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  • LASERS AND MASERS  (2)
  • 1990-1994  (2)
  • 1950-1954
  • 1935-1939
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  • 1990-1994  (2)
  • 1950-1954
  • 1935-1939
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  • 1
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    Aerosol-induced laser breakdown thresholds - Effect of resonant particles (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Laser intensity thresholds for the onset of stimulated Raman scattering and the breakdown in resonant micron-sized droplets are reduced to below those for nonresonant droplets by a factor of about 3. This reduction is most likely caused by the enhancement of electromagnetic energy (photon) densities within the droplets over and above that in nonresonant droplets. The magnitude of the threshold reduction for breakdown is consistent with the assertion that: (1) input (pump) wavelength resonances that initiate plasma have cavity Qs of about 10 exp 4; and (2) finite regions of high-electromagnetic-energy density within the droplet, with dimensions of the order of the Debye length, are required to initiate plasma.
    Keywords: LASERS AND MASERS
    Type: Applied Optics (ISSN 0003-6935); 31; 311-318
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observations of stimulated Raman scattering and laser-induced breakdown in millimeter-sized droplets (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: We report the first observations, to our knowledge, of nonlinear optical effects in large (millimeter-sized) droplets. Stimulated Raman scattering (SRS) and laser-induced breakdown (LIB) are simultaneously observed in acoustically levitated millimeter-sized glycerol droplets irradiated by either a frequency-doubled (532-nm) or a frequency-tripled (355-nm) Nd:YAG laser. The two processes, which occur above a nearby coincident irradiation threshold, are conjectured to arise from a common initiation mechanism: self-focusing. LIB generates vapor bubbles within the droplet, resulting in the quenching of SRS emission.
    Keywords: LASERS AND MASERS
    Type: Optics Letters (ISSN 0146-9592); 17; 22; p. 1569-1571.
    Format: text
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    NASA TECHNICAL REPORTS
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