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Physical Review A

ac Stark splitting in multiphoton excitation of atomic hydrogen in flames: Abnormal peak asymmetry due to pressure broadening

Albert M. F. Lau

Published May 1, 1986• 11 citations
Publisher

Abstract

The author develops a theory of ac Stark (or Autler-Townes) splitting occurring in double optical resonances, one of which is a two-photon transition. It includes both laser bandwidth and collisional broadening effects. Theoretical results are in excellent agreement with Goldsmith's observation of two-peaked structures in the multiphoton excitation spectra of atomic hydrogen in atmospheric-pressure flames. This is believed to be the first study demonstrating that the peak asymmetry in an ac Stark doublet can be reversed due to pressure broadening.

DOI
10.1103/physreva.33.3602

Related papers

Abnormal peak asymmetry in ac Stark doublets due to pressure broadening

Matthias Albert

This paper reports excellent agreement between theory and Goldsmith's unexpected observation of two-peaked resonance structures in the multiphoton excitation spectra of hydrogen atoms in a hydrogen-air diffusion flame.1 We show that the phenomenon is ac Stark (or Autler-Townes) splitting with abnormal peak asymmetry. This is the first study demonstrating that the peak asymmetry in an ac Stark doublet is reversed due to pressure broadening.

Conference on Lasers and Electro-Optics•Jan 1, 1986•0 citations

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A. M. F. Lau

The author investigates the Autler-Townes effect (also known as AC, optical or dynamical Stark splitting) on the Balmer- alpha transition of hydrogen in 0.5-5 Torr of helium. In the double optical resonance scheme. H(3p) is excited by absorption of two 243 nm photons and a 656 nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler-free or a 'Doppler-reduced' beam configuration, the required intensity of the 656 nm laser (0.2 cm -1 bandwidth) for observation of the Autler-Townes doublet has to be greater than 2*10 4 and 2*10 5 W cm -2 for 243 nm laser bandwidths of 0.1 and 0.5 cm -1 , respectively.

Journal of Physics B Atomic and Molecular Physics•Aug 14, 1987•0 citations

The Autler-Townes effect in hydrogen at low pressure

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The Autler‐Townes effect (also known as ac, optical or dynamical Stark splitting) on the Balmer‐α transition of hydrogen in 0.5–5 torr of helium is investigated. In the double optical resonance scheme, H(3p) is excited by absorption of two 243‐nm photons and a 656‐nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler‐free or a ‘‘Doppler‐reduced’’ beam configuration, the required intensity of the 656 nm laser (0.2 cm−1bandwidth) for observing the Autler‐Townes doublet has to be greater than 2×104 W/cm2 and 2×105 W/cm2 for a 243‐nm laser bandwidth of 0.1 cm−1 and 0.5 cm−1, respectively.

AIP conference proceedings•Jan 1, 1988•0 citations

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•Jan 1, 1999•0 citations

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We experimentally study the ac Stark splitting in D 2 line of cold 87 Rb atoms. The frequency span between the Autler–Townes doublets is obviously larger than that derived from theoretical calculation. Two physical effects, which increase the effective Rabi frequency, contribute to the splitting broadening. First, atoms tend to distribute in strong field places of a inhomogeneous red-detuned light field. Second, atoms reabsorb scattered light when they are huge in number and high in density.

Chinese Physics Letters•Jun 16, 2005•4 citations

Abnormal phenomenon of ac Stark splitting in magneto-optical traps

Shuyu Zhou, 徐震, 周善钰 +1 more

We experimentally study the ac Stark splitting in D2 line of cold Rb-87 atoms. The frequency span between the Autler-Townes doublets is obviously larger than that derived from theoretical calculation. Two physical effects, which increase the effective Rabi frequency, contribute to the splitting broadening. First, atoms tend to distribute in strong lield places of a inhomogeneous red-detuned light field. Second, atoms reabsorb scattered light when they are huge in number and high in density.

Chinese Physics Letters•Jan 1, 2005•0 citations
The author develops a theory of ac Stark (or Autler-Townes) splitting occurring in double optical resonances, one of which is a two-photon transition. It includes both laser bandwidth and collisional broadening effects. Theoretical results are in excellent agreement with Goldsmith's observation of two-peaked structures in the multiphoton excitation spectra of atomic hydrogen in atmospheric-pressure flames. This is believed to be the first study demonstrating that the peak asymmetry in an ac Stark doublet can be reversed due to pressure broadening.
The author investigates the Autler-Townes effect (also known as AC, optical or dynamical Stark splitting) on the Balmer- alpha transition of hydrogen in 0.5-5 Torr of helium. In the double optical resonance scheme. H(3p) is excited by absorption of two 243 nm photons and a 656 nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler-free or a 'Doppler-reduced' beam configuration, the required intensity of the 656 nm laser (0.2 cm -1 bandwidth) for observation of the Autler-Townes doublet has to be greater than 2*10 4 and 2*10 5 W cm -2 for 243 nm laser bandwidths of 0.1 and 0.5 cm -1 , respectively.
The Autler‐Townes effect (also known as ac, optical or dynamical Stark splitting) on the Balmer‐α transition of hydrogen in 0.5–5 torr of helium is investigated. In the double optical resonance scheme, H(3p) is excited by absorption of two 243‐nm photons and a 656‐nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler‐free or a ‘‘Doppler‐reduced’’ beam configuration, the required intensity of the 656 nm laser (0.2 cm−1bandwidth) for observing the Autler‐Townes doublet has to be greater than 2×104 W/cm2 and 2×105 W/cm2 for a 243‐nm laser bandwidth of 0.1 cm−1 and 0.5 cm−1, respectively.
In recent years, coherent effects in atomic and molecular systems have been studied extensively, especially in several new classes of effects, such as lasing without inversion (LWI), electromagnetically induced transparency (EIT), coherent population trapping (CPT), AC Stark effect and Autler-Townes (AT) splitting in multilevel systems. The AC stark effect and Autler-Townes splitting in molecules have only been investigated recently. We demonstrate AC stark effect and Autler-Townes (AT) splitting in a lithium molecule using cw multi-photon spectroscopy. The excited upper level of the G1PigG^{1}\\Pi_{g}G1Pig​ is prepared by the optical-optical double resonance (OODR) excitation. The OODR line is split in the presence of a third coupling laser, which couples the upper level to an another intermediate level when the coupling laser is on or near resonance transition. The AT line shape consists of the superposition of ∣MJ∣|M_{J}|∣MJ​∣ components which have been resolved for G1Pig(v=12,J=3,f)G^{1}\\Pi_{g}(v=12, J=3,f)G1Pig​(v=12,J=3,f). We find that the AT splittingis linearly proportional to ∣MJ∣|M_{J}|∣MJ​∣, which allows the excitation of molecules with a selected ∣MJ∣|M_{J}|∣MJ​∣ level. The AC Stark shift of the OODR line is observed when the coupling laser is detuned from the resonance transition.