arXiv:1603.00970 · Journal of the Optical Society of America B

An inverted crossover resonance aiding laser cooling of ^171Yb

John J. McFerran

Published May 24, 2016• 12 citations

Abstract

We observe an inverted crossover resonance in π-driven four-level systems, where F′−F=0,+1. The signal is observed through saturated absorption spectroscopy of the (6s2)S01−(6s6p)P13 transition in Yb171, where the nuclear spin I=1/2. The enhanced absorption signal is used to generate a dispersive curve for 556 nm laser frequency stabilization and the stabilized light cools Yb171 atoms in a two-stage magneto-optical trap, achieving temperatures of 20 μK. The Doppler-free spectroscopy scheme is further used to measure isotopic frequency shifts and hyperfine separations for the inter-combination line in ytterbium.

DOI: 10.1364/josab.33.001278

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arXiv:1603.00970 · Journal of the Optical Society of America B

An inverted crossover resonance aiding laser cooling of ^171Yb

John J. McFerran

Published May 24, 2016• 12 citations

arXiv HTML PDF

Abstract

DOI: 10.1364/josab.33.001278

Related papers

Anomalous saturated absorption providing a stable laser lock for $^{171}$ Yb laser coolingAnomalous saturated absorption providing a stable laser lock for $^{171}$Yb laser cooling

John J. McFerran

We identify an inverted Lamb dip in the saturated absorption spectroscopy of the $(6s^{2})$ $^{1}S_{0}$ $-$ $(6s6p)$ $^{3}P_{1}$ transition in $^{171}$ Yb. The signal has only been observed with the two hyperfine lines of this spin $I=\frac{1}{2}$ isotope. For both lines the application of a dc magnetic field transforms a two-level scheme into a four-level scheme, with degeneracy only marginally lifted in the ground state. The atoms are excited through $\pi$ transitions, while the de-excitation process completes a simple optical pumping scheme. However, the full explanation of the enhanced absorption is yet to be determined. The anomalous absorption signal is used to generate a dispersive curve for 556 nm laser stabilisation and the stabilised light cools $^{171}$ Yb atoms in a two-stage magneto-optical trap, achieving temperatures below 50 $\mu$ K. The Doppler-free spectroscopy scheme is further used to measure isotopic frequency shifts and hyperfine separations for the intercombination line in Yb.We identify an inverted Lamb dip in the saturated absorption spectroscopy of the $(6s^{2})$ $^{1}S_{0}$ $-$ $(6s6p)$ $^{3}P_{1}$ transition in $^{171}$Yb. The signal has only been observed with the two hyperfine lines of this spin $I=\frac{1}{2}$ isotope. For both lines the application of a dc magnetic field transforms a two-level scheme into a four-level scheme, with degeneracy only marginally lifted in the ground state. The atoms are excited through $\pi$ transitions, while the de-excitation process completes a simple optical pumping scheme. However, the full explanation of the enhanced absorption is yet to be determined. The anomalous absorption signal is used to generate a dispersive curve for 556 nm laser stabilisation and the stabilised light cools $^{171}$Yb atoms in a two-stage magneto-optical trap, achieving temperatures below 50 $\mu$K. The Doppler-free spectroscopy scheme is further used to measure isotopic frequency shifts and hyperfine separations for the intercombination line in Yb.

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arXiv:1611.03249Journal of Physics B Atomic Molecular and Optical PhysicsJul 14, 20176 citations

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We demonstrate the presence of inverted crossover resonances (ICRs) in the intercombination line of171Yb (I=1/2) with the use of saturated fluorescence spectroscopy on an atomic beam. The principal lines involved in the crossover are symmetrically separated Zeeman transitions. The signals are observed for both the hyperfine lines of the171Yb1S0-3P1line. We use a four-level rate equation model to help validate the nature of the resonance. In the case of F'=3/2 (upper state) the resonance can be used to frequency stabilize laser light for laser cooling of171Yb. While that of the F'=1/2 ICR acts as a rather robust frequency reference with an overall fractional frequency uncertainty in the low 10-11range.We demonstrate the presence of inverted crossover resonances (ICRs) in the intercombination line of171Yb (I=1/2) with the use of saturated fluorescence spectroscopy on an atomic beam. The principal lines involved in the crossover are symmetrically separated Zeeman transitions. The signals are observed for both the hyperfine lines of the171Yb1S0-3P1line. We use a four-level rate equation model to help validate the nature of the resonance. In the case of F'=3/2 (upper state) the resonance can be used to frequency stabilize laser light for laser cooling of171Yb. While that of the F'=1/2 ICR acts as a rather robust frequency reference with an overall fractional frequency uncertainty in the low 10-11range.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Jul 1, 20170 citations

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Chad Hoyt, Zeb W. Barber, Chris W. Oates +3 more

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arXiv:physics/0503240Physical Review LettersAug 19, 2005122 citations

Magic wavelengths of the Yb (6s2 S01–6s6p P13) intercombination transition

T. A. Zheng, Yutong Yang, Marianna S. Safronova +4 more

We calculate and measure the magic wavelengths for the $6{s}^{2}^{1}S_{0}\ensuremath{-}6s6p\phantom{\rule{0.16em}{0ex}}^{3}P_{1}$ intercombination transition of the neutral ytterbium atom. The calculation is performed with the ab initio configuration interaction $+$ all-order method. The measurement is done with laser spectroscopy on cold atoms in an optical dipole trap. The magic wavelengths are determined to be 1035.68(4) nm for the $\ensuremath{\pi}$ transition $(\mathrm{\ensuremath{\Delta}}m=0)$ and 1036.12(3) nm for the $\ensuremath{\sigma}$ transitions $(|\mathrm{\ensuremath{\Delta}}m|=1)$ in agreement with the calculated values. Laser cooling on the narrow intercombination transition could achieve better results for atoms in an optical dipole trap when the trap wavelength is tuned to near the magic wavelength.We calculate and measure the magic wavelengths for the $6{s}^{2}^{1}S_{0}\ensuremath{-}6s6p\phantom{\rule{0.16em}{0ex}}^{3}P_{1}$ intercombination transition of the neutral ytterbium atom. The calculation is performed with the ab initio configuration interaction $+$ all-order method. The measurement is done with laser spectroscopy on cold atoms in an optical dipole trap. The magic wavelengths are determined to be 1035.68(4) nm for the $\ensuremath{\pi}$ transition $(\mathrm{\ensuremath{\Delta}}m=0)$ and 1036.12(3) nm for the $\ensuremath{\sigma}$ transitions $(|\mathrm{\ensuremath{\Delta}}m|=1)$ in agreement with the calculated values. Laser cooling on the narrow intercombination transition could achieve better results for atoms in an optical dipole trap when the trap wavelength is tuned to near the magic wavelength.

arXiv:2011.06759Physical Review ADec 2, 20209 citations

Anomalous saturated absorption providing a stable laser lock for

^{171}

Yb laser cooling

We identify an inverted Lamb dip in the saturated absorption spectroscopy of the

(6s^{2})

^{1}S_{0}

-

(6s6p)

^{3}P_{1}

transition in

^{171}

Yb. The signal has only been observed with the two hyperfine lines of this spin

I=\frac{1}{2}

isotope. For both lines the application of a dc magnetic field transforms a two-level scheme into a four-level scheme, with degeneracy only marginally lifted in the ground state. The atoms are excited through

\pi

transitions, while the de-excitation process completes a simple optical pumping scheme. However, the full explanation of the enhanced absorption is yet to be determined. The anomalous absorption signal is used to generate a dispersive curve for 556 nm laser stabilisation and the stabilised light cools

^{171}

Yb atoms in a two-stage magneto-optical trap, achieving temperatures below 50

\mu

K. The Doppler-free spectroscopy scheme is further used to measure isotopic frequency shifts and hyperfine separations for the intercombination line in Yb.

+

all-order method. The measurement is done with laser spectroscopy on cold atoms in an optical dipole trap. The magic wavelengths are determined to be 1035.68(4) nm for the $\ensuremath{\pi}$ transition $(\mathrm{\ensuremath{\Delta}}m=0)$ and 1036.12(3) nm for the $\ensuremath{\sigma}$ transitions $(|\mathrm{\ensuremath{\Delta}}m|=1)$ in agreement with the calculated values. Laser cooling on the narrow intercombination transition could achieve better results for atoms in an optical dipole trap when the trap wavelength is tuned to near the magic wavelength.