Efficient tunable tripler of optical frequency at an autoionizing-like resonance in a continuum

Pavlov, L. I.; Dimov, S. S.; Metchkov, D.I.; Mileva, G.M.; Stamenov, K. V.; Altshuller, G. B.

doi:10.1016/0375-9601(82)90808-8

Cited by 45 publications

(15 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: 64%

“…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.…”

mentioning

confidence: 92%

“…When the continuum is structured by induced autoionizing state, it is possible to obtain high efficiency of the nonlinear optical processes in atomic systems. Concerning the first experimental evidence of induced autoionizing state, we can characterize this process of efficient tripling [1] -as resonant third harmonic generation in sodium. The experimental research of autoionizing-like states can also require a measurement of other atomic properties such as the birefringence, the dichroism, and especially the efficiency of harmonics generation, which can be tested experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…If the continuum structure is induced [5], then the photoexcitation rate can be greatly enhanced and such resonant structure becomes important [5] under strong laser field excitation. According to the experimental study [1], a gain of the output THG (third harmonic generation) is much more times efficient due to the induced nonlinear optical resonances in continuum.…”

Section: Introductionmentioning

confidence: 99%

“…We can consider, that after the first experimental confirmation of high efficient third harmonic generation [1] near laser-induced autoionizing ( AI ) state, such strongly resonant phenomena were consequently obtained in a number of coherently excited atomic systems. Our conclusion, is that due to the first experimental efforts -it was created indeed a new quite active scientific field as Resonant Autoionization Laser Spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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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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