Interference phenomena in two-photon transitions caused by laser-induced ac-Stark effect

A system is described in which a real molecular state is tuned into and out of resonance with the intermediate level of a two-photon transition, by the laser-induced ac-Stark effect. Two narrow-band CO2 wave-guide lasers are utilized to induce rovibrational transitions in the ν3 ladder of SF6. A weak probe laser monitors the absorption for the [Formula: see text] two-photon transition. Simultaneously, a strong pump laser is in resonance with the [Formula: see text] one-photon transition. The ac-Stark splitting is observed and quantum interferences between two-photon amplitudes involving different intermediate states occur. It is demonstrated that destructive interference allows suppression of the two-photon excitation for an appropriate pump laser power. Simulations based on the Dressed State Picture and the optical Bloch equations show a satisfactory agreement with the experiment.

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Resonance fluorescence spectra from a three level atom interacting with a strong bichromatic field: induced two photon transitions

Canadian Journal of Physics ◽

10.1139/p83-003 ◽

1983 ◽

Vol 61 (1) ◽

pp. 15-29 ◽

Cited By ~ 2

Author(s):

Douglas A. Hutchinson ◽

Christine Downie ◽

Constantine Mavroyannis

Keyword(s):

Ground State ◽

Rabi Frequency ◽

Resonance Fluorescence ◽

Excitation Spectra ◽

Laser Fields ◽

Two Photon ◽

Photon Transition ◽

Level Atom ◽

Photon Excitation ◽

The One

This investigation describes the interaction of a three level atom with two laser fields. One of the transitions from the ground state is in resonance with twice the frequency of the first laser and the other transition from the ground state is in resonance with the second laser. The Green's function formalism is used to derive expressions from which the induced two photon and one photon excitation spectra are computed. Also, approximate expressions are derived for the excitation spectra in the appropriate frequency regions. These results agree well with the numerical computations based upon the precise expressions. The interference between the two transitions produce some splittings; these splittings depend upon the Rabi frequency of the one photon transition. The intensities of the weak peaks depend upon the ratio of the Rabi frequency of the two photon transition to the frequency of the first laser. Some features of the excitation spectra are interpreted in terms of previous knowledge about the behavior of two level atoms in strong laser fields.

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Two-photon ac-Stark effect in Raman-Ramsey Interactions

2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum ◽

10.1109/freq.2007.4319028 ◽

2007 ◽

Author(s):

Junhai Zhang ◽

Jingbiao Chen

Keyword(s):

Stark Effect ◽

Two Photon ◽

Ac Stark Effect

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ac Stark effect for a two-level atom in a squeezed vacuum via a two-photon process

The European Physical Journal D ◽

10.1007/s100530050355 ◽

1999 ◽

Vol 7 (1) ◽

pp. 117-121 ◽

Cited By ~ 1

Author(s):

Xun-Li Feng ◽

Zhao-Yang Chen ◽

Zhi-Zhan Xu

Keyword(s):

Stark Effect ◽

Two Photon ◽

Squeezed Vacuum ◽

Level Atom ◽

Photon Process ◽

Ac Stark Effect

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Нелинейное просветление InAs нитевидных нанокристаллов в видимом диапазоне

Журнал технической физики ◽

10.21883/os.2020.01.48849.263-19 ◽

2020 ◽

Vol 128 (1) ◽

pp. 128

Author(s):

А.С. Кулагина ◽

А.И. Хребтов ◽

А.А. Рыжов ◽

В.В. Данилов ◽

И.В. Штром ◽

...

Keyword(s):

Room Temperature ◽

Molecular Beam ◽

Stark Effect ◽

Visible Range ◽

Bohr Radius ◽

Two Photon ◽

Photon Excitation ◽

Dynamic Stark Effect ◽

Inas Nanowires ◽

Characteristic Maximum

The spectral and nonlinear optical properties of InAs nanowires suspensions in isopropanol were studied at room temperature. InAs nanowires were synthesized by molecular beam epitaxy. The absorption spectra of suspensions with a characteristic maximum at a wavelength of 235 nm were obtained, as well as Raman spectra in the range 180–280 cm – 1. The nonlinear transmission of InAs nanowires with a diameter less than the Bohr radius of the exciton upon two-photon excitation in the transparency region in the visible range (λ = 468 nm) was studied firstly. The effect of cumulative bleaching was discovered, the manifestation of which is associated with the dynamic Stark effect.

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