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  • Artikel  (31)
  • 32  (31)
  • Springer  (31)
  • 1980-1984  (31)
  • Physik  (31)
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  • 1
    Digitale Medien
    Digitale Medien
    On the possibility of highly selective detection of rare isotopic atoms by means of resonant laser light pressure (1984)
    Springer
    Applied physics 33 (1984), S. 247-251 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 07.65 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The application of laser deceleration and monochromatization of atoms in the schemes of single atom fluorescent detection is examined. The analysis performed shows that the use of resonant-light pressure in experiments with atomic beams enables one to obtain an ultimate value of detection selectivity that ranges from 1013 to 1016.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697336
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  • 2
    Digitale Medien
    Digitale Medien
    Novel spectroscopy (1982)
    Springer
    Applied physics 28 (1982), S. 297-305 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 42.80 ; 33 ; 82 ; 34
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697859
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  • 3
    Digitale Medien
    Digitale Medien
    Lifetime, photostability, and chemical structure of IR heptamethine cyanine dyes absorbing beyond 1 μm (1982)
    Springer
    Applied physics 29 (1982), S. 15-18 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Optical absorption,S 1 lifetime, and photostability are investigated for a series of heptamethine ir dyes and related to chemical structure. The high photostability of several dyes and the large range ofS 1 lifetimes make these dyes very interesting for ir dye lasers and for ir mode-locked laser systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694363
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  • 4
    Digitale Medien
    Digitale Medien
    Laser-selective enrichment of 3d-states of the Ca II ion for detecting rare radioactive isotope calcium-41 (1982)
    Springer
    Applied physics 29 (1982), S. 287-290 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract For the detection of the rare radioactive isotope41Ca, the possibilities of the earlier-proposed initial-state enrichment by continuous-wave laser radiation are examined. It is shown that the enrichment ∼1014 of 3d-states of the ion Ca II can be reached. As the method of enriched-state detection, the process of resonant charge exchange is analysed. For a further increase of the selectivity, the repetition of the cycle “initial state enrichment plus resonant charge exchange” is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00689189
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  • 5
    Digitale Medien
    Digitale Medien
    Sensitive laser spectroscopy on trapped barium ions by quenching with hydrogen (1983)
    Springer
    Applied physics 30 (1983), S. 83-86 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 07.65 ; 34 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The sensitivity of laser spectroscopy on barium ions stored in a radio frequency quadrupole trap was drastically increased by using hydrogen for quenching the optically pumped metastable states. The attained fluorescence intensity per ion permits the detection of single ions. The method will be applied to environmental studies on actinides.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688481
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  • 6
    Digitale Medien
    Digitale Medien
    Laser atomic photoionization spectral analysis of element traces (1983)
    Springer
    Applied physics 30 (1983), S. 161-176 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 42.50 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new method for determining trace amounts of elements in a substance has been developed. It is based on thermal evaporation and atomization of a substance in vacuum and detection of the released trace atoms by the laser stepwise photoionization technique. A rather effective way of detecting atoms is their multistep excitation to Rydberg states by the radiation of tunable dye lasers with their subsequent ionization by electric field pulses. The analytical laser spectrometer consisting of several tunable, pulsed dye lasers, a vacuum chamber with an atomizer and a recording system is described. The microimpurities of elements have been detected in pure materials: the contents of Na impurities in CdS crystals (2×10−6%) and Al impurities in germanium (2×10−7%). The detection limit of about 10−9% was determined. A technique for direct determination of the content of elements in natural water and human blood is described. A high sensitivity, universality and other merits of the method enable it to be used in determining traces of many important elements at a level of 10−8 to 10−11% almost in any matrix.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688402
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  • 7
    Digitale Medien
    Digitale Medien
    Photoionization detection of stimulated Raman scattering on electron transitions of Na in an atomic beam (1983)
    Springer
    Applied physics 31 (1983), S. 135-137 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Stimulated Raman scattering has been experimentally studied by using the process of two-step ionization of a Na atomic beam. A dip that is due to a resonance at a combination frequency corresponding to the forbidden 3S–4S transition of a Na atom was observed in the signal of nonresonant photoionization when two laser frequencies λ1=284.5 nm and λ2=1.06 μm were overlapped.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00702609
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  • 8
    Digitale Medien
    Digitale Medien
    Production of photoionic gallium beams through stepwise ionization of atoms by laser radiation (1983)
    Springer
    Applied physics 30 (1983), S. 47-52 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Production of intensive (up to 1 mA) ionic beams through stepwise photoionization of atoms induced by laser radiation is investigated. Optimum photoionization schemes are presented. A photoionic gallium beam is obtained with an average current value of 2.5 μA.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692658
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  • 9
    Digitale Medien
    Digitale Medien
    Light-polarization modifications in a multipass cavity (1982)
    Springer
    Applied physics 29 (1982), S. 43-54 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.80 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper analyses the slight change undergone by the polarization of a laser beam performing a multipass between two spherical mirrors facing each other. We replace the general 16-parameter Mueller formalism by an approximate 7-parameter one, and we give a quantitative experimental criterion for the validity of this approximation. Then we apply this formalism to the analysis of our experimental data. The results evidence:i) intrinsic birefringence in the mirror coatings (typical value per reflexion ∼2 to 4×10−4 rad);ii) birefringence due to off-normal incidence (typically 3.6×10−5 rad per reflexion for an incidence of 2×10−2 rad);iii) optical rotation, of purely geometrical origin (typically 14° for a multipass with revolution symmetry and 100 forward-backward passes under constant incidencei=2°);iv) no observable circular dichroism (≲10−6). Finally these results are discussed in connection with possible associated systematics in a parity violation experiment which motivated this work.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694368
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  • 10
    Digitale Medien
    Digitale Medien
    Nonlinear laser spectroscopy (1982)
    Springer
    Applied physics 29 (1982), S. 160-169 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 35 ; 42.65 ; 32 ; 33 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688659
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  • 11
    Digitale Medien
    Digitale Medien
    Sensitive magnetic rotation spectroscopy of the OH free radical fundamental band with a colour centre laser (1981)
    Springer
    Applied physics 26 (1981), S. 173-177 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 35
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The magnetic rotation technique has been optimized and applied for spectroscopy of the OH fundamental band at about 3670 cm−1 by use of a colour centre laser. The response of the molecules to the modulation field has been studied in detail, resulting in calculation of effectiveg-values, which describe the modulation sensitivity of the transitions and the phase of the signals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692443
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  • 12
    Digitale Medien
    Digitale Medien
    A classical model of the photon echo (1983)
    Springer
    Applied physics 31 (1983), S. 45-52 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An observation and the theory of a nonlinear response in the ensemble of nonlinear classical oscillators excited by two field pulses — similar to the phenomenon of a photon echo in optics — are reported. It has been shown that an echo arises in any ensemble with an inhomogeneously broadened line regardless of the type of interaction with a field (classical or quantum). New peculiarities appear during the determinate distribution of frequencies in the ensemble. On the one hand, an echo pulse is observed with a relatively small (about 100) number of oscillatorsN, on the other, new pulses spaced at a distance that is proportional toN arise in the nonlinear response.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693905
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  • 13
    Digitale Medien
    Digitale Medien
    Narrowing of a two-photon resonance due to elastic collisions (1983)
    Springer
    Applied physics 31 (1983), S. 249-252 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 34
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The lineshape of two-photon absorption in a standing-wave field during elastic collisions is studied. It has been found that the transit broadening of the two-photon resonance on vibrational-rotational molecular transitions is sharply decreased because of an increase in the time of interaction of particles with the electromagnetic field due to elastic collisions. The effect considered allows one to obtain supernarrow optical resonances of two-photon absorption in a low-pressure gas with high intensity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00690795
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  • 14
    Digitale Medien
    Digitale Medien
    Coherent transient phenomena (1982)
    Springer
    Applied physics 28 (1982), S. 274-282 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.80 ; 33 ; 36 ; 36.10 ; 14 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697856
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  • 15
    Digitale Medien
    Digitale Medien
    Observation of superfluorescence and stimulated emission in Bi I after nonresonant two-photon pumping (1984)
    Springer
    Applied physics 35 (1984), S. 7-10 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report the observation of superfluorescence and of stimulated emission in the near-infrared at 965.69 nm in atomic Bi. The atoms are prepared in the 6p 2(3 P 0)7p 3/2 upper state by nonresonant two-photon excitation. The cooperative character of the emission is demonstrated by the delay of the light pulses and their N2 dependence upon the atomic density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697514
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  • 16
    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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  • 17
    Digitale Medien
    Digitale Medien
    Laser cooling of trapped particles II (1981)
    Springer
    Applied physics 24 (1981), S. 71-84 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We consider cooling of a trapped particle in the limit when the position and velocity variables do not change adiabatically. The slowly varying quantity in a harmonic trap is then the energy, and a representation based on oscillator eigenstates is used. For large excitation, fast particles, a Fokker-Planck expansion is obtained which is valid when our adiabatic description breaks down. Estimates of the initial cooling rate are given and compared with earlier results. Our treatment requires a large number of oscillator states to be coupled by each one-photon process, and in this limit the diffusion will make the expansion invalid towards the end of the cooling; our physical interpretation is that particles leak out of the trap. The opposite case, the Lamb-Dicke regime, is advantageous for cooling experiments, and then a difference equation replaces the Fokker-Planck equation of the present paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00900402
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  • 18
    Digitale Medien
    Digitale Medien
    Frequency stability of a mercury ion frequency standard (1981)
    Springer
    Applied physics 24 (1981), S. 107-112 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 06.30 F ; 32 ; 35 ; 52-55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Observation with an improved signal-to-noise ratio of the hyperfine resonance pattern of199Hg+ stored in a radiofrequency trap is reported. A frequency control loop which locks the frequency of a 5MHz quartz crystal oscillator to the hyperfine transition of stored mercury ions, close to 40.5 GHz, is described. In this system, pulses delivered by the photomultiplier are processed digitally. Optimal conditions for the interrogation of the hyperfine transition are specified. A fractional frequency stability σy(τ)=3.6×10−11τ−1/2 for 10s〈τ〈3500s has been obtained. This frequency stability is comparble to that of commercially available cesium beam frequency standards. Prospect for improvement by a factor of at least 10 are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902264
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  • 19
    Digitale Medien
    Digitale Medien
    Laser cooling of trapped particles I: The heavy particle limit (1980)
    Springer
    Applied physics 21 (1980), S. 283-291 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We discuss laser cooling of a trapped ion. The problem is formulated for a harmonic trapping well and one-dimensional cooling. We carry out an adiabatic elimination and a Fokker-Planck expansion in the limit of a slowly oscillating particle. The ensuing Fokker-Planck equation is discussed and solved in certain limits. Especially the final cooling stages and ultimate width are of interest. The approach is related to earlier work and its validity is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886180
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  • 20
    Digitale Medien
    Digitale Medien
    Multi-photoelectron fluorescence selective detection of single atoms by laser radiation (1980)
    Springer
    Applied physics 22 (1980), S. 245-250 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 07.65 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The results of fluorescence detection of single Na atoms in atomic beams have been presented. It has been shown that, in recording single atoms via the fluorescence signal from the photoelectron of thek〉1 atom, it is possible to achieve extremely high selectivity (S≃1020) of detection of these atoms against a great number of other atoms. The probability of recording the atom is slightly decreased.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886015
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  • 21
    Digitale Medien
    Digitale Medien
    High-resolution optical spectra of laser cooled ions (1980)
    Springer
    Applied physics 22 (1980), S. 365-368 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We obtain essentially Doppler free spectra of the naturally occuring isotopes of Mg+, which are bound in a Penning trap, by using a frequency stabilized laser to continuously cool the ions, while the scatter rate from a second, frequency swept laser is, monitored. We show that the magnetron motion as well as the cyclotron and axial motion can be minimized. Line position measurements yielding resonance transition energy, isotope and hyperfine shifts are reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00901058
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  • 22
    Digitale Medien
    Digitale Medien
    Broad band resonant light pressure (1980)
    Springer
    Applied physics 21 (1980), S. 35-45 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract This paper treats the mechanical pressure of resonant light acting on a two-level system, where the degenerate magnetic sublevels are taken into account. The theory is developed with arbitrary relations between the quantization axis and the propagation and polarization of the light. Rate terms are obtained both for spontaneous and induced transitions; the requirements of incoherence put restrictions on the possible geometries of the experiment. The rate equations are restricted to motion along a light beam only; this one-dimensional case is simpler to handle. For small recoil velocities a Fokker-Planck equation is derived, and an adiabatic elimination procedure enables us to derive an equation for the velocity distribution of the total population. The assumptions and approximations are formulated and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886481
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  • 23
    Digitale Medien
    Digitale Medien
    Light-pressure cooling of trapped ions in three dimensions (1980)
    Springer
    Applied physics 23 (1980), S. 175-182 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We formulate a Fokker-Planck theory for the three-dimensional cooling of a trapped ion by means of a single laser beam. Both the steady state and the dynamics of the cooling are discussed, and the correlations between the vibrational modes due to the light pressure are elucidated. A few comments on the actual experiments are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00899714
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  • 24
    Digitale Medien
    Digitale Medien
    Optical absorption resonances of trapped particles (1981)
    Springer
    Applied physics 25 (1981), S. 81-86 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We have previously shown the possibility of the existence of a one-photon resonance with homogeneous width in the center of an absorption line of trapped particles. The results of a detailed investigation of this resonance are given in the first part of the present paper. The second part is devoted to a two-photon resonance in a standing-wave field: the time of coherent interaction with the field is increased for trapped particles, which permits the elimination of transit resonance broadening.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00935396
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  • 25
    Digitale Medien
    Digitale Medien
    The scattering of slow atoms by light (1981)
    Springer
    Applied physics 25 (1981), S. 165-167 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract A kinetic equation has been obtained describing the motion of atoms in a resonant field of standing light wave. This equation is used to describe the scattering of atoms for conditions close to experimental ones [1]. It is shown that the dependence of atomic scattering has a dip at the resonance frequency of the field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00901291
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  • 26
    Digitale Medien
    Digitale Medien
    Separation of atomic beams by light pressure (1980)
    Springer
    Applied physics 21 (1980), S. 263-269 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We calculate the separation efficiency for an isotope-separation setup utilizing atomic beam deflection by light. The theory is based on the notion of the light-pressure force with due inclusion of the metastable states. The theory and the existing experimental results are compared, and the approximations are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886177
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  • 27
    Digitale Medien
    Digitale Medien
    Infrared fluorescence and laser action of fast mode-locking dyes (1980)
    Springer
    Applied physics 22 (1980), S. 355-359 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Fluorescence spectra in the near infrared are observed of the dye Eastman 9860 and of new, faster mode-locking dyes. The quantum efficiencies are determined to be small with η≃10−3. The short fluorescence lifetimes are deduced from optical gain measurements. The fluorescence time-constants are found to have the same value as the corresponding absorption recovery times. Even laser action is observed in these fast saturable absorbers previously belieyed to be non-fluorescent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00901056
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  • 28
    Digitale Medien
    Digitale Medien
    Laser cooling of trapped particles III: The Lamb-Dicke limit (1981)
    Springer
    Applied physics 24 (1981), S. 151-162 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract In this paper we consider the laser cooling of a trapped particle when the discrete nature of the quantum levels must be taken into account. We particularize the equations to the Lamb-Dicke limit when the oscillational, amplitude is much less than the optical wavelength. Then the quantum levels are coupled only to the neighbouring ones, and we can also find a small parameter to use for adiabatic elimination of rapidly varying terms. There emerges one rate equation for the probability distribution over the quantum states. The ultimate distribution is found to be of the Planckian type independently of the initial one. We solve the equation, generally and obtain the time evolution for an arbitrary initial distribution. In particular we look at an initially thermal, Poisson, or pure state distribution. For the thermal one we find that its shape is preserved during the cooling. The results are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00902273
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  • 29
    Digitale Medien
    Digitale Medien
    Direct high-resolution excimer laser photoetching (1984)
    Springer
    Applied physics 33 (1984), S. 195-198 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Direct high-resolution photoetching of various resists and polymers has been demonstrated using an ArF excimer laser at 193 nm. Features as small as 0.3 μm have been produced in 1 μm thick films with no subsequent wet processing steps necessary.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00618755
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  • 30
    Digitale Medien
    Digitale Medien
    Selective reflection from high-pressure mercury vapor (1980)
    Springer
    Applied physics 21 (1980), S. 77-81 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 32 ; 34 ; 35
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Selective regular reflection in the neighborhood of the 253.7 nm mercury resonance line was investigated in the pressure range extending up to 700 bar by applying a new technology, an internally heated autoclave with a window of synthetic sapphire. The measurements yield the maximum of spectral reflectance, which was shown to be constant up to a density of about 1018 cm−3, first to arise and then to fall off with increasing pressure. In this density range the impact theory of resonance broadening and the classical equations of anomalous dispersion are no longer valid and a statistical theory of multilateral dipole-dipole interactions should be developed to describe the reflection profiles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886485
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  • 31
    Digitale Medien
    Digitale Medien
    Two-photon resonant four-wave mixing processes in atomic barium (1980)
    Springer
    Applied physics 23 (1980), S. 333-339 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.65 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract By means of a N2-laser pumped dye-laser (P L ≈20kW, Δv L 〈 10 GHZ) different two-photon resonant four-wave coupling processes in Ba vapour (n Ba≈1016 cm−3) using the Ba states 6s8s 1 S o and 7s5d 1 D 2 were investigated. Coherent line radiation with conversion rates up to 10−3 was generated within the range of λ=190–200 nm by sumfrequency mixingv UV=2v 1+v 2 of 3 laser photons and within the range of λ=250–380 nm by couplingv UV=2v 1±v IR of 2 laser photons with one photonv IR stimulated emitted in laser-induced Ba transitions. For the second coupling type the various nonlinear processes contributing to the formation of the coupling components are discussed. The power of the UV-component as function of inensity and resonance detuning of the laser as well as on the phase-mismatch was calculated on the basis of the small signal theory and compared to the experimental data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00914920
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