Phase-sensitive ionization through multiphoton-excitation schemes involving even numbers of photons

Papastathopoulos, Evangelos; Xenakis, D.; Charalambidis, D.

doi:10.1103/physreva.59.4840

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…We have thus undertaken the study of the line shape of the 3p 2 ( 1 S e ) autoionizing resonance of atomic Magnesium under the simultaneous excitation by four-and two-photon transitions whose relative phase is varied. This case [11] is somewhat different a permanent address: Institute for Space Sciences, P.O. Box MG-23, Ro 77125, Bucharest-Mȃgurele, Romania from, and theoretically a bit more demanding, than the more standard scheme of one-and three-photon transitions, which in any case would not be applicable here owing to the parity of the resonance which is the same as that of the ground state.…”

Section: Introductionmentioning

confidence: 94%

Coherent phase control in ionization of Magnesium by a bichromatic laser field of frequencies ωand 2ω

Buica-Zloh,

Nikolopoulos

2013

Preprint

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We have investigated the coherent phase control on the 3p 2 autoionizing state (AIS) resonantly coupled with the ground state for Mg through a two-and a four-photon transition simultaneously, using a bichromatic linearly polarized laser field. The frequency is chosen such that the lasers are tunable around resonance with the transition 3s 2 ( 1 S e ) → 3p 2 ( 1 S e ), which implies ω f = 2.11 eV and ω h = 4.22 eV. We are interested in the modification of autoionizing (AI) line shape through the relative phase and laser intensities. A strong phase dependence on the total ionization yield and ionization rate is found. We also performed a time-dependent calculation which takes into consideration all the resonant states of the process.

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Section: Introductionmentioning

confidence: 94%

Coherent phase control in ionization of Magnesium by a bichromatic laser field of frequencies ωand 2ω

Buica-Zloh,

Nikolopoulos

2013

Preprint

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“…We note that until recently in all of the experiments of two-colour coherent control, the control scenario involved the fundamental frequency and either the second [30] or the third harmonic [31]. However, recently a scenario where a combination of a two-photon and a fourphoton transition is used for two-colour coherent control has been experimentally demonstrated [32].…”

Section: Con C Lu Sion Smentioning

confidence: 99%

Coherent control of spontaneous emission in a four-level system

Paspalakis¹

2000

Journal of Modern Optics

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Abs trac t.In this article we study the potential for coherently control spontaneous emission in a four-level scheme. Our control parameter is the relative phase of two laser ® elds having the same angular frequency. We investigate in detail the trapping conditions, the population dynamics and the behaviour of the (long time) spontaneous emission spectrum, which are now phase dependent. Inhibition of spontaneous emission and extreme spectral narrowing are shown as the relative phase is varied. Our results are interpreted using a dressed state analysis of the dynamics. In trod u c tionT here are two basic methods that could be used in order to modify (or control) spontaneou s emission of a multi-level atom. T he ® rst one relies on passive control and it is achieved by placing the atoms within reservoirs whose density of modes is dramatically di erent from that of free space vacuum. Such control can be realized in cases where atoms interact with microcavities [1± 3] or photonic band gap materials [4± 7]. T he second method uses active control and it is realized by using the properties of coherent (optical, microwave or radio-frequency) [8± 19] or incoherent [20, 21] ® elds. For the speci® c case of coherent ® elds it was known that control could be achieved by either varying the frequency (which leads to changes of the detuning) or by varying the intensity (which leads to changes of the Rabi frequency). In addition to this, it has only been recently realized that spontaneou s emission can also be e ciently controlled using phase control techniques [22± 28], where the phase of the driving coherent ® eld(s) is appropriately exploited in order to modify the spontaneou s emission dynamics.In this article we continue our investigation of coherent`phase' control of spontaneou s emission [24± 26] and study the potential for coherent control of a four-level quantum system, using the relative phase between two lasers with equal frequencies ! aˆ!bˆ! , which couple the ground state with the two excited states (as displayed in ® gure 1). T hese laser ® elds may be distinguished by their di erent transition characteristics , where it is possible to have a three (multi)-photon transition for laser ! a and a single photon transition for laser ! b using the corresponding harmonic. T his approach is usually referred to as the two-colour

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“…The latter corresponds to control of photoionization and photodissociation yields. There are only very few experiments dealing with coherent control of frequency conversion [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Coherent control of frequency conversion toward short (picosecond) vacuum-ultraviolet radiation pulses

2010

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We present experimental data on the coherent control of frequency conversion toward the vacuum-ultraviolet regime in xenon atoms, applying intense ultrashort picoseconds (ps) radiation pulses. We report on quantum interference between two resonantly enhanced frequency conversion processes (i.e., fifth harmonic generation and four-wave mixing). The conversion processes are driven by a fundamental (ps) laser pulse at 530 nm and the phase-locked second harmonic at 265 nm. Both fifth harmonic generation and four-wave mixing yield vacuum-ultraviolet radiation at 106 nm. The two frequency conversion pathways interfere with each other-either constructively or destructively, depending on the relative phase of the driving laser pulses. Thus, by variation of the relative phase, we substantially enhance or reduce the conversion efficiency (i.e., the yield of generated vacuum-ultraviolet radiation).

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Phase-sensitive ionization through multiphoton-excitation schemes involving even numbers of photons

Cited by 16 publications

References 16 publications

Coherent phase control in ionization of Magnesium by a bichromatic laser field of frequencies ωand 2ω

Coherent phase control in ionization of Magnesium by a bichromatic laser field of frequencies ωand 2ω

Coherent control of spontaneous emission in a four-level system

Coherent control of frequency conversion toward short (picosecond) vacuum-ultraviolet radiation pulses

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