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  • Articles  (13)
  • 42.55
  • Springer  (13)
  • Annual Reviews
  • Nature Publishing Group
  • PANGAEA
  • 1980-1984  (13)
  • 1983  (13)
Collection
  • Articles  (13)
Source
Keywords
Publisher
  • Springer  (13)
  • Annual Reviews
  • Nature Publishing Group
  • PANGAEA
Years
  • 1980-1984  (13)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    New FIR laser lines from optically pumped DCOF (1983)
    Springer
    Applied physics 30 (1983), S. 1-4 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty FIR laser lines with wavelengths between 146 and 2000 μm have been observed from deuterated formyl fluoride (DCOF) optically pumped with isotopic CO2 lasers. Tunable diode laser measurements on thev 4 band of DCOF were combined with earlier high precision spectroscopic data on thev 3 andv 4 bands, and enabled identification of the transitions responsible for 9 of the new FIR lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692650
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  • 2
    Electronic Resource
    Electronic Resource
    Theory of synchronously pumped dye lasers (1983)
    Springer
    Applied physics 30 (1983), S. 135-142 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.60 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis of cw synchronously pumped dye lasers is presented. Under the assumption that the cavity (tuning element) bandwidth is much wider than the bandwidth of the transform limited pulses generated, the pulse forming dynamics is rigorously treated. It is shown that for a finite mismatch between the lengths of the dye and the pump lasers, a steady-state pulse develops in the dye laser cavity with a conserved pulseshape. The characteristics (energy, shape, peak power, duration) of these pulses of ultimate width are quantitatively determined as a function of cavity mismatch. An analytical solution for the pulse envelope is determined, which yieldsI(t)∝Sech2(t/t p ) to a good approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695468
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of added nitrogen on multiphoton absorption by ammonia (1983)
    Springer
    Applied physics 32 (1983), S. 75-78 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 34 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Multiphoton absorption (MPA) of the CO2 laser 9 μmR(30) line (pulse width 60 ns, FWHM) by NH3 and NH3/N2 mixtures was studied as a function of gas composition, pressure and laser fluence (Φ). MPA occurs for Φ smaller than those that have been used for optically pumped NH3/N2 lasers; consequently a simple two-level absorption model will not adequately describe laser action in these systems. The photon energy deposited in NH3/N2 mixtures can be calculated from the MPA cross-section and the fluence dependence of the illumination geometry. An examination of the efficiency of conversion of this absorbed energy to the reported radiant energy of optically pumped NH3/N2 lasers shows an optimum value which depends on pressure, and gas composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688546
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  • 4
    Electronic Resource
    Electronic Resource
    Power enhancement of the cw 12.08 μm NH3 Raman laser with the addition of H2/He buffer gases (1983)
    Springer
    Applied physics 32 (1983), S. 105-111 
    Details
    ISSN: 1432-0649
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effects of H2, He, and N2 buffer gases on the efficiency of the cw 12.08 μm NH3 Raman laser are studied experimentally. The laser output power is increased by nearly 60% with the addition of H2 or He, which we essentially attribute to the high thermal conductivity of these buffer gases. In the optimum conditions (NH3/H2:1/1 mixture with 0.35 Torr partial pressure of NH3) 3.3 W output power at 12.08 μm is obtained which corresponds to 11% power conversion efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688814
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  • 5
    Electronic Resource
    Electronic Resource
    A cw uv copper hollow cathode laser in the 260 nm region (1983)
    Springer
    Applied physics 32 (1983), S. 127-135 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A cw uv copper hollow cathode laser is described, which could be operated for a longer time duration with an output power of 7 mW in the 260 nm region. A double-cathode configuration with a protection for the mirrors from metal-vapour deposition is presented. Characteristics of the laser output power, the spontaneous emission, and the ion densities in the negative glow were measured as depending on the discharge current, the neon gas pressure, and the size of the cathode slit. The observed saturation of the laser output power at high discharge current (1 A/cm2) and the optimum slot size are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688818
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  • 6
    Electronic Resource
    Electronic Resource
    Population inversion in thallium by flashlamp-photodissociation of TII (1983)
    Springer
    Applied physics 32 (1983), S. 83-84 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 33.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A population inversion between the 62 P 3/2 and 62 P 1/2 state of thallium has been achieved for the first time by incoherent photodissociation of TII. This is accomplished by using wall-ablating flashlamps of short risetime and appropriate light filtering. The inversion lasts about 4 μs and is terminated by quenching collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688548
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  • 7
    Electronic Resource
    Electronic Resource
    The vibrational relaxation time constant for theB v=0 level of XeCl (1983)
    Springer
    Applied physics 32 (1983), S. 193-198 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 33 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The vibrational relaxation time constant for theB v=0 vibrational level of XeCl* has been investigated by observing the coupling between theB v=1 andB v=0 vibrational levels under saturated lasing conditions. Based on this observation, estimates of the expected extraction efficiency from theB-state have been made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688287
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  • 8
    Electronic Resource
    Electronic Resource
    Further study of continuous-wave CO flame chemical laser of the CS2/O2/N2O type (1983)
    Springer
    Applied physics 30 (1983), S. 29-33 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This report describes an experimental examination of the output characteristics of the continuous-wave (cw) carbon monoxide flame chemical laser (FCL) of the CS2/O2/N2O type in case of small CS2/O2 reactants ratios (tipically CS2/O2≦1/10). A linear burner which gives a homogeneous and stable flame was used during the experimental study. The measurements of temperature distribution in CS2/O2 as well as CS2/O2/N2O flames show maximum temperatures of 1040 and 890 K, respectively. The addition of nitrous oxide (N2O) leads to dramatically enhanced output laser power caused primarily by V−V transfer processes. A chemical efficiency, based on the reaction O+CS→CO*+S, of 3% was achieved. The spectral composition of the CO FCL of the CS2/O2/N2O type shows lasing in the region from 5.130 to 5.586 μm. Experimental results were obtained with a nondispersive optical cavity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692655
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  • 9
    Electronic Resource
    Electronic Resource
    FIR NH3 cascade laser excited by a Q-switch laser (1983)
    Springer
    Applied physics 31 (1983), S. 5-8 
    Details
    ISSN: 1432-0649
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Short FIR laser pulses of high repetition rate are obtained by pumping NH3 with the pulses of a passively Q-switched IR laser. The two cascade laser transitions observed show coupled relaxation oscillations. The pulse shapes and delay times are qualitatively in agreement with a four-level rate-equation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693899
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  • 10
    Electronic Resource
    Electronic Resource
    Repetitive passive Q-switching and bistability in lasers with saturable absorbers (1983)
    Springer
    Applied physics 30 (1983), S. 57-77 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report detailed experimental data on the passive Q-switching operation in a CO2 laser with CH3I saturable absorber, and on the transient behaviour in the near-Q-switching situation. Under suitable operating conditions, we found bistability in the output power. In some cases, we observed the simultaneous presence of bistability and passive Q-switching. The theoretical part of the paper starts from the four-level model of laser with saturable absorber, as formulated by other authors. By adiabatically eliminating the variables of the resonant levels, we reduce the problem to a set of three differential equations, from which we derive explicit analytical conditions for the rise of passive Q-switching. These conditions turn out to be in good qualitative and partially quantitative agreement with our experimental findings as well as with other experimental data previously obtained by other authors. Finally we classify the possible combinations of passive Q-switching and bistability that one can find in this type of experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688479
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  • 11
    Electronic Resource
    Electronic Resource
    Dye stability under excimer-laser pumping (1983)
    Springer
    Applied physics 30 (1983), S. 109-116 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of polymethine dyes under XeCl laser excitation has been investigated. (For these dyes emitting in the ir the difference between absorbed and emitted photoenergy is 2 eV.) The stability was measured in an amplifier device operating in the saturated regime. While the influence on dye concentration is negligible, the fluence dependence shows the importance of two photon absorptions. A meausure for the stability is the number of photons which can be emitted per dye molecule before the dye solution has degraded to 50% of the initial value. This value is in the range of 150–280. The stability is clearly related to the formation of photoproducts absorbing at the pump and the laser wavelength. A model starting from the change in the dye solution absorption spectra is in very good agreement with the observed energy decays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695464
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  • 12
    Electronic Resource
    Electronic Resource
    Modulation of radiation in nonstationary resonant media (1983)
    Springer
    Applied physics 30 (1983), S. 41-45 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 42.10 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the propagation of radiation in a gas, the resonant frequency of which changes with time when affected by external electric and magnetic fields. It is shown that for an harmonic change of the resonant frequency under appreciable energy exchange between electromagnetic field and medium, deep amplitude modulation of radiation may be achieved. The analytical expressions obtained for a field in a gas allow rather accurate calculation of the space-time structure of the radiation penetrated through the medium layer. The numerical calculations are compared with the known experiment [4], good agreement is obtained. The transformation of radiation between dispersive branches with adiabatic stepwise variation of the resonant frequency has been also studied. Branch-tobranch transformation is investigated and the adiabatic invariant is found to be the total number of the high and low frequency radiation quanta corresponding to two dispersive branches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692657
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  • 13
    Electronic Resource
    Electronic Resource
    cw far-infrared lasing in15NH3, stark resonantly pumped by a CO2 or N2O laser (1983)
    Springer
    Applied physics 32 (1983), S. 79-81 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 48 new resonant pumping schemes, by ir Stark tuning, have been performed on15NH3, with cw CO2 and N2O lasers. Among the 25 different fir wavelengths obtained, 15 correspond to new emissions, raising thus to 45 the total number of cw fir emissions from this gas, in the presence of electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688547
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