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  • 1990-1994  (3)
  • 1985-1989  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    High-temperature pulsed slit nozzle for supersonic jet spectrometry (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3026-3027 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An interface converting a cone flow into a rectangular flow is attached to a conventional nozzle with a circular orifice. This assembly can be heated to 300 °C, due to a metal-to-metal contact between an orifice and a plunger and to a Teflon-insulated copper wire of an electromagnet. At the top of the interface, two razor blades are attached to convert the rectangular flow into a slit flow. The enhancement factor (long axis/short axis) is 6 in fluorescence measurements. The signal intensity obtained by the slit nozzle is four times larger than the best value obtained by the conventional circular nozzle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144354
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Efficiently generated rotational and vibrational stimulated raman emission by means of a two-color laser beam (1991)
    Springer
    Applied physics 52 (1991), S. 211-216 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 51.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract When a two-color laser beam is introduced into pressurized hydrogen, about 40 laser emission lines are generated from the ultraviolet to the visible regions. This phenomenon is ascribed to the stimulated Raman effect due to a combination ofJ=1 →J=3 rotational andv=0 →v=1 vibrational transitions. By introducing the two-color laser beam, the threshold for generation of the rotational line is substantially reduced. The present phenomenon is attributed to four-wave mixing, which allows efficient generation of higher-order rotational and vibrational Raman lines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00750953
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Generation of multi-color stimulated raman emission from two-color linearly or circularly polarized pump beams (1993)
    Springer
    Applied physics 56 (1993), S. 259-262 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 51.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A laser beam at two different frequencies separated by 587 cm−1 is focused into pressurized hydrogen (rotational transition energy, 587 cm−1) to generate multi-color stimulated Raman emission. The polarization state and the pulse energy are measured for each generated emission line using linearly and circularly polarized pump beams. The effect of the polarization is discussed by using a parameter characterizing the polarizability of hydrogen and a conservation rule for the angular momentum in four-wave mixing. Many rotational lines are generated with linearly polarized pump beams through a four-wave mixing process. This is in striking contrast to the results obtained by using a single-color circularly polarized pump beam which generates only one rotational line through a conventional stimulated Raman process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325213
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Generation of more than 40 laser emission lines from the ultraviolet to the visible regions by two-color stimulated raman effect (1989)
    Springer
    Applied physics 49 (1989), S. 389-392 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 51.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An intense and monochromatic laser beam consisting of more than 40 vibrational and rotational lines is generated by the stimulated Raman effect, when two-color laser beams separated by ∼590 cm−1 are tightly focused into pressurized hydrogen. This phenomenon is reasonably explained by four-wave mixing; one beam is used for two-step excitation (ω1+ω1) to an imaginary level and another beam (ω2) acts as a seed beam, generating a fourth beam (2ω1−ω2). Through cascade processes, so many laser emissions appear with a frequency difference of (ω1−ω2) in entire ultraviolet and visible regions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324191
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