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Journal of Time and Frequency

Design of magnetic field of magnetic-optical trap and control circuit for Sr optical lattice clock

Hong Chang

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

Owing to the different requirements to the magnetic field of magnetic-optical trap for the two different stages of cooling of Sr optical lattice clock,the magnetic field conversion needs to be controlled with a certain sequence within a short time for reducing the fleeing of the atoms in the magnetic field conversion.The theory of the anti-Helmholtz coil is discussed,a design of the magnetic field for the two-stage-cooling of Sr optical lattice clock is presented,and an occurring and controlling device for the magnetic conversion,which mainly contains control circuit and protection circuit,is manufactured.The measurement shows that the current through the coil is controlled by the input signal,meeting the experimental requirements.

Related papers

The Zeeman Slower Magnetic Field for ~(87)Sr Atom

Shougang Zhang

A magnetic field of the Zeeman slower is designed for 87Sr atom based on Zeeman effect and Doppler cooling theory with the experimental condition.A spindle-shaped coil is manufactured according to the simulated values of the layers,the turns,the current and other parameters.The measured result shows that the longitudinal magnetic field of the manufactured spindle-shaped coil satisfies the requirement of 87Sr optical lattice clock experiment.

Journal of Time and Frequency•Jan 1, 2008•0 citations

Miniaturization of physics system in Sr optical clock

Zhao Fang-Jing, Gao Feng, 韩建新 HAN Jian-xin +6 more

The compactness and robustness of the vacuum setup are the major limitations to develop transportable and space-borne optical clocks. The first step in the engineering challenge is to reduce volume and weight with respect to a stationary system. In this paper, we present the realization of a miniaturized vacuum system by building two anti-Helmholtz coils inside the vacuum magneto-optical-trap (MOT) chamber. The built-in coils are specially designed to minimize the distance between the coils, and in this way it is possible to reduce the current needed to realize a typical magnetic gradient of 40 Gs/cm required for blue MOT. When the MOT coil current is 2 A, an axial magnetic field gradient of 43 Gs/cm is obtained in the center of the MOT, which is enough for the first stage Doppler cooling. This novel design allows us to reduce size, weight and power consumption with respect to a traditional laser cooling apparatus, and simultaneously avoid complicating the water cooling equipment. Our vacuum system has a size of 60 cm×20 cm×15 cm, about 1/10 of the original system in the laboratory. In addition, the circularly polarized Zeeman slowing laser is sent to counter propagating atomic beam, and atoms at a few hundred meters per second are now routinely slowed down to velocities of tens of meters per second. As a result, about 16.4% of the atoms are actually trapped into the blue MOT. The final temperature of the blue MOT is approximately 10.6 mK, and the internal diameter is 1.5 mm by observing the expansion of the atoms from the MOT. The populations of cold atoms finally trapped in the MOT are 1.6×106 of 88Sr and 1.5×105 of 87Sr. The 1S0 → 1P1 transition used for the blue MOT is not perfectly closed due to the decay channel of the 5p1P1 → 4d1D2, and a part of atoms are stored in the 3P2 and 3P0 states. To prevent the atoms from losing, 707 and 679 nm repumping lasers are employed to recycle these atoms in the 3P1 state, and then the atoms decay to the ground state 1S0. Now the typical number of loaded atoms dramatically increases by 5 times compared with before. The slowing efficiency of Zeeman slower is also optimized for the operation with deceleration related to the parameter of magnet length, which uses more effectively available magnetic field distribution, in contrast to the usual constant deceleration mode. Our future work will focus on constructing a Zeeman slower combined with permanent magnets or an electric magnet for better tuning of the magnetic field.

Acta Physica Sinica•Jan 1, 2018•4 citations

An optical lattice clock based on bosonic Sr

N. Poli, Marco G. Tarallo, M. Schioppo +2 more

We present experimental results for an optical lattice clock operating on the1S0harr3P0transition in88Sr, which is excited with the technique of magnetic field-induced spectroscopy To reduce the complexity of the setup we have developed a set of new experimental techniques that greatly simplifies the clock spectroscopy in Sr atoms. First, we developed a method for finding the clock transition that removes the need for extensive frequency metrology hardware and optical frequency combs. This technique exploits a near coincidence in the atomic wavelengths of the1S0harr3P0clock and1S0harr3P1second stage cooling transitions in Sr, which are only 5 THz far apart. This coincidence enables the use of an optical (transfer) cavity to reference the frequency of the clock transition relative to that of the much stronger coolign transition Second, all laser sources in the experimental setup are based on semiconductor technology, which greatly reduces the complexity of the apparatus. With this setup, about 10488Sr atoms are trapped in a 1D lattice formed by 200 mW of radiation tuned near the magic wavelength at 813 nm. Preliminar uncertainty budget for our optical lattice clock is also presented, with particular attention to density dependent collisions, which led to an unexpectedly high signal contrast for long interaction times.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•Apr 1, 2009•0 citations

Toward the use of an additional degree of freedom of the Zeeman slower frequency tuning

Mikhail Gurov, Elena G. Gurova, Nikolay V. Pustovoy

In this paper the simplifying possibility of the scheme of the optical lattice clocks using a single source of the slowing laser radiation for the two installations of the 87 Sr isotope optical clocks is considered. We designed the scheme where the correction of the constant component of the partial frequency-detuning magnetic field for the each Zeeman slower is achieved. Calculations of the resonance curve of the longitudinal magnetic field of the slower field are given with the introduction of the additional magnetic component into the calculation for the additional detuning and, at the same time, the frequency detuning of the magnetic field profile by an additional coil. The field of the additional coil, which is included into Zeeman slower, does not change the resonance profile of the magnetic field. The possibility of detuning within the width of the cooling transition is shown.

Journal of Physics Conference Series•Oct 1, 2021•0 citations

Optical lattice clock on bosonic Strontium atoms

N. Poli, Marco G. Tarallo, M. Schioppo +4 more

We report on recent realization of an optical lattice clock operating on the1S0-3P0transition in88Sr, at LENS laboratories. The clock transition is excited with the technique of magnetic field-induced spectroscopy. New experimental techniques has also been developed in order to simplifies the clock spectroscopy in Sr atoms. The first new method helps in the first search of the clock transition without the use of extensive frequency metrology hardware and in particular optical frequency combs. This technique exploits a near coincidence in the atomic wavelengths of the1S0-3P0clock and1S0-3P1second stage cooling transitions in Sr, which are only 5 THz far apart. This coincidence enables the use of an optical (transfer) cavity to reference the frequency of the clock transition relative to that of the much stronger cooling transition. Secondly we reduce the complexity of the experimental setup by using only semiconductor laser sources in the apparatus. With this setup, about 10488Sr atoms are trapped in a 1D lattice formed by 200 mW of radiation tuned near the magic wavelength at 813 nm. We will present a first uncertainty budget for our optical lattice clock based on88Sr with particular attention to density dependent collisions, which led to an unexpectedly high signal contrast for long interaction times. In view of an absolute frequency measurement of clock transition we'll also present recent experimental results on optimization of an home made Ti:Sa optical frequency comb. Additionally, we anticipate that the simplification of the experimental setup presented will help address a wider range of applications including those requiring transportable devices. Along these lines we will report progress on the realization of the first transportable Sr optical lattice clock.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2009•1 citation

Evaluation of the Dynamic Magnetic Field Induced Effects on the Lattice Loading Efficiency of a Spaceborne Sr Optical Lattice Clock

Jiajun Jing, Yong Shen, Xiaokang Tang +5 more

Abstract We evaluate the effects of the dynamic magnetic field on the lattice-loading efficiency of a spaceborne Sr optical lattice clock. The orbital magnetic field is calculated using the International Geomagnetic Reference Field-14 model and calibrated with in situ MAG-13 magnetometer data to include quasi-static stray fields from onboard electrical equipment. An ensemble Monte Carlo simulation is then employed to systematically investigate the dependencies of the final ensemble-averaged atomic temperature and the optical lattice loading efficiency on the laser saturation parameter $s$ and detuning $\delta$. Feedforward Helmholtz coil compensation based on the IGRF-14 calibrated field prediction restores the time-averaged efficiency from $\bar{\eta} = 5.67\%$ in the uncompensated case to $\bar{\eta} = 13.05\%$. These results quantify the influence of dynamic magnetic fields on lattice loading and provide guidance for magnetic-field compensation in future spaceborne Sr optical lattice clock missions.

Chinese Physics B•Aug 25, 2026•0 citations
Owing to the different requirements to the magnetic field of magnetic-optical trap for the two different stages of cooling of Sr optical lattice clock,the magnetic field conversion needs to be controlled with a certain sequence within a short time for reducing the fleeing of the atoms in the magnetic field conversion.The theory of the anti-Helmholtz coil is discussed,a design of the magnetic field for the two-stage-cooling of Sr optical lattice clock is presented,and an occurring and controlling device for the magnetic conversion,which mainly contains control circuit and protection circuit,is manufactured.The measurement shows that the current through the coil is controlled by the input signal,meeting the experimental requirements.
The compactness and robustness of the vacuum setup are the major limitations to develop transportable and space-borne optical clocks. The first step in the engineering challenge is to reduce volume and weight with respect to a stationary system. In this paper, we present the realization of a miniaturized vacuum system by building two anti-Helmholtz coils inside the vacuum magneto-optical-trap (MOT) chamber. The built-in coils are specially designed to minimize the distance between the coils, and in this way it is possible to reduce the current needed to realize a typical magnetic gradient of 40 Gs/cm required for blue MOT. When the MOT coil current is 2 A, an axial magnetic field gradient of 43 Gs/cm is obtained in the center of the MOT, which is enough for the first stage Doppler cooling. This novel design allows us to reduce size, weight and power consumption with respect to a traditional laser cooling apparatus, and simultaneously avoid complicating the water cooling equipment. Our vacuum system has a size of 60 cm×20 cm×15 cm, about 1/10 of the original system in the laboratory. In addition, the circularly polarized Zeeman slowing laser is sent to counter propagating atomic beam, and atoms at a few hundred meters per second are now routinely slowed down to velocities of tens of meters per second. As a result, about 16.4% of the atoms are actually trapped into the blue MOT. The final temperature of the blue MOT is approximately 10.6 mK, and the internal diameter is 1.5 mm by observing the expansion of the atoms from the MOT. The populations of cold atoms finally trapped in the MOT are 1.6×106 of 88Sr and 1.5×105 of 87Sr. The 1S0 → 1P1 transition used for the blue MOT is not perfectly closed due to the decay channel of the 5p1P1 → 4d1D2, and a part of atoms are stored in the 3P2 and 3P0 states. To prevent the atoms from losing, 707 and 679 nm repumping lasers are employed to recycle these atoms in the 3P1 state, and then the atoms decay to the ground state 1S0. Now the typical number of loaded atoms dramatically increases by 5 times compared with before. The slowing efficiency of Zeeman slower is also optimized for the operation with deceleration related to the parameter of magnet length, which uses more effectively available magnetic field distribution, in contrast to the usual constant deceleration mode. Our future work will focus on constructing a Zeeman slower combined with permanent magnets or an electric magnet for better tuning of the magnetic field.
We present experimental results for an optical lattice clock operating on the1S0harr3P0transition in88Sr, which is excited with the technique of magnetic field-induced spectroscopy To reduce the complexity of the setup we have developed a set of new experimental techniques that greatly simplifies the clock spectroscopy in Sr atoms. First, we developed a method for finding the clock transition that removes the need for extensive frequency metrology hardware and optical frequency combs. This technique exploits a near coincidence in the atomic wavelengths of the1S0harr3P0clock and1S0harr3P1second stage cooling transitions in Sr, which are only 5 THz far apart. This coincidence enables the use of an optical (transfer) cavity to reference the frequency of the clock transition relative to that of the much stronger coolign transition Second, all laser sources in the experimental setup are based on semiconductor technology, which greatly reduces the complexity of the apparatus. With this setup, about 10488Sr atoms are trapped in a 1D lattice formed by 200 mW of radiation tuned near the magic wavelength at 813 nm. Preliminar uncertainty budget for our optical lattice clock is also presented, with particular attention to density dependent collisions, which led to an unexpectedly high signal contrast for long interaction times.
In this paper the simplifying possibility of the scheme of the optical lattice clocks using a single source of the slowing laser radiation for the two installations of the 87 Sr isotope optical clocks is considered. We designed the scheme where the correction of the constant component of the partial frequency-detuning magnetic field for the each Zeeman slower is achieved. Calculations of the resonance curve of the longitudinal magnetic field of the slower field are given with the introduction of the additional magnetic component into the calculation for the additional detuning and, at the same time, the frequency detuning of the magnetic field profile by an additional coil. The field of the additional coil, which is included into Zeeman slower, does not change the resonance profile of the magnetic field. The possibility of detuning within the width of the cooling transition is shown.
We report on recent realization of an optical lattice clock operating on the1S0-3P0transition in88Sr, at LENS laboratories. The clock transition is excited with the technique of magnetic field-induced spectroscopy. New experimental techniques has also been developed in order to simplifies the clock spectroscopy in Sr atoms. The first new method helps in the first search of the clock transition without the use of extensive frequency metrology hardware and in particular optical frequency combs. This technique exploits a near coincidence in the atomic wavelengths of the1S0-3P0clock and1S0-3P1second stage cooling transitions in Sr, which are only 5 THz far apart. This coincidence enables the use of an optical (transfer) cavity to reference the frequency of the clock transition relative to that of the much stronger cooling transition. Secondly we reduce the complexity of the experimental setup by using only semiconductor laser sources in the apparatus. With this setup, about 10488Sr atoms are trapped in a 1D lattice formed by 200 mW of radiation tuned near the magic wavelength at 813 nm. We will present a first uncertainty budget for our optical lattice clock based on88Sr with particular attention to density dependent collisions, which led to an unexpectedly high signal contrast for long interaction times. In view of an absolute frequency measurement of clock transition we'll also present recent experimental results on optimization of an home made Ti:Sa optical frequency comb. Additionally, we anticipate that the simplification of the experimental setup presented will help address a wider range of applications including those requiring transportable devices. Along these lines we will report progress on the realization of the first transportable Sr optical lattice clock.
Abstract We evaluate the effects of the dynamic magnetic field on the lattice-loading efficiency of a spaceborne Sr optical lattice clock. The orbital magnetic field is calculated using the International Geomagnetic Reference Field-14 model and calibrated with in situ MAG-13 magnetometer data to include quasi-static stray fields from onboard electrical equipment. An ensemble Monte Carlo simulation is then employed to systematically investigate the dependencies of the final ensemble-averaged atomic temperature and the optical lattice loading efficiency on the laser saturation parameter sss and detuning δ\deltaδ. Feedforward Helmholtz coil compensation based on the IGRF-14 calibrated field prediction restores the time-averaged efficiency from ηˉ=5.67%\bar{\eta} = 5.67\%ηˉ​=5.67% in the uncompensated case to ηˉ=13.05%\bar{\eta} = 13.05\%ηˉ​=13.05%. These results quantify the influence of dynamic magnetic fields on lattice loading and provide guidance for magnetic-field compensation in future spaceborne Sr optical lattice clock missions.