Transverse laser cooling of ions in a storage ring

Calabrese, R.; Guidi, V.; Lenisa, P.; Mariotti, E.; Moi, L.

doi:10.1016/0030-4018(95)00547-1

Optics Communications

1996

DOI: 10.1016/0030-4018(95)00547-1

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Transverse laser cooling of ions in a storage ring

R. Calabrese

V. Guidi

P. Lenisa

et al.

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Cited by 5 publications

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“…Doppler cooling and its many extensions usually involve narrow-band, continuous-wave lasers that efficiently cool atoms within a narrow velocity range (∼ 1 m/s) that corresponds to the radiative linewidth of a typical atomic transition. To increase the velocity capture range, several laser cooling methods were investigated that modulate or effectively broaden a narrow-band laser [3,4,5,6,7,8]. Modelocked pulsed lasers have been used to narrow the velocity distribution of atomic beams within several velocity classes given by the bandwidth of each spectral component of the frequency comb [9,10].…”

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Broadband laser cooling of trapped atoms with ultrafast pulses

et al. 2006

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We demonstrate broadband laser cooling of atomic ions in an rf trap using ultrafast pulses from a modelocked laser. The temperature of a single ion is measured by observing the size of a timeaveraged image of the ion in the known harmonic trap potential. While the lowest observed temperature was only about 1 K, this method efficiently cools very hot atoms and can sufficiently localize trapped atoms to produce near diffraction-limited atomic images.PACS numbers: 32.80. Pj, 42.50.Vk Laser cooling of atoms [1,2] has become a cornerstone of modern day atomic physics. Doppler cooling and its many extensions usually involve narrow-band, continuous-wave lasers that efficiently cool atoms within a narrow velocity range (∼ 1 m/s) that corresponds to the radiative linewidth of a typical atomic transition. To increase the velocity capture range, several laser cooling methods were investigated that modulate or effectively broaden a narrow-band laser [3,4,5,6,7,8]. Modelocked pulsed lasers have been used to narrow the velocity distribution of atomic beams within several velocity classes given by the bandwidth of each spectral component of the frequency comb [9,10]. In this letter we report the demonstration of Doppler laser cooling of trapped atoms with individual broadband light pulses from a modelocked laser.To efficiently capture and cool high-velocity atoms, it is necessary to achieve a laser bandwidth large enough to cover the large range of atomic Doppler shifts. For example, Cd + ions used in this experiment are initially created with an average kinetic energy of order 1 eV, which corresponds to an average velocity of about 1300 m/s and a Doppler shift of ∆ D ∼ 36 GHz. Power broadening an atomic transition (saturation intensity I s and natural linewidth γ) would require a laser intensity of2 , which can be prohibitively high. For Cd + (γ/2π ≃ 50MHz, I s ≃ 5000W/m 2 ) this requires I ∼ 10 10 W/m 2 . Modulating a narrow-band laser to generate high bandwidths would allow for significantly less laser power, but it is technically difficult to generate a 100 GHz wide modulation spectrum [4]. On the other hand, an ultrafast laser whose pulse is a few picoseconds long will naturally have a bandwidth in the above range, as well as sufficient intensity to excite the transition.The laser cooling rate depends critically on the photon scatter rate, which for a pulsed laser can be no larger than the laser repetition rate R (about 80 MHz for a typical modelocked laser), given that the atom is excited with unit probability by each pulse. We assume that once excited, the atom decays back to the ground state faster than the time period of the modelocked pulse train 1/R. In this case, the atom has little memory between pulses, or equivalently, the absorption spectrum is a single broad line of width ∆ ∼ 1/τ (τ is the pulse duration) and the frequency comb of spacing R has very little contrast.The equilibrium temperature for broadband pulsed laser cooling of trapped atoms is expected to scale approximately with the laser bandwidth ∆, a...

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Broadband laser cooling of trapped atoms with ultrafast pulses

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A storage ring for crystalline beam studies

Tecchio

Bisoffi

Ciullo

et al. 1997

Nuclear Instruments and Methods in Physics Research Section A:

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Atutov

Calabrese

Guidi

et al. 1997

Hyperfine Interactions

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Transverse laser cooling of ions in a storage ring

Cited by 5 publications

References 15 publications

Broadband laser cooling of trapped atoms with ultrafast pulses

Broadband laser cooling of trapped atoms with ultrafast pulses

A storage ring for crystalline beam studies

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