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  • 1
    Digitale Medien
    Digitale Medien
    New FIR laser lines from optically pumped DCOF (1983)
    Springer
    Applied physics 30 (1983), S. 1-4 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692650
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  • 2
    Digitale Medien
    Digitale Medien
    Energy efficiency in the multi-stage laser separation of13C by an elimination method (1983)
    Springer
    Applied physics 30 (1983), S. 143-148 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Energy efficiency has been discussed in the multi-stage laser separation of13C in the ir laser photolysis of CF3I. The comparison has been made between the two methods, i.e., the photolysis of13C molecules (ordinary method) and the photolysis of12C molecules (elimination method). The former recycles the photolyzed product after the regeneration of feed molecules, while the latter recycles the residue after the elimination of the photolyzed product. The analysis of the energy consumption using theoretical models has shown that the elimination method consumes more energy, but the difference is far less than expected; the overall energy consumption may reach the same level at a lower pressure according to our estimation which includes the factors of the quantum efficiency for the dissociation, the energy difference between the laser lines and the material loss for the regeneration. It may imply that the elimination method is more favored in a practical application because it is free from the regeneration procedure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695469
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  • 3
    Digitale Medien
    Digitale Medien
    The effect of added nitrogen on multiphoton absorption by ammonia (1983)
    Springer
    Applied physics 32 (1983), S. 75-78 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 34 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688546
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  • 4
    Digitale Medien
    Digitale Medien
    Laser photoion projector (1984)
    Springer
    Applied physics 33 (1984), S. 57-61 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.60 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A laser photodesorption microscope has been applied to obtain 4×103-fold images of rhodamine crystals on a tip with a diameter of 66μm. Peculiarities of the formation of these images have been studied with different values of electric field strength on the tip and laser pulse intensities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00690026
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  • 5
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 42.55 ; 33 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688287
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  • 6
    Digitale Medien
    Digitale Medien
    Dressed-atom approach for probe spectroscopy in Doppler-broadened three-level systems with standing-wave saturator (1983)
    Springer
    Applied physics 31 (1983), S. 115-129 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.50 ; 42.65 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The three-level probe spectroscopy of Doppler-broadened transitions in the presence of a standing wave pump laser is investigated through a diagrammatic method. A probe-response diagram is defined where the resonance positions versus the probe laser frequency and absorber velocity are plotted. The dressed atom description provides a convenient method for deriving the probe response diagram and calculating the position of the Doppler-free structures on the absorption spectrum, including the ac Stark shifts. We have interpreted probe spectra on the basis of the probe response diagram, presenting new features and giving a detailed physical interpretation of all the coherent effects appearing in the spectra. Population effects are not included in the dressed system analysis and are calculated on the basis of a semiclassical treatment, but the probe response diagram provides a complete interpretation of the involved phenomena.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00702607
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  • 7
    Digitale Medien
    Digitale Medien
    Multistep ionization of CS2 vapour (1983)
    Springer
    Applied physics 31 (1983), S. 153-155 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report on the multistep ionization process observed in CS2 vapour irradiated by 337 nm nitrogen laser light. We propose and discuss a model in which optical as well as collisional excitation are involved in the ionization process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688836
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  • 8
    Digitale Medien
    Digitale Medien
    Chemical reactions following the IRMPD of C2F3Cl (1984)
    Springer
    Applied physics 34 (1984), S. 97-106 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract C2F3Cl is photolyzed with a TEA-CO2 laser at 1050.44 cm−1 with focussed fluences up to 280 J/cm2. The stable products in the IRMPD of C2F3Cl are determined for up to 10 Torr of C2F3Cl being photolyzed both neat and with added O2. C2F4 and trans-C2F2Cl2 are found to occur in the greatest yield though C3F5Cl, C3F4Cl2, C4F7Cl, and C2F3Cl3 also appear to be primary products. When O2 is present F2CO, FClCO, and CF2ClCOF are the exclusive products. The formation of these products are for the most part consistent with a carbene formation dissociation mechanism for C2F3Cl IRMPD. C2F3Cl3 may best be explained by another mechanism competitive with carbene formation. Many products attributed to secondary photolysis mechanisms are observed for long photolysis times.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697955
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  • 9
    Digitale Medien
    Digitale Medien
    A differential detection scheme for Faraday rotation spectroscopy with a color center laser (1984)
    Springer
    Applied physics 34 (1984), S. 179-185 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 07 ; 33 ; 35
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A differential detection scheme to reduce source noise and to improve sensitivity based upon the Faraday effect has been developed. This method is particularly useful in connection with low-power, high-noise laser sources and multipass arrangements where a degradation of polarization quality is substantial. The theoretical background of the differential method is developed. It is tested with magnetic rotation signals from transitions of stable species with low modulation sensitivity and signals from free radicals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697632
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  • 10
    Digitale Medien
    Digitale Medien
    Second-stage enrichment in the laser separation of carbon isotopes (1984)
    Springer
    Applied physics 35 (1984), S. 173-177 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract There is a general agreement that efficient infrafed laser induced separation of carbon isotopes requires a two-stage process. An efficient first stage 1%→50%13C enrichment was shown by Gauthier et al. [1] to be feasible and competitive with conventional technology. In this work, second-stage CO2 laser enrichment of equimolar mixtures of12CHClF2 and13CHClF2 has been demonstrated yielding tetrafluoroethylene containing 95% or 99%13C. Forward enrichment by selective decomposition of the13CHClF2 fraction was very efficient, absorbing only 6 and 16 eV, respectively, per carbon atom produced at 95% and 99%13C content.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697709
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  • 11
    Digitale Medien
    Digitale Medien
    A broadband mid-infrared laser magnetic resonance spectrometer for the spectral range of 1200–2000 wavenumbers (1983)
    Springer
    Applied physics 31 (1983), S. 139-144 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A broadband mid-infrared laser magnetic resonance spectrometer is described, which can be operated in intracavity or extracavity configuration. The specially designed CO-laser gain tube allows operation from 1220–2000 cm−1. Experimental details and examples of spectroscopic applications are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688834
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  • 12
    Digitale Medien
    Digitale Medien
    Strong dependence of ir multiphoton absorption and dissociation yield of SF6 molecule on intensity (duration) of exciting laser pulse (1983)
    Springer
    Applied physics 30 (1983), S. 207-210 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The role of played by the intensity of the exciting TEA CO2 laser pulses in the processes of ir multiphoton absorption (MPA) of SF6 molecules cooled toT R≃40 K andT v≃160 K in a pulsed supersonic jet and the dissociation of SF6 in a bulk atT≃300 K under essentially collisionless conditions have been investigated. A strong dependence of MPA and the dissociation yield on pulse intensity were observed. The frequency dependences of the intensity effects were studied.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688408
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  • 13
    Digitale Medien
    Digitale Medien
    Multiphoton absorption of broad-band CO2 laser radiation by SF6 (1984)
    Springer
    Applied physics 35 (1984), S. 1-5 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33 ; 35
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Increase of the emission bandwidth of a high-pressure CO2 laser up to 1.5 cm−1 increases the multiphoton absorption cross-section of SF6. Comparison with the previously found [9] increased absorption for shorter pulses suggests that this is also a bandwidth effect. Spectral structures as narrow as 1 cm−1 above the 10th absorption step are invoked to explain the observations. The temperature effect, which disappears in the broad-band case, confirms this view.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697513
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  • 14
    Digitale Medien
    Digitale Medien
    Dye stability under excimer-laser pumping (1983)
    Springer
    Applied physics 30 (1983), S. 109-116 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695464
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  • 15
    Digitale Medien
    Digitale Medien
    Applications of two-photon absorption for detection of CO in combustion gases (1984)
    Springer
    Applied physics 33 (1984), S. 205-208 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 82,40
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser-induced fluorescence has been used for detection of CO in different environments. The fluorescence light was obtained by using a two-photon transition between theX 1∑− and theB 1∑− electronical states around 230 nm. Cell measurements indicate a detection limit lower than 0.1 ppm. Measurements in a CH4/air flame and in a low pressure dc discharge were realized with a diode-array detector, which was used in an imaging mode, permitting single-shot CO distributions to be captured.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697329
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  • 16
    Digitale Medien
    Digitale Medien
    CARS spectra of thermally excited SF6 molecules (1983)
    Springer
    Applied physics 31 (1983), S. 89-96 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract CARS spectra of thev 1 mode of thermally excited SF6 were calculated numerically. The influence of the vibrational quasicontinuum on the CARS spectra has been considered by introducing different types of the homogeneous broadening at different vibrational levels. The appearance of additional lines in the CARS spectrum due to mixing of high-lying vibrational levels by Fermi coupling was considered numerically in the frame of a simple model. A comparison of calculated and experimental spectra has been made.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00702604
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  • 17
    Digitale Medien
    Digitale Medien
    CVL-pumped dye laser for spectroscopic application (1984)
    Springer
    Applied physics 35 (1984), S. 31-36 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 33 ; 36
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A spectroscopic dye laser system-pumped by a Copper Vapor Laser (CVL)-has been built and optimized for different dye solutions operating in the spectral range from 530 to 890 nm. Conversion efficiencies up to 40% were reached in broad band operation, 24% with a prism expander grating cavity, and 20% in grazing incidence configuration, which operated at typical band widths of 3 GHz. Second harmonic generation (SHG) of the dye laser output produced tunable uv-radiation between 260 and 408 nm at conversion efficiencies ≦5%. Fundamental and SHG output were used for resonant ionization experiments in molecular beams.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697518
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  • 18
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 33 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688547
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  • 19
    Digitale Medien
    Digitale Medien
    Laser irradiation of a three-level gas system: Continued-fraction theory and applications (1984)
    Springer
    Applied physics 34 (1984), S. 73-82 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 32 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The general steady-state solution of the density matrix equations for a Doppler broadened three-level system irradiated by two resonant standing-wave laser beams of arbritrary intensity is analyzed. The solution is expressed in a matrix continued fraction form, that involves 4×4 matrices in important configurations and is convenient for numerical computations. Some representative cases including the absorption spectra for a probe laser of arbitrary intensity, the Doppler-free multiphoton resonances and the optically pumped lasers are analyzed numerically in connection with previous experimental investigations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697951
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