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  • 1
    Electronic Resource
    Electronic Resource
    Fourier-transform-limited, high-power picosecond optical parametric oscillator based on periodically poled lithium niobate (2000)
    Springer
    Applied physics 70 (2000), S. 741-746 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Re; 42.65.Yj; 42.72.Ai
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We report on an optical parametric oscillator (OPO) based on periodically poled lithium niobate (PPLN) synchronously pumped by a cw mode-locked picosecond Nd:YLF laser. High average output powers for the signal and idler radiation of 2.55 W and 2.4 W, respectively, have been achieved. The tuning range of the PPLN OPO is 1765–2060 nm for the signal radiation and 2155–2610 nm for the idler radiation, limited by the chosen set of mirrors. The OPO signal pulses are approximately bandwidth limited with a pulse duration of 45 ps and a spectral width of 0.35 cm-1. As an application of this OPO we generate tunable mid-infrared radiation in the wavelength range of 9.8–19.4 μm by difference-frequency mixing (DFM) of the OPO signal and idler radiation in a CdSe crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050001
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  • 2
    Electronic Resource
    Electronic Resource
    The internal energy of small ammonia clusters in a supersonic beam and after scattering off LiF(100) (2000)
    Springer
    The European physical journal 11 (2000), S. 109-114 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Sx Diffusion and dynamics of clusters - 68.45.Da Adsorption and desorption kinetics; evaporation and condensation - 82.65.Pa Surface-enhanced molecular states and other gas-surface interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The photoionization efficiency (PIE) of neutral ammonia clusters is studied as a function of photon energy. From these curves the internal energies of clusters in the incident supersonic beam and of clusters surviving after scattering off a LiF(100) surface are derived. A supersonic expansion of ammonia seeded in He produces small clusters of various size but with uniform kinetic energy of about 285 meV per monomer molecule. The mass distribution of clusters in the jet and of the scattered particles is measured in a reflecting time-of-flight mass spectrometer by single photon photoionization using vacuum ultraviolet (VUV) laser radiation tunable between and . In the incident beam the internal energies of clusters up to n = 15 do not vary significantly and amount to an average of about . After scattering off LiF(100) the internal energy of clusters up to n = 4 increases with fragment size and amounts to about half a monomer binding energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530070110
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the rotational alignment in the presence of the second order AC Stark effect (2001)
    Springer
    The European physical journal 17 (2001), S. 181-188 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 42.62.Fi Laser spectroscopy – 33.55.Be Zeeman and Stark effects – 33.15.-e Properties of molecules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The determination of the rotational quadrupole alignment of diatomic molecules via REMPI detection is investigated. In this process a high focal intensity usually increases the detection probability. At high intensities the AC Stark effect may cause a splitting of the normally degenerate mJ sublevels of a rotational state J beyond the spectral width of the exciting radiation. This leads to a selective detection of only certain mJ states with the consequence that deduced alignment factors can be misleading. From the theoretical considerations line profiles are explicitly calculated for dynamic polarizabilities which represent the B 1Σ+ u←X 1Σ+ g transition of H2, in order to fit an experimental (3+1) REMPI spectrum and to predict (1+1') line shapes as a function of laser intensity. It is further shown that the deduced quadrupole alignment factor A 0 (2) is significantly changed by the second order AC Stark effect when the intensities are chosen high enough to observe asymmetric broadened line profiles. Different combinations of relative linear polarizations of the exciting and ionizing laser beams are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170021
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    Paper (German National Licenses)
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