Parametric investigation of a pulsed nonchain HF laser

Baranov, V Yu; Высикайло, Ф. И.; Dem'yanov, A V; Malyuta, D D; Tolstov, V F

doi:10.1070/qe1984v014n06abeh005164

Cited by 16 publications

(14 citation statements)

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“…Cross sections for proton and Compton scattering at 90 ± c.m. from the present experiment (solid circles) compared with results from other laboratories [1,[11][12][13][14][15][16]21] -see legend.…”

Section: (Received 25 August 1995)mentioning

confidence: 98%

“…A number of measurements of proton Compton scattering have been reported [1,[11][12][13][14][15][16], and several authors of dispersion calculations have pointed out a significant inconsistency between many of these experiments and p photoproduction data near the peak of the D [3,[8][9][10]. Compton scattering can be described by six independent amplitudes.…”

Section: (Received 25 August 1995)mentioning

confidence: 99%

“…These can be grouped into two general categories, those based on the baryon resonance spectrum or its underlying quark structure [5][6][7], and those relying upon unitarity and dispersion relations to phenomenologically describe elastic scattering in terms of photopion production [3,4,8-10]. These calculations give significantly different predictions, particularly in the region of the D resonance.A number of measurements of proton Compton scattering have been reported [1,[11][12][13][14][15][16], and several authors of dispersion calculations have pointed out a significant inconsistency between many of these experiments and p photoproduction data near the peak of the D [3,8-10]. Compton scattering can be described by six independent amplitudes.…”

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confidence: 99%

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Polarized Compton Scattering from the Proton

et al. 1996

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New precision measurements of cross sections and polarization asymmetries in the p͑ g, gp͒ reaction at 90 ± c.m. are presented for incident energies between 213 and 333 MeV. A long-standing problem with earlier experiments that appeared to violate unitarity at the peak of the D is resolved. Data are compared to theories based on baryon resonance structure and to dispersion relations. Recent calculations using the proton polarizabilities are closest to the data, although inconsistencies are observed near the D resonance. PACS numbers: 13.60.Fz, 13.88.+e, 14.20.Gk, 25.20.Dc Elastic (Compton) scattering of intermediate energy photons from the proton is a potentially rich source of structure information. It is sensitive to the proton's electric (a) and magnetic (b) polarizabilities [1], to the deformation of the nucleon through the electric gND coupling [2], and even to the sign of the p 0 decay constant, F p [3,4]. There are many published calculations for Compton scattering. These can be grouped into two general categories, those based on the baryon resonance spectrum or its underlying quark structure [5][6][7], and those relying upon unitarity and dispersion relations to phenomenologically describe elastic scattering in terms of photopion production [3,4,8-10]. These calculations give significantly different predictions, particularly in the region of the D resonance.A number of measurements of proton Compton scattering have been reported [1,[11][12][13][14][15][16], and several authors of dispersion calculations have pointed out a significant inconsistency between many of these experiments and p photoproduction data near the peak of the D [3,8-10]. Compton scattering can be described by six independent amplitudes. Their imaginary parts can be calculated from (g, p) multipoles using s-and u-channel unitarity, and dispersion integrals can be written for their real parts. Four of these integrals converge rapidly with energy. However, the remaining two, those involving a photon helicity flip, do not converge rapidly, making subtractions essential. One of these is dominated by t-channel p 0 exchange, the Low amplitude [17], and can be readily evaluated in terms of the p 0 lifetime. However, the other contains contributions from multiple meson exchange in the t channel that are quite poorly determined. In principle, the beam-polarization asymmetry constrains this other amplitude [4]. But prior to our new measurements, only a single datum with large errors had been published for this observable [18]. Alternatively, sum rules can be used to write the subtraction function for this spin-flip amplitude in terms of the difference of the proton polarizabilities, a 2 b, which can then be fixed by fitting a perturbative expansion of the cross section to data below the p threshold [3,4]. Although this provides a good description of scattering below the D [1,19], the peak cross sections appear to be overestimated [3,4].A lower unitarity bound on the Compton cross sections, which avoids the uncertainties of the dispersion calcul...

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Section: (Received 25 August 1995)mentioning

confidence: 98%

Section: (Received 25 August 1995)mentioning

confidence: 99%

mentioning

confidence: 99%

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Polarized Compton Scattering from the Proton

et al. 1996

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“…This fact proves the high uniformity of energy deposition into the active medium under REP DD pumping. It is knowledge that cascade transitions do not occur in a non-uniform discharge and the radiation pulse exhibits the well pronounced spike-mode character 26,27 . Cascade transitions increase the efficiency of energy extraction from the active medium of non-chain chemical lasers, because a single excited molecule HF (v=3) or DF (v=4), where v is the vibrational quantum number, may emit up to three photons.…”

Section: Non-chain Chemical Hf(df) Lasersmentioning

confidence: 99%

Efficient gas lasers pumped by run-away electron preionized diffuse discharge

et al. 2015

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It was shown that run-away electron preionized volume (diffuse) discharge (REP DD) can be used as an excitation source of active gas mixtures at elevated pressures and can produce laser emission.We report experimental and calculated results of application of the REP DD for excitation of different active gas mixtures. It was shown that the REP DD allows to obtain efficient lasing stimulated radiation in the IR, visible and UV spectral ranges.Kinetic model of the REP DD in mixtures of nitrogen with SF 6 is developed allowing to predict the radiation parameters of nitrogen laser at 337.1 nm.Promising prospects of REP DD employment for exciting a series of gas lasers was demonstrated. Lasing was obtained on molecules N 2 , HF, and DF with the efficiency close to the limiting value. It was established that the REP DD is most efficient for pumping lasers with the mixtures comprising electro-negative gases.

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“…,34 . Cascade transitions increase the efficiency of energy extraction from the active medium of non-chain chemical lasers, because a single excited molecule HF (v=3) or DF (v=4), where v is the vibrational quantum number, may emit up to 3-4 photons.…”

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confidence: 95%

Gas lasers pumped by runaway electrons preionized diffuse discharge

et al. 2015

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It was shown that run-away electron preionized volume (diffuse) discharge (REP DD) can be used as an excitation source of gas mixtures at elevated pressures and can produce laser emission.We report experimental and simulated results of application of the REP DD for excitation of different active gas mixtures. Kinetic model of the REP DD in mixtures of nitrogen with SF 6 is developed allowing predicting the radiation parameters of nitrogen laser at 337.1 nm. Peculiarities of the REP DD development in different gas mixtures are studied, as well.It was shown that the REP DD allows obtaining efficient lasing stimulated radiation in the IR, visible and UV spectral ranges. New operation mode of nitrogen laser is demonstrated under REP DD excitation. Laser action on N 2 , HF, and DF molecules was obtained with the efficiency close to the limiting value.Promising prospects of REP DD employment for exciting a series of gas lasers was demonstrated. It was established that the REP DD is most efficient for pumping lasers with the mixtures comprising electro-negative gases.

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Parametric investigation of a pulsed nonchain HF laser

Cited by 16 publications

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Polarized Compton Scattering from the Proton

Polarized Compton Scattering from the Proton

Efficient gas lasers pumped by run-away electron preionized diffuse discharge

Gas lasers pumped by runaway electrons preionized diffuse discharge

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