Velocity Selective Optical Pumping of Rb Hyperfine Lines Induced by a Train of Femtosecond Pulses

Aumiler, Damir; Ban, Ticijana; Skenderović, Hrvoje; Pichler, Goran

doi:10.1103/physrevlett.95.233001

Cited by 46 publications

(31 citation statements)

References 24 publications

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“…This velocity also limits the interaction time in the far-UV laser beam. However, because this Doppler profile is still narrow compared to the frequency comb spacing f r of 500 MHz, we do not expect complications such as the complex lineshapes arising from velocity-selective optical pumping that have been observed in room-temperature gases [22,34].…”

Section: Dfcs Measurement Of Thementioning

confidence: 99%

“…Both one-and two-photon transitions have been demonstrated in DFCS between low-lying states of alkali atoms [19,20,21,22]. Although a typical frequency comb has 10 4 − 10 5 frequency-domain teeth spanning a wavelength range from 750-850 nm or more, usually only a single tooth of the comb is useful for exciting one-photon transitions (an exception is the case of room-temperature Doppler-broadened spectra, for which several teeth can contribute to coherent velocity-selection effects [22,34]). In the two-photon case there are two quite distinct limiting cases.…”

Section: Dfcs and Uv Frequency Combsmentioning

confidence: 99%

“…The self-calibrating capability of the comb permits accurate determination of atomic structure in alkali and alkaline earth atoms [19,20,21,22,23,24], as well as the investigation of multiple molecular transitions [25]. Furthermore, high-resolution quantum control can be achieved via spectral manipulation of frequency combs [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy

et al. 2007

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Abstract. We analyze several possibilities for precisely measuring electronic transitions in atomic helium by the direct use of phase-stabilized femtosecond frequency combs. Because the comb is self-calibrating and can be shifted into the ultraviolet spectral region via harmonic generation, it offers the prospect of greatly improved accuracy for UV and far-UV transitions. To take advantage of this accuracy an ultracold helium sample is needed. For measurements of the triplet spectrum a magneto-optical trap (MOT) can be used to cool and trap metastable 2 3 S state atoms. We analyze schemes for measuring the two-photon 2 3 S → 4 3 S interval, and for resonant two-photon excitation to high Rydberg states, 2 3 S → 3 3 P → n 3 S, D. We also analyze experiments on the singlet-state spectrum. To accomplish this we propose schemes for producing and trapping ultracold helium in the 1 1 S or 2 1 S state via intercombination transitions. A particularly intriguing scenario is the possibility of measuring the 1 1 S → 2 1 S transition with extremely high accuracy by use of two-photon excitation in a magic wavelength trap that operates identically for both states. We predict a "triple magic wavelength" at 412 nm that could facilitate numerous experiments on trapped helium atoms, because here the polarizabilities of the 1 1 S, 2 1 S and 2 3 S states are all similar, small, and positive.

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Section: Dfcs Measurement Of Thementioning

confidence: 99%

Section: Dfcs and Uv Frequency Combsmentioning

confidence: 99%

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Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy

et al. 2007

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“…These effects have been investigated theoretically and experimentally for inhomogeneously broadened alkali-metal vapors in the case of one-and two-photon excitations [8][9][10][11]. Constructive and destructive interference was demonstrated for different velocity groups, leading to velocity-selective excitation of Doppler-broadened vapors [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Frequency-comb-induced radiative force on cold rubidium atoms

et al. 2014

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We experimentally investigate the radiative force and laser-induced fluorescence (LIF) in cold rubidium atoms induced by pulse-train (frequency-comb) excitation. Three configurations are studied: (i) single-pulse-train excitation, (ii) two in-phase counterpropagating pulse trains, and (iii) two out-of-phase counterpropagating pulse trains. In all configurations, measured LIF is in agreement with calculations based on the optical Bloch equations. The observed forces in the first two configurations are in qualitative agreement with the model(s) used for calculating mechanical action of a pulse train on atoms; however, this is not the case for the third configuration. Possible resolution of the discrepancy is discussed.

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“…In this context, the introduction of a second, cw laser opens new directions of investigation, with the narrowband laser assuming the role of a velocity-selective filter. In the case of onephoton transitions, velocity-selective spectroscopy has already been performed [8], and distinction between different hyperfine levels within the Doppler profile has been demonstrated [9].In this Letter, the scheme with a second, cw laser is applied to investigate two-photon transitions, achieving considerably improved spectral resolution when compared to the previously reported works on velocityselective spectroscopy with frequency combs [8,9]. We employ a diode laser and a 1 GHz Ti:sapphire laser to excite each step of the 5S-5P-5D two-photon transition in a rubidium vapor (Fig.…”

mentioning

confidence: 99%

Two-photon transitions driven by a combination of diode and femtosecond lasers

Moreno¹,

Nogueira²,

Felinto³

et al. 2012

Opt. Lett.

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We report on the combined action of a cw diode laser and a train of ultrashort pulses when each of them drives one step of the 5S-5P-5D two-photon transition in rubidium vapor. The fluorescence from the 6P(3/2) state is detected for a fixed repetition rate of the femtosecond laser while the cw-laser frequency is scanned over the rubidium D(2) lines. This scheme allows for a velocity selective spectroscopy in a large spectral range including the 5D(3/2) and 5D(5/2) states. The results are well described in a simplified frequency domain picture, considering the interaction of each velocity group with the cw laser and a single mode of the frequency comb.

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Velocity Selective Optical Pumping of Rb Hyperfine Lines Induced by a Train of Femtosecond Pulses

Cited by 46 publications

References 24 publications

Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy

Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy

Frequency-comb-induced radiative force on cold rubidium atoms

Two-photon transitions driven by a combination of diode and femtosecond lasers

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