Nonlinear optical susceptibility measurement at an autoionizing-like resonance in atoms

Dimov, S. S.; Pavlov, L. I.; Stamenov, K. V.; Altshuller, G. B.

doi:10.1007/bf00619900

Cited by 14 publications

(3 citation statements)

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“…First observation of quite efficient nonlinear frequency conversion when the levels of Fano type are laser-induced in continuum, are reported by our laboratory [1,2,3]. We should note, that this possibility of inducing a continuum structure, by laser field coupling with a lower lying bound state, was theoretically predicted in [4,5,6].…”

Section: Introductionmentioning

confidence: 65%

“…The ionization signal is averaged over 100 laser pulses. The heat pipe produced a sodium density ~ 2 x 10 14 atoms/cm 3 . A sensitivity of about 10 -2 in the measurement of the ionization enhancement was possible only by a careful optimization of experimental conditions, performed in order to minimize the background.…”

Section: Resultsmentioning

confidence: 99%

“…Efficient harmonic generation at laser-induced autoionizing state in continuum, were observed for the first time by our laboratory [1,2,3]. In this paper, nonlinear frequency mixing in alkali metal vapors at induced continuum structure in Na, are studied in detail.…”

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confidence: 91%

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Spectroscopy of laser-induced autoionizing nonlinear resonances in atomic systems

Pavlov

Kovachev

2015

J. Phys.: Conf. Ser.

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Abstract. Efficient harmonic generation at laser-induced autoionizing state in continuum, were observed for the first time by our laboratory [1,2,3]. In this paper, nonlinear frequency mixing in alkali metal vapors at induced continuum structure in Na, are studied in detail. Besides, measurement of nonlinear optical susceptibility at induced autoionizing resonance, is performed. Tunable ultraviolet radiations by four-photon processes near induced resonances are obtained. Estimations of the real and imaginary parts of the nonlinearities, are estimated. We will specially note, that the resonant photoabsorption of ions is experimentally investigated since it gives information about the autoionizing states, which is impossible to obtain on the base only of the emission spectra. We use also laser inducing for obtaining of powerful radiation source in VUV. Thus, many actual problems as the selective impact on matter, laser photochemistry and laser isotope separation are connected directly with the induced autoionizing nonlinear resonances. The main interest is to control the spectral characteristics of continuum. The discrete level from the continuum structure leads to appearance of asymmetrical autoionizing resonance onto the background of the broad-band absorption line.

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