Library

X
Clear history
  • 1: advanced search Author, Corporation: Gal, H   :    :   —  14 hits    Redo Search Permalink feed icon
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles: DFG German National Licenses  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Acoustic focusing associated with excimer laser ablation of the cornea (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 647-649 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Focusing, as well as diffraction effects experienced by the stress wave produced by the argon–fluoride excimer laser ablation of corneal tissue have been studied in artificial and real eye samples. The evolution of the laser-induced acoustic front was imaged by means of fast shadowgraphy in an artificial eye model, while the absolute temporal profile of the pressure transient along the optical axis was directly measured in enucleated porcine eyes by a needle hydrophone inserted into the eyeball. Observations pointed out that the finite size of the acoustic source gave rise to diffraction effects during propagation, as the development of a negative tensile phase in the pulse shape, while the spherical shape of the acoustic source produced focusing of the wave front, causing pressure enhancements up to a factor of 3 in real eyes. The implications to surgical laser procedures as photorefractive keratectomy are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120834
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Variable energy blast modeling of the stress generation associated with laser ablation (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1233-1235 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stress generation induced by laser ablation was modeled by adapting the variable energy blast theory in the condition of laser–target interaction in air that allowed us to obtain the scaling law of the peak and the temporal profile of the pressure pulse. Measurements of the acoustic transient propagating inside the bulk during excimer laser ablation of polyimide, performed by means of polyvinyldenefloride piezoelectric sensors, were successfully compared with the behaviors provided by the theoretical model. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123509
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ultraviolet four-photon mixing in a multimode silica fiber Raman amplifier
    Amsterdam : Elsevier
    Optics Communications 47 (1983), S. 226-229 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(83)90123-2
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A heat semigroup version of Bernstein's theorem on Lie groups (1990)
    Springer
    Monatshefte für Mathematik 110 (1990), S. 101-114 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper establishes a heat semigroup version of Bernstein's theorem, applicable to any unimodular Lie group. The result has an intrinsic geometric content, involving estimates for the norms of the heat kernels for small time and large time. The theorem is stated in terms of certain Lipschitz spaces whose definition incorporates these two geometric features of the group in question. The geometric content is further underlined by showing that, in a certain sence, the theorem is best-possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01302779
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Stimulated Raman scattering of copper vapour laser radiation in optical fibres (1991)
    Springer
    Optical and quantum electronics 23 (1991), S. S555 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Wideband frequency conversion of copper vapour laser radiation has been achieved by stimulated Raman scattering in multimode silica fibres. Up to nine Stokes' orders have been generated in the 511 to 649 nm spectral region with a conversion efficiency greater than 90% of the fibre output. Four-wave mixing processes involving laser and Stokes' lines have also been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619650
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    High-quality drilling with copper vapour lasers (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 1243-1256 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-quality materials processing on transparent substrates of BK7 glass, fused silica, corundum and ruby using a copper vapour laser (CVL) is described and discussed. The driling process using the radiation emitted by a small diffraction-limited CVL is described and investigated by optical diagnostic methods allowed by the transparency of the materials. In particular the hole making was entirely monitored in real time through a video camera. Images achieved in this way are reported to illustrate the morphology of the hole and of the ejected materials via the time-resolved fluorescence. This investigation provides the evaluation of the plume expansion speed, while the imaging supplies the quantitative evaluations of the drilling speed and threshold. The high quality of the hole in terms of wall smoothness and elevated aspect ratio is described in detail. We report according to our findings an interpretation of the peculiar combination of physical processes involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326479
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Imaging and analysis of photomechanical effects induced in water by high-power laser-target interaction (1996)
    Springer
    Applied physics 62 (1996), S. 503-510 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 81.60 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The kinetics of cavitation and associated photo-mechanical effects induced by underwater pulsed-laser irradiation of solid targets has been studied experimentally and analyzed with theoretical methods. A xenon-chloride excimer laser of 150 ns pulse duration has been utilized to produce ablation and local photofragmentation of artificial samples of hard tissues at fluences of 12–24 J/cm2. The evolution of pressure wave and cavitation formations developing in the liquid from the target surface after laser irradiation has been observed with a time-resolved imaging technique employing a pump-probe laser arrangement. The analysis of experimental results has been performed by using the theoretical model of “point explosion” that has been successfully applied to fit the cavitation kinetics, providing also quantitative information on the energy transfer during photo-acoustic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081051
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    N2 laser frequency conversion by stimulated Raman scattering in H2 (1987)
    Springer
    Applied physics 42 (1987), S. 111-113 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 Cq ; 42.55 Fn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-efficiency frequency conversion in H2 of a nitrogen laser oscillator-amplifier system is described. The laser system provides about 1 MW output power with a very low intrinsic divergence. Up to 3 Stokes lines at 392, 468, and 581 nm and 3 Anti-Stokes at 296, 263, and 237 nm, respectively, have been observed at the output of the 60 cm long H2 Raman cell. Peak power values of 500, 300, and 70 kW have been measured for the first 3 Stokes, respectively, corresponding to a 56% pump energy conversion efficiency. A comparison between free and guided propagation (in a hollow dielectric waveguide) is also reported, for various values of the pump intrinsic divergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694819
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Probe-beam deflection diagnostics of shock waves generated during laser drilling (1995)
    Springer
    Applied physics 61 (1995), S. 505-510 
    Details
    ISSN: 1432-0649
    Keywords: 81.40.-z ; 42.55.Rz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A probe-beam deflection technique was employed to investigate the evolution of shock waves generated during drilling processes of optical materials by a high repetition rate copper vapor laser. Experimental observations were analyzed by using a theoretical model of shock wave expansion which also furnished quantitative information on the main physical functions associated to laser-induced acoustic phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081281
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Auto-prepulse operation of a long-pulse XeCl laser (1992)
    Springer
    Applied physics 54 (1992), S. 259-264 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 42.60.By
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A standard corona preionized XeCl laser prototype has been excited by a very simple L-C circuit consisting of a large storage capacitance charged at relatively low voltage (12 kV) and discharged via a switch on the electrodes, tightly coupled with the peaking capacitors. The resulting overvoltage following the switch closure behaves as an effective and automatic prepulse, providing a homogeneous discharge lasting up to 400 ns. Energy output levels of the order of 150 mJ at 1.4% overall efficiency have been achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325190
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...