm. With low laser fluences (Φ(308 nm)〈100 mJ/cm2) etching is non-thermal and based on direct interactions between photocarriers and Cl radicals. For fluences which induce surface melting (Φ(308 nm)〉440 mJ/cm2) etching is thermally activated. In the intermediate region both thermal and non-thermal mechanisms contribute to the etch rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615982
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  • 7
    Electronic Resource
    Electronic Resource
    Growth rates and electrical conductivity of microscopic ohmic contacts fabricated by laser chemical vapor deposition of platinum (1987)
    Springer
    Applied physics 44 (1987), S. 353-359 
    Details
    ISSN: 1432-0630
    Keywords: 81.10 ; 85.40 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The laser chemical vapor deposition of platinum from its bishexafluoroacetylacetonate derivative is studied with a cw argon ion laser at 458 and 514 nm. The height, the width, as well as the electrical conductivity of the deposited stripes are reported as a function of the vapor pressure of the metalorganic precurser, the laser intensity, and the writing speed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624603
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  • 8
    Electronic Resource
    Electronic Resource
    Gas phase versus surface contributions to photolytic laser chemical vapor deposition rates (1988)
    Springer
    Applied physics 45 (1988), S. 337-343 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 81.10 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The rate of cwphotolytic laser chemical vapor deposition (LCVD) of platinum is measured for λ≈350 nm as a function of the light intensity and the metalorganic vapor pressure. The growth of the metal films is studied in situ and in real time by monitoring their optical transmission. At low intensities the transmitted light decreases monotonically with time, and the LCVD process is photolytic with its rate limiting step in the surface adlayer. At higher intensities we observe two distinct time domains: Relatively slow initial photolytic deposition with its rate limiting step in the gas phase, which is followed by much faster pyrolytic LCVD. An improved method for distinguishing between adlayer and gas-phase limiting processes is demonstrated. These observations are confirmed by studying the photolytic deposition rates while varying the thickness of the adlayer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617940
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  • 9
    Electronic Resource
    Electronic Resource
    In situ preparation of Bi-Sr-Ca-Cu-O superconducting films by laser sputtering (1989)
    Springer
    Applied physics 49 (1989), S. 221-223 
    Details
    ISSN: 1432-0630
    Keywords: 74.70 ; 42.60 ; 81.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Superconducting films of Bi-Sr-Ca-Cu-O on (100) MgO substrates have been fabricated by XeCl-excimer-laser sputtering from ceramic targets of Bi2.5Sr2Ca2Cu3Oy in O2 atmosphere. The films were polycrystalline with the c-axis (30.80±0.02Å) preferably oriented normal to the substrate surface. Without post-annealing the films showed metallic resistance behavior with zero resistance temperatures of up to Tc(0) }- 79 K. The critical current density of the films had values of up to jc(50K)}- 104 A/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616303
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature effects in the photolytic LCVD of platinum (1989)
    Springer
    Applied physics 49 (1989), S. 189-197 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 81.10 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The photolytic laser chemical vapor deposition (LCVD) rate of platinum from its bishexafluoroacetylacetonate precurser has been measured in situ and in real time. Optical transmission of the 350 nm photolysis light through the deposited platinum film and a transparent glass substrate is monitored and analysed in detail. From these measurements, as well as measurements of the reflected light, the fraction of the laser beam power absorbed in the metal film is found. The latter allows a simple estimate of the laser-induced temperature rise at the metal surface. It is shown that even rather small temperature increases of the order of several tens of degrees centigrade can completely change the photolysis mechanism and hence drastically influence the photolytic LCVD rate. A simple modification of Lax's model, in which a temperature dependent thermal conductivity of the substrate is introduced, is used to describe the laser-induced heating of a strongly absorbing thin metal film on a glass substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616298
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