We demonstrate sawtooth wave adiabatic passage (SWAP) in a grating magneto-optical trap (MOT) operating on the $^1$ S $_0$ $\rightarrow$ $^3$ P $_1$ transition of neutral $^{88}$ Sr. From numerical simulations of SWAP using our laser beam geometry, we find that SWAP provides greater cooling than triangle wave frequency modulation despite the complex polarization environment of a grating MOT. The simulation is confirmed by our experimental results, where we demonstrate a factor of two improvement in transfer efficiency between our $^1$ S $_0$ $\rightarrow$ $^1$ P $_1$ grating MOT and our $^1$ S $_0$ $\rightarrow$ $^3$ P $_1$ grating MOT. We trap up to $3\times10^6$ $^{88}$ Sr atoms in the $^1$ S $_0$ $\rightarrow$ $^3$ P $_1$ grating MOT, at an average temperature of 4.9 $μ$ K with a lifetime of approximately 0.7 s. Our results show that SWAP is effective in non-orthogonal laser beam geometries, allowing greater duty cycles or higher atom number in sensors based on narrow-line grating MOTs.We demonstrate sawtooth wave adiabatic passage (SWAP) in a grating magneto-optical trap (MOT) operating on the $^1$S$_0$ $\rightarrow$ $^3$P$_1$ transition of neutral $^{88}$Sr. From numerical simulations of SWAP using our laser beam geometry, we find that SWAP provides greater cooling than triangle wave frequency modulation despite the complex polarization environment of a grating MOT. The simulation is confirmed by our experimental results, where we demonstrate a factor of two improvement in transfer efficiency between our $^1$S$_0$ $\rightarrow$ $^1$P$_1$ grating MOT and our $^1$S$_0$ $\rightarrow$ $^3$P$_1$ grating MOT. We trap up to $3\times10^6$ $^{88}$Sr atoms in the $^1$S$_0$ $\rightarrow$ $^3$P$_1$ grating MOT, at an average temperature of 4.9 $μ$K with a lifetime of approximately 0.7 s. Our results show that SWAP is effective in non-orthogonal laser beam geometries, allowing greater duty cycles or higher atom number in sensors based on narrow-line grating MOTs.

physics.atom-phCross-listedarXiv:2602.06230Feb 9, 20260 citations

Sub-Doppler Cooling of Neutral Atoms in a Grating Magneto-Optical Trap

Jeffrey A. Grover, J. Lee, Luis A. Orozco +1 more

Bulletin of the American Physical SocietyJun 7, 20130 citations

Phase-space description of the magneto-optical trap

Rudy Romain, Daniel Hennequin, Philippe Verkerk

arXiv:1007.5380The European Physical Journal DOct 8, 201015 citations

Sawtooth-wave adiabatic passage in a magneto-optical trap

John P. Bartolotta, Murray Holland

We investigate theoretically the application of sawtooth-wave adiabatic passage (SWAP) in a one-dimensional (1D) magneto-optical trap (MOT). As opposed to related methods that have been previously discussed, our approach utilizes repeated cycles of stimulated absorption and emission processes to achieve both trapping and cooling, thereby reducing the adverse effects that arise from photon scattering. Specifically, we demonstrate this method's ability to cool, slow, and trap particles with fewer spontaneously emitted photons, with higher forces, and in less time when compared to a traditional MOT scheme that utilizes the same narrow linewidth transition. We calculate the phase-space compression that is achievable and characterize the resulting system equilibrium cloud size and temperature.We investigate theoretically the application of sawtooth-wave adiabatic passage (SWAP) in a one-dimensional (1D) magneto-optical trap (MOT). As opposed to related methods that have been previously discussed, our approach utilizes repeated cycles of stimulated absorption and emission processes to achieve both trapping and cooling, thereby reducing the adverse effects that arise from photon scattering. Specifically, we demonstrate this method's ability to cool, slow, and trap particles with fewer spontaneously emitted photons, with higher forces, and in less time when compared to a traditional MOT scheme that utilizes the same narrow linewidth transition. We calculate the phase-space compression that is achievable and characterize the resulting system equilibrium cloud size and temperature.

arXiv:2001.07770Physical Review AMay 27, 202010 citations

We demonstrate sawtooth wave adiabatic passage (SWAP) in a grating magneto-optical trap (MOT) operating on the

^1

_0

\rightarrow

^3

_1

transition of neutral

^{88}

Sr. From numerical simulations of SWAP using our laser beam geometry, we find that SWAP provides greater cooling than triangle wave frequency modulation despite the complex polarization environment of a grating MOT. The simulation is confirmed by our experimental results, where we demonstrate a factor of two improvement in transfer efficiency between our

^1

_0

\rightarrow

^1

_1

grating MOT and our

^1

_0

\rightarrow

^3

_1

grating MOT. We trap up to

3\times10^6

^{88}

Sr atoms in the

^1

_0

\rightarrow

^3

_1

grating MOT, at an average temperature of 4.9

μ

K with a lifetime of approximately 0.7 s. Our results show that SWAP is effective in non-orthogonal laser beam geometries, allowing greater duty cycles or higher atom number in sensors based on narrow-line grating MOTs.