2024
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| 12. | Bocheński, Mateusz; Semczuk, Mariusz Sub-Doppler laser cooling and magnetic trapping of natural-abundance fermionic potassium. Journal Article Journal of Physics B: Atomic, Molecular and Optical Physics, 2024. Abstract | Links | BibTeX @article{10.1088/1361-6455/ad2181,
title = {Sub-Doppler laser cooling and magnetic trapping of natural-abundance fermionic potassium.},
author = {Mateusz Bocheński and Mariusz Semczuk},
url = {http://iopscience.iop.org/article/10.1088/1361-6455/ad2181},
year = {2024},
date = {2024-01-01},
journal = {Journal of Physics B: Atomic, Molecular and Optical Physics},
abstract = {We demonstrate the largest number of 40K atoms that has ever been cooled to deeply sub-Doppler temperatures in a single chamber apparatus without using an enriched source of potassium. With gray molasses cooling on the D1-line following a standard D2-line magneto-optical trap, we obtain 3×105 atoms at 10(2) μK. We reach densities high enough to measure the temperature via absorption imaging using the time-of-flight method. We magnetically trap a mixture of mF=-3/2,-5/2 and -7/2 Zeeman states of the F=7/2 hyperfine ground state confining 5×104 atoms with a lifetime of 0.6 s or ∼103 atoms with a lifetime of 2.8 s - depending on whether the temperature of the potassium dispensers was chosen to maximize the atom number or the lifetime. The background pressure-limited lifetime of 0.6 s is a reasonable starting point for proof-of-principle experiments with atoms and/or molecules in optical tweezers as well as for sympathetic cooling with another species if transport to a secondary chamber is implemented.
Our results show that unenriched potassium can be used to optimize experimental setups containing 40K in the initial stages of their construction, which can effectively extend the lifetime of enriched sources needed for proper experiments. Moreover, demonstration of sub-Doppler cooling and magnetic trapping of a relatively small number of potassium atoms might influence experiments with laser cooled radioactive isotopes of potassium.},
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pubstate = {published},
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We demonstrate the largest number of 40K atoms that has ever been cooled to deeply sub-Doppler temperatures in a single chamber apparatus without using an enriched source of potassium. With gray molasses cooling on the D1-line following a standard D2-line magneto-optical trap, we obtain 3×105 atoms at 10(2) μK. We reach densities high enough to measure the temperature via absorption imaging using the time-of-flight method. We magnetically trap a mixture of mF=-3/2,-5/2 and -7/2 Zeeman states of the F=7/2 hyperfine ground state confining 5×104 atoms with a lifetime of 0.6 s or ∼103 atoms with a lifetime of 2.8 s - depending on whether the temperature of the potassium dispensers was chosen to maximize the atom number or the lifetime. The background pressure-limited lifetime of 0.6 s is a reasonable starting point for proof-of-principle experiments with atoms and/or molecules in optical tweezers as well as for sympathetic cooling with another species if transport to a secondary chamber is implemented.

Our results show that unenriched potassium can be used to optimize experimental setups containing 40K in the initial stages of their construction, which can effectively extend the lifetime of enriched sources needed for proper experiments. Moreover, demonstration of sub-Doppler cooling and magnetic trapping of a relatively small number of potassium atoms might influence experiments with laser cooled radioactive isotopes of potassium. |
2023
|
| 11. | Dinçer, Koray; Semczuk, Mariusz Open-Source Magnetometer for Characterizing Magnetic Fields in Ultracold Experiments Journal Article Applied Sciences, 13 (19), 2023, ISSN: 2076-3417. Abstract | Links | BibTeX @article{app131910620,
title = {Open-Source Magnetometer for Characterizing Magnetic Fields in Ultracold Experiments},
author = {Koray Dinçer and Mariusz Semczuk},
url = {https://www.mdpi.com/2076-3417/13/19/10620},
doi = {10.3390/app131910620},
issn = {2076-3417},
year = {2023},
date = {2023-01-01},
journal = {Applied Sciences},
volume = {13},
number = {19},
abstract = {We demonstrate a fully automated open-source magnetometer designed primarily for characterization of magnetic fields produced by coils, permanent magnets or by parasitic sources. It is based on an Arduino Mega microcontroller and a three-axis Hall sensor with a measurement range of ±8 G per axis and the RMS of the field readout below 0.3 mG. For all practical purposes, the sensor displacement during data acquisition is virtually unlimited, which can be particularly useful for characterizing large or extended coils like Helmholtz cages or Zeeman slowers. All components needed for the construction are cheap and widely available off-the-shelf elements or are 3D-printed. The operation of the magnetometer is controlled via a graphical user interface (GUI), which manages all essential functionalities, like data acquisition and plotting. The GUI also incorporates additional features, like data averaging, calibration of the displacement of the Hall sensor or real-time readout of the magnetic field, useful for monitoring magnetic field changes. We have used a pair of rectangular coils constructed for a potassium–cesium 2D magneto-optical trap to benchmark the performance of the magnetometer. We have obtained good agreement with both simulations and measurements acquired with a commercial gaussmeter.},
keywords = {},
pubstate = {published},
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We demonstrate a fully automated open-source magnetometer designed primarily for characterization of magnetic fields produced by coils, permanent magnets or by parasitic sources. It is based on an Arduino Mega microcontroller and a three-axis Hall sensor with a measurement range of ±8 G per axis and the RMS of the field readout below 0.3 mG. For all practical purposes, the sensor displacement during data acquisition is virtually unlimited, which can be particularly useful for characterizing large or extended coils like Helmholtz cages or Zeeman slowers. All components needed for the construction are cheap and widely available off-the-shelf elements or are 3D-printed. The operation of the magnetometer is controlled via a graphical user interface (GUI), which manages all essential functionalities, like data acquisition and plotting. The GUI also incorporates additional features, like data averaging, calibration of the displacement of the Hall sensor or real-time readout of the magnetic field, useful for monitoring magnetic field changes. We have used a pair of rectangular coils constructed for a potassium–cesium 2D magneto-optical trap to benchmark the performance of the magnetometer. We have obtained good agreement with both simulations and measurements acquired with a commercial gaussmeter. |
2021
|
| 10. | Dobosz, Jakub; Bocheński, Mateusz; Semczuk, Mariusz Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation Journal Article Applied Sciences, 11 (21), 2021, ISSN: 2076-3417. Abstract | Links | BibTeX @article{app112110474,
title = {Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation},
author = {Jakub Dobosz and Mateusz Bocheński and Mariusz Semczuk},
url = {https://www.mdpi.com/2076-3417/11/21/10474},
doi = {10.3390/app112110474},
issn = {2076-3417},
year = {2021},
date = {2021-01-01},
journal = {Applied Sciences},
volume = {11},
number = {21},
abstract = {In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each pair is controlled by one module, and we are able to continuously change the current flowing thorough the coils in the ±4 A range using analog waveforms such that smooth crossing through zero as the current’s direction changes is possible. With the electrical current stability at the 10−5 level, the designed circuit enables state-of-the-art ultracold experiments. As a benchmark, we use the circuit to compensate stray magnetic fields that hinder efficient sub-Doppler cooling of alkali atoms in gray molasses. We demonstrate how such compensation can be achieved without actually measuring the stray fields present, thus speeding up the process of optimization of various laser cooling stages.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each pair is controlled by one module, and we are able to continuously change the current flowing thorough the coils in the ±4 A range using analog waveforms such that smooth crossing through zero as the current’s direction changes is possible. With the electrical current stability at the 10−5 level, the designed circuit enables state-of-the-art ultracold experiments. As a benchmark, we use the circuit to compensate stray magnetic fields that hinder efficient sub-Doppler cooling of alkali atoms in gray molasses. We demonstrate how such compensation can be achieved without actually measuring the stray fields present, thus speeding up the process of optimization of various laser cooling stages. |
2016
|
| 9. | Bowden, William; Gunton, Will; Semczuk, Mariusz; Dare, Kahan; Madison, Kirk W An adaptable dual species effusive source and Zeeman slower design demonstrated with Rb and Li Journal Article Review of Scientific Instruments, 87 (4), pp. 043111, 2016. Links | BibTeX @article{doi:10.1063/1.4945567,
title = {An adaptable dual species effusive source and Zeeman slower design demonstrated with Rb and Li},
author = {William Bowden and Will Gunton and Mariusz Semczuk and Kahan Dare and Kirk W Madison},
url = {http://dx.doi.org/10.1063/1.4945567},
doi = {10.1063/1.4945567},
year = {2016},
date = {2016-01-01},
journal = {Review of Scientific Instruments},
volume = {87},
number = {4},
pages = {043111},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
| 8. | Gunton, Will; Polovy, Gene; Semczuk, Mariusz; Madison, Kirk W Transparent electrodes for high E-field production using a buried indium tin oxide layer Journal Article Review of Scientific Instruments, 87 (3), pp. 033113, 2016. Links | BibTeX @article{doi:10.1063/1.4944411,
title = {Transparent electrodes for high E-field production using a buried indium tin oxide layer},
author = {Will Gunton and Gene Polovy and Mariusz Semczuk and Kirk W Madison},
url = {http://aip.scitation.org/doi/abs/10.1063/1.4944411},
doi = {10.1063/1.4944411},
year = {2016},
date = {2016-01-01},
journal = {Review of Scientific Instruments},
volume = {87},
number = {3},
pages = {033113},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2015
|
| 7. | Gunton, Will; Semczuk, Mariusz; Madison, Kirk W Method for independent and continuous tuning of N lasers phase-locked to the same frequency comb Journal Article Opt. Lett., 40 (18), pp. 4372–4375, 2015. Abstract | Links | BibTeX @article{Gunton:15,
title = {Method for independent and continuous tuning of N lasers phase-locked to the same frequency comb},
author = {Will Gunton and Mariusz Semczuk and Kirk W Madison},
url = {http://ol.osa.org/abstract.cfm?URI=ol-40-18-4372},
doi = {10.1364/OL.40.004372},
year = {2015},
date = {2015-09-01},
journal = {Opt. Lett.},
volume = {40},
number = {18},
pages = {4372--4375},
publisher = {OSA},
abstract = {We present a method of phase locking any number of continuous-wave lasers to an optical frequency comb (OFC) that enables independent frequency positioning and control of each laser while still maintaining lock to the OFC. The scheme employs an acousto-optic modulator (AOM) in a double-pass configuration added to each laser before its light is compared by optical heterodyne with the comb. The only requirement is that the tuning bandwidth of the double-pass AOM setup be larger than half the OFC repetition rate. We demonstrate this scheme and achieve an arbitrary frequency tuning precision, a tuning rate of 200 MHz/s, and a readout precision at the 1 kHz level.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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We present a method of phase locking any number of continuous-wave lasers to an optical frequency comb (OFC) that enables independent frequency positioning and control of each laser while still maintaining lock to the OFC. The scheme employs an acousto-optic modulator (AOM) in a double-pass configuration added to each laser before its light is compared by optical heterodyne with the comb. The only requirement is that the tuning bandwidth of the double-pass AOM setup be larger than half the OFC repetition rate. We demonstrate this scheme and achieve an arbitrary frequency tuning precision, a tuning rate of 200 MHz/s, and a readout precision at the 1 kHz level. |
2014
|
| 6. | Semczuk, Mariusz; Gunton, Will; Bowden, William; Madison, Kirk W Anomalous Behavior of Dark States in Quantum Gases of $^6mathrmLi$ Journal Article Phys. Rev. Lett., 113 , pp. 055302, 2014. Links | BibTeX @article{PhysRevLett.113.055302,
title = {Anomalous Behavior of Dark States in Quantum Gases of $^6mathrmLi$},
author = {Mariusz Semczuk and Will Gunton and William Bowden and Kirk W Madison},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.113.055302},
doi = {10.1103/PhysRevLett.113.055302},
year = {2014},
date = {2014-07-01},
journal = {Phys. Rev. Lett.},
volume = {113},
pages = {055302},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2013
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| 5. | Gunton, Will; Semczuk, Mariusz; Dattani, Nikesh S; Madison, Kirk W High-resolution photoassociation spectroscopy of the $^6$Li$_2$ $A(1^1ensuremathSigma_u^+)$ state Journal Article Phys. Rev. A, 88 , pp. 062510, 2013. Links | BibTeX @article{PhysRevA.88.062510,
title = {High-resolution photoassociation spectroscopy of the $^6$Li$_2$ $A(1^1ensuremathSigma_u^+)$ state},
author = {Will Gunton and Mariusz Semczuk and Nikesh S Dattani and Kirk W Madison},
url = {https://link.aps.org/doi/10.1103/PhysRevA.88.062510},
doi = {10.1103/PhysRevA.88.062510},
year = {2013},
date = {2013-12-01},
journal = {Phys. Rev. A},
volume = {88},
pages = {062510},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
| 4. | Gunton, Will; Semczuk, Mariusz; Madison, Kirk W Realization of BEC-BCS-crossover physics in a compact oven-loaded magneto-optic-trap apparatus Journal Article Phys. Rev. A, 88 , pp. 023624, 2013. Links | BibTeX @article{PhysRevA.88.023624,
title = {Realization of BEC-BCS-crossover physics in a compact oven-loaded magneto-optic-trap apparatus},
author = {Will Gunton and Mariusz Semczuk and Kirk W Madison},
url = {https://link.aps.org/doi/10.1103/PhysRevA.88.023624},
doi = {10.1103/PhysRevA.88.023624},
year = {2013},
date = {2013-08-01},
journal = {Phys. Rev. A},
volume = {88},
pages = {023624},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
| 3. | Semczuk, Mariusz; Li, Xuan; Gunton, Will; Haw, Magnus; Dattani, Nikesh S; Witz, Julien; Mills, Arthur K; Jones, David J; Madison, Kirk W High-resolution photoassociation spectroscopy of the $^6$Li$_2$ $1^3ensuremathSigma_g^+$ state Journal Article Phys. Rev. A, 87 , pp. 052505, 2013. Links | BibTeX @article{PhysRevA.87.052505,
title = {High-resolution photoassociation spectroscopy of the $^6$Li$_2$ $1^3ensuremathSigma_g^+$ state},
author = {Mariusz Semczuk and Xuan Li and Will Gunton and Magnus Haw and Nikesh S Dattani and Julien Witz and Arthur K Mills and David J Jones and Kirk W Madison},
url = {https://link.aps.org/doi/10.1103/PhysRevA.87.052505},
doi = {10.1103/PhysRevA.87.052505},
year = {2013},
date = {2013-05-01},
journal = {Phys. Rev. A},
volume = {87},
pages = {052505},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2010
|
| 2. | Deh, B; Gunton, W; Klappauf, B G; Li, Z; Semczuk, M; Dongen, Van J; Madison, K W Giant Feshbach resonances in $^6mathrmLi$-$^85mathrmRb$ mixtures Journal Article Phys. Rev. A, 82 , pp. 020701, 2010. Links | BibTeX @article{PhysRevA.82.020701,
title = {Giant Feshbach resonances in $^6mathrmLi$-$^85mathrmRb$ mixtures},
author = {B Deh and W Gunton and B G Klappauf and Z Li and M Semczuk and J Van Dongen and K W Madison},
url = {https://link.aps.org/doi/10.1103/PhysRevA.82.020701},
doi = {10.1103/PhysRevA.82.020701},
year = {2010},
date = {2010-08-01},
journal = {Phys. Rev. A},
volume = {82},
pages = {020701},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2007
|
| 1. | Stacewicz, T; Wasylczyk, P; Kowalczyk, P; Semczuk, M Cavity ring down spectroscopy experiment for an advanced undergraduate laboratory Journal Article European Journal of Physics, 28 (5), pp. 789, 2007. Links | BibTeX @article{0143-0807-28-5-002,
title = {Cavity ring down spectroscopy experiment for an advanced undergraduate laboratory},
author = {T Stacewicz and P Wasylczyk and P Kowalczyk and M Semczuk},
url = {http://stacks.iop.org/0143-0807/28/i=5/a=002},
year = {2007},
date = {2007-01-01},
journal = {European Journal of Physics},
volume = {28},
number = {5},
pages = {789},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|