Professor Vladimir Chulanovski 1889–1969

El'yashevich, M A

doi:10.1016/0584-8539(70)80170-2

Cited by 2 publications

(2 citation statements)

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“…The Raman Stokes frequencies ν s =ν p -ν r and vibration frequencies ν v =ν 00 -ν r of R6G molecules can be calculated as difference between pump radiation frequency ν p or frequency of the 00 electron transition ν 00 respectively and molecule vibrational frequencies ν r [7,8]. The 00 electron transition frequency can be defined according to [9] via absorption spectrum k(ν) and luminescence spectrum I L (ν) as intersection of k(ν)/ν and I L (ν)/ν 4 dependencies.…”

Section: Resultsmentioning

confidence: 99%

Lasing of 2D short-range photonic crystals made of dyed vesicular polymer

Yashchuk

Tikhonov²,

Prygodiuk

et al. 2007

SPIE Proceedings

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The random lasing of R6G-dyed vesicular polymeric films was investigated. The short-range ordering of vesicles allows classifying the films as 2D short-range photonic crystals. Nevertheless the ordering causes neither resonant nor interference conditions in this medium but the films reveal good lasing parameters: low lasing threshold and high luminescence-to-lasing transition rate. The obtained lasing spectra reveal quasi-linear structure when pump intensity is considerably above the lasing threshold and the dye concentration is over2*10 -3 M/l. All spectral lines are good reproducible from shot to shot. The dye concentration as well as pump intensity do not influence the frequencies of spectral lines. In the absence of any resonant conditions, we discuss the latent vibronic structure of the fluorescence spectrum and Raman scattering revealing as the most probable reasons for the random lasing spectrum structure. The Raman and vibronic frequencies are compared with the observed lasing spectrum lines. Good correlation between the lasing and Raman frequencies is shown. The mechanism of the quasi-linear lasing spectrum formation by amplification of the combined radiation of resonant Raman scattering and luminescence up to saturation is proposed. The random lasing spectrum in diffusive regime is denoted to provide a new way of laser dye Raman scattering investigation.

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Section: Resultsmentioning

confidence: 99%

Lasing of 2D short-range photonic crystals made of dyed vesicular polymer

Yashchuk

Tikhonov²,

Prygodiuk

et al. 2007

SPIE Proceedings

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“…where B = 0.007 35 eV is the rotational constant and r is the rotational quantum number [39]. Only the first three levels (r = 0, 1, 2) are taken into account.…”

Section: H 2 Rotational Excitationmentioning

confidence: 99%

A theoretical and experimental study of a Penning recombination laser operating in a hollow cathode discharge

Petrov¹

1997

J. Phys. D: Appl. Phys.

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A theoretical and experimental study of a Penning recombination laser operating in the negative glow plasma of a pulsed high-voltage hollow cathode discharge at intermediate pressures is presented. A detailed kinetic model of the plasma - chemical reactions and radiative processes determining the inversion population on the transition is developed and the time-dependent behaviour of both the plasma and laser parameters (excited states populations, electron and ion densities, electron and gas temperatures, output power and gain) is numerically calculated. An extended experimental investigation of the main plasma and laser parameters is made and a comparison with theoretical results is presented.

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Professor Vladimir Chulanovski 1889–1969

Cited by 2 publications

References 0 publications

Lasing of 2D short-range photonic crystals made of dyed vesicular polymer

Lasing of 2D short-range photonic crystals made of dyed vesicular polymer

A theoretical and experimental study of a Penning recombination laser operating in a hollow cathode discharge

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