CN116230287A - Laser system and method for rubidium atom double-color magneto-optical trap - Google Patents
Laser system and method for rubidium atom double-color magneto-optical trap Download PDFInfo
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Abstract
The invention relates to a laser system for a rubidium atom bicolor magneto-optical trap and a method thereof, wherein the laser system comprises the following steps: a laser module comprising a master laser and a slave laser; the frequency locking modulation module is used for receiving main laser of the main laser, carrying out light splitting and modulation treatment, obtaining a feedback signal after one path of main laser passes through the laser frequency locking module, and locking the output main laser frequency to a rubidium atom specific transition spectral line by the main laser according to the feedback signal; the other main laser provides resonance detection light for the double-color magneto-optical trap and provides frequency quasi light for optical beat frequency locking through re-splitting and modulation; the beat frequency modulation module receives the slave laser of the slave laser, performs light splitting and modulation treatment, forms optical beat frequency with the frequency quasi-light beam of one path of slave laser, and realizes beat frequency locking with the master laser; the other path of laser reaches the electro-optical modulator, and the output laser is modulated to generate carrier waves and sidebands so as to provide cooling light and re-pumping light for the bicolor magneto-optical trap. The invention can reduce the cost and improve the compactness of the system.
Description
Technical Field
The invention relates to the technical field of cold atom technology and laser, in particular to a laser system and a method for a rubidium atom bicolor magneto-optical trap.
Background
Magneto-optical trapping (MOT) is an effective means of cooling and trapping atoms. Classical MOT consists of a gradient magnetic field generated by an anti-helmholtz coil and three sets of mutually perpendicular, opposite laser light with a specific polarization configuration. The most common at present is the red-detuned MOT (cooling light frequency is negative detuned, i.e.. ω laser -ω atom <0，ω laser For angular frequency, ω of the laser atom Corresponding angular frequency to the atomic transition spectral line to be locked), the total angular momentum quantum number of the atomic transition of which satisfies F'>F (F' and F correspond to the total angular momentum quantum number of atomic transition in the excited state and the ground state, respectively). The laser configuration required by the red detuned MOT is simple and widely applied, but in a magnetic field zero point region with lower atomic temperature, the heating effect of the laser on atoms is dominant, so that the cooling effect of the mode is limited, and the density of the prepared atomic groups is lower; while blue detuned MOT (cooling light frequency is positive detuned, i.e.. ω laser -ω atom >0,F' +.F) can achieve higher phase space densities, but the effective area for cooling and trapping atoms is smaller, resulting in lower atom loading efficiency. To sum up, in order to realize efficient and high-phase space density atomic group preparation, a staged two-color magneto-optical trap scheme is proposed. The scheme firstly utilizes the red detuned MOT to carry out quick loading and pre-cooling on atoms, and then switches to the blue detuned MOT to further cool the atoms and improve the phase space density of the atoms.
In the prior art, a laser system for implementing a bicolor magneto-optical trap scheme is complex, and needs to generate cooling light, re-pumping light, de-pumping light, detection light and the like needed by red and blue detuned MOTs. In addition, a plurality of lasers and a plurality of conical amplifiers are needed to be realized together, so that the existing laser system for realizing the dual-color magneto-optical trap is complex, has a large number of devices, is high in cost and large in structural size, and is not beneficial to engineering application.
Disclosure of Invention
The technical problems to be solved are as follows:
the invention aims to solve the problems and provides a laser system and a method for a rubidium atom bicolor magneto-optical trap. The laser system comprises 2 lasers and 1 conical amplifier, and the requirements of different stages on laser frequency are met by changing the reference frequency of a beat frequency locking loop and the driving frequency of an electro-optic modulator EOM; and the power ratio of the f=2 laser and the f=1 laser is controlled by adjusting the electro-optic modulator EOM driving power. Through optimizing the system design, the laser frequency and power requirements of the red and blue detuned MOT are met, the number of devices is reduced, the cost is reduced, and the system compactness is improved.
The technical scheme adopted is as follows:
a laser system for a rubidium atom bicolor magneto-optical trap, comprising:
the laser module comprises a master laser and a slave laser and is used for generating master laser and slave laser to be modulated;
the frequency locking modulation module receives the main laser emitted by the main laser, performs light splitting and modulation treatment, obtains a feedback signal after one path of main laser passes through the laser frequency locking module, and locks the output main laser frequency to a rubidium atom specific transition spectral line according to the feedback signal; the other main laser provides resonance detection light for the bicolor magneto-optical trap and provides frequency quasi light for optical beat frequency locking through further light splitting and modulation;
the beat frequency modulation module receives the slave laser emitted by the slave laser, performs light splitting and modulation treatment, forms optical beat frequency with the frequency quasi-light beam, and realizes beat frequency locking between the slave laser and the master laser based on treatment of beat frequency optical signals; the other path of laser reaches the electro-optical modulator, the electro-optical modulator carries out phase modulation on the input laser, and the output laser generates carrier waves and sidebands to provide cooling light and re-pumping light for the bicolor magneto-optical trap.
Further, the frequency locking modulation module further comprises a first half-wave plate, a first polarization beam splitting prism and a first acousto-optic modulator, wherein main laser output by the main laser passes through the first half-wave plate and then reaches the first polarization beam splitting prism, and the first polarization beam splitting prism divides input laser into first transmission laser and first reflection laser; the first reflected laser enters a first acousto-optic modulator, the +1-level output laser of the first acousto-optic modulator passes through a laser frequency locking module to obtain a feedback signal, and then the main laser locks the frequency of the output laser to a rubidium atom specific transition spectral line according to the feedback signal.
Further, the frequency locking modulation module further comprises a second polarization splitting prism, a second acoustic optical modulator, a first optical fiber coupler and an optical fiber beam combiner; the first transmitted laser reaches a second polarization splitting prism, the second polarization splitting prism divides the input first transmitted laser into second transmitted laser and second reflected laser, the second transmitted laser enters a second acoustic optical modulator, and laser output by +1 level of the second acoustic optical modulator provides resonance detection light for a double-color magneto-optical trap; the second reflected laser enters the optical fiber beam combiner after passing through the first optical fiber coupler, and provides frequency quasi light for optical beat frequency locking.
Further, the modulation frequencies of the first acoustic optical modulator and the second acoustic optical modulator are the same.
Further, the beat frequency modulation module further comprises a second half wave plate, a third polarization beam splitter prism, a second optical fiber coupler, a high-speed photoelectric detector, a signal generator, a frequency and phase discriminator and a PID feedback module; the secondary laser output from the laser passes through the second half-wave plate and then reaches a third polarization splitting prism, and the third polarization splitting prism divides the input laser into third transmission laser and third reflection laser; the third reflected laser enters the optical fiber combiner after passing through the second optical fiber coupler, and forms optical beat frequency light with the frequency quasi-optical combiner; the beat frequency optical signal is subjected to photoelectric signal conversion after passing through a high-speed photoelectric detector, and then an output signal of the high-speed photoelectric detector and a reference signal provided by a signal generator enter a frequency phase discriminator together; the error signal output by the phase frequency detector passes through the PID feedback module to generate a feedback signal, and the slave laser realizes beat frequency locking with the master laser according to the feedback signal.
Further, the beat frequency modulation module further comprises; a conical amplifier, a microwave frequency source and a third acousto-optic modulator; the third transmission laser reaches an electro-optical modulator, the electro-optical modulator is driven by a microwave signal of a microwave frequency source, the electro-optical modulator carries out phase modulation on input laser, the output of the electro-optical modulator generates a carrier wave and sidebands, and the frequency difference between the carrier wave and the +1-order sidebands is determined by the driving frequency of the microwave frequency source; the laser output by the electro-optical modulator enters the conical amplifier for amplification and finally passes through the third acousto-optic modulator to provide cooling light and re-pumping light for the bicolor magneto-optical trap.
A method for a bicolor magneto-optical trap of rubidium atoms, utilizing the laser system, the laser needed by the bicolor magneto-optical trap is provided by a carrier wave and a +1-order sideband generated by a laser through an electro-optical modulator, wherein the carrier wave provides F=2 laser, and the +1-order sideband provides F=1 laser; the frequency of the f=2 laser can be changed by adjusting the reference frequency of the beat frequency locked loop; the frequency difference between the +1st order sidebands and the carrier wave can be changed by adjusting the driving frequency of the electro-optic modulator, thereby changing the frequency of the f=1 laser.
Further, the reference signal generated by the signal generator and the beat frequency signal are input into the phase frequency detector together, and when the frequency difference between the two input signals is large, the phase frequency detector works with a phase frequency detection function; when the frequencies of the two input signals are the same, the phase frequency detector works as a phase detection function, and an error signal is generated according to the phase lead or lag relation of the two input signals.
Further, during the red detuned MOT phase, the cooling light frequency is locked to 87 The Rb transition line F=2→F' =3 negative detune, the frequency of the re-pumping light is locked at 87 At the Rb transition line f=1→f' =2 negative detuning, in the red detuning MOT phase, the f=2 laser corresponds to cooling light and the f=1 laser corresponds to re-pumping light.
Further, in the blue detuned MOT phase, the f=2 laser frequency needs to be locked in 87 At the positive detuning of the Rb transition line f=2→f' =2, the f=1 laser frequency needs to be locked in 87 At the positive detuning of the Rb transition line f=1→f' =1, in the blue detuning MOT phase, both f=2 and f=1 lasers are cooling light.
The invention has the beneficial effects that:
1. the laser system of the rubidium atom double-color magneto-optical trap is simple in realized light path, easy to construct, wide in application range and beneficial to engineering application, and can provide Raman laser for an atomic interferometer.
2. The laser system provided by the invention meets the requirements of red and blue detuned MOT on laser frequency and power through optimizing the system design, reduces the number of devices, saves the cost and improves the compactness of the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a compact laser system for a rubidium atom bicolor magneto-optical trap;
FIG. 2 is rubidium 87 Hyperfine energy level of atomic D2 line and laser frequency configuration schematic diagram;
FIG. 3 is a timing diagram of the laser system operation;
the reference numerals are explained as follows:
the laser comprises a main laser, a 2-first half-wave plate, a 3-first polarization beam splitter prism, a 4-first acousto-optic modulator, a 5-laser frequency locking module, a 6-second polarization beam splitter prism, a 7-second acousto-optic modulator, an 8-first optical fiber coupler, a 9-optical fiber combiner, a 10-second optical fiber coupler, an 11-high-speed photoelectric detector, a 12-frequency discrimination phase detector, a 13-signal generator, a 14-PID feedback module, a 15-slave laser, a 16-second half-wave plate, a 17-third polarization beam splitter prism, an 18-microwave frequency source, a 19-electro-optic modulator, a 20-cone amplifier and a 21-third acousto-optic modulator; cooling light of 22-red detuned MOT, re-pumping light of 23-red detuned MOT, 24-resonance detection light, f=2 laser of 25-blue detuned MOT, f=1 laser of 26-blue detuned MOT.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
A laser system for a rubidium atom bicolor magneto-optical trap comprises a main laser 1, a first half-wave plate 2, a first polarization beam splitting prism 3, a first acousto-optic modulator 4, a laser frequency locking module 5, a second polarization beam splitting prism 6, a second acousto-optic modulator 7, a first optical fiber coupler 8, an optical fiber beam combiner 9, a second optical fiber coupler 10, a high-speed photoelectric detector 11, a frequency discrimination phase detector 12, a signal generator 13, a PID feedback module 14, a slave laser 15, a second half-wave plate 16, a third polarization beam splitting prism 17, a microwave frequency source 18, an electro-optic modulator 19, a conical amplifier 20 and a third acousto-optic modulator 21.
The output laser light of the main laser 1 passes through the first half wave plate 2 and then reaches the first polarization splitting prism 3, and the first polarization splitting prism 3 splits the input laser light into first transmission laser light and first reflection laser light. The first reflected laser enters the first acousto-optic modulator 4, the +1 level output laser (taking positive shift frequency 80MHz as an example) of the first acousto-optic modulator 4 passes through the laser frequency locking module 5 to obtain a feedback signal, and then the main laser 1 locks the frequency to a rubidium atom specific transition spectral line (F=2- & gtF' =3) according to the feedback signal; and the first transmitted laser light passing through the first polarization splitting prism 3 reaches the second polarization splitting prism 6. The second polarization splitting prism 6 splits the input laser into a second transmitted laser and a second reflected laser, wherein the second transmitted laser enters the second acoustic optical modulator 7, and the +1-level output laser (forward shift frequency 80 MHz) of the second acoustic optical modulator 7 provides resonance detection light (f=2→f' =3) for the two-color magneto-optical trap; the second reflected laser beam split by the second polarization splitting prism 6 enters the optical fiber combiner 9 after passing through the first optical fiber coupler 8, and provides frequency quasi light for optical beat frequency locking.
The output laser light from the laser 15 passes through the second half-wave plate 16 and then reaches the third polarization splitting prism 17, and the third polarization splitting prism 17 splits the input laser light into third transmission laser light and third reflection laser light. The third reflected laser enters the optical fiber combiner 9 after passing through the second optical fiber coupler 10, and forms optical beat frequency with the frequency quasi-optical combination. The beat frequency optical signal is subjected to photoelectric signal conversion by the high-speed photoelectric detector 11, and then the output signal of the high-speed photoelectric detector 11 and the reference signal provided by the signal generator 13 enter the phase frequency detector 12 together. The error signal output by the phase frequency detector 12 passes through the PID feedback module 14 to generate a feedback signal, and the slave laser 15 realizes beat frequency locking with the master laser 1 according to the feedback signal; the third transmitted laser beam split by the third polarization splitting prism 17 reaches the electro-optical modulator 19, the electro-optical modulator 19 provides a driving signal by the microwave frequency source 18, the output laser beam of the electro-optical modulator 19 is modulated to generate a carrier wave and a sideband, and the frequency difference between the carrier wave and the +1-order sideband is determined by the driving frequency of the microwave frequency source 18. The output laser of the electro-optical modulator 19 enters a conical amplifier 20 for amplification and finally passes through a third acousto-optic modulator 21 to provide cooling light and re-pumping light for the bicolor magneto-optical trap.
The system comprises a main laser, a first half-wave plate, a second polarization beam splitter prism, a first optical fiber coupler, an optical fiber beam combiner, a second optical fiber coupler, a high-speed photoelectric detector, a phase frequency detector, a signal generator, a PID feedback module, a secondary laser, a second half-wave plate and a third polarization beam splitter prism, wherein a beat frequency locking loop is formed, and beat frequency locking between the secondary laser and the main laser is realized through the beat frequency locking loop; therefore, the reference signal generated by the signal generator is the reference signal of the beat lock loop.
The specific working process of the laser system, namely the method for the rubidium atom bicolor magneto-optical trap, comprises the following steps:
with the compact laser system for the rubidium atom bicolor magneto-optical trap, the frequency of the main laser output through the main laser is f 1 The modulation frequencies of the first acoustic optical modulator and the second acoustic optical modulator are the same and are f A (80 MHz for example). The main laser is shifted after passing through the first acousto-optic modulator, the +1-order diffraction light is locked on a rubidium atom specific transition line F=2- & gt F '=3 after passing through the laser frequency locking module, and the main laser is locked at the transition line F=2- & gt F' =3 negative detuning 80MHz frequency; after the main laser after frequency stabilization passes through the second acoustic optical modulatorA frequency shift, the +1-order diffraction light provides resonance detection light with frequency f detect Can be expressed as:
f detect ＝f 1 +f A ＝ω 2→3 / (2π) (1)
wherein omega 2→3 The angular frequency corresponding to the transition line f=2→f' =3 is shown.
The frequency of the output slave laser is f 2 After passing through the second half wave plate and the third polarization beam splitter prism, the secondary laser and the main laser perform optical beat frequency in the optical fiber beam combiner, and photoelectric signal conversion is realized through the high-speed photoelectric detector, and the frequency of the beat frequency signal is recorded as f beat This can be expressed as:
f beat ＝f 1 -f 2 (2)
frequency f of reference signal generated by signal generator ref With frequency f of beat signal beat The two input signals are input into the phase frequency detector together, and when the frequency difference of the two input signals is large, the phase frequency detector works with a frequency discrimination function; when the frequencies of the two input signals are the same, the phase frequency detector works as a phase detection function, and an error signal is generated according to the phase lead or lag relation of the two input signals. The error signal output by the phase frequency detector is fed back to the slave laser through the analog PID circuit, so that the feedback control of the slave laser is realized. Therefore, the frequency difference of the master-slave laser is reflected in the frequency f of the beat signal beat In f beat Will pass through a feedback loop to the frequency f of the reference signal ref Maintaining synchronization, in the locked state:
f beat ＝f ref (3)
so that the slave laser reaches offset frequency locking relative to the master laser by changing the frequency f of the reference signal ref The frequency of the slave laser may be adjusted.
In addition, the output of the laser generates carrier wave and sideband from the laser light after passing through an electro-optical modulator, and the electro-optical modulator generates a microwave signal (the frequency of the microwave signal is denoted as f drive ) The drive, wherein the carrier is responsible for providing the f=2 laser and the +1 order sidebands are responsible for providing the f=1 laser. In the red detuned MOT orderSegment, carrier frequency f carrier And +1 order sideband frequency f band The method meets the following conditions:
f carrier ＝f 2 ＝f 1 -f ref ＝(ω 2→3 -|Δ 23 |) / (2π)-f B (4)
f band ＝f carrier +f drive ＝ ω 1→2 / (2π)-f B (5)
wherein, |delta 23 I is the absolute value of the cooling light mismatch quantity, f B Is the driving frequency of the third acousto-optic modulator. While in the blue detuned MOT phase, the carrier frequency f' carrier And +1 order sideband frequency f' band The following should be satisfied:
f ' carrier ＝f 2 ＝ f 1 -f ' ref ＝(ω 2→2 +Δ 22 ) / (2π)-f B (6)
f ' band ＝f ' carrier +f ' drive ＝(ω 1→1 +Δ 11 ) / (2π)-f B (7)
wherein delta is 22 And delta 11 The detuning amounts of the f=2 and f=1 lasers, respectively.
In summary, the laser system is configured to adjust the frequency f of the reference signal generated by the signal generator in the beat lock loop ref The frequency of the f=2 laser can be changed; by adjusting the driving frequency f of the electro-optic modulator drive The frequency difference between the +1st order sidebands and the carrier can be changed to change the frequency of the f=1 laser. In the red detuned MOT stage, the cooling light frequency is locked at 87 The Rb transition line F=2→F' =3 negative detune, the frequency of the re-pumping light is locked at 87 Rb transition line f=1→f' =2 negative detuning. In the blue detuned MOT phase, the f=2 laser frequency needs to be locked in 87 At the positive detuning of the Rb transition line f=2→f' =2, the f=1 laser frequency needs to be locked in 87 Rb transition line f=1→f' =1 positive detuning. At this time, the f=2 laser light and the f=1 laser light are both cooling light, and therefore the f=2 laser light and the f=1 laser light are described without specific description of the cooling light and the re-pumping light.
In addition, the power ratio of the f=2 laser to the f=1 laser can be controlled by adjusting the driving power of the electro-optical modulator, the power ratio of the cooling light to the re-pumping light in the red detuning MOT stage is about 10:1, and the power ratio of the f=2 laser to the f=1 laser in the blue detuning MOT stage is about 1:1.
Finally, the frequency of the signal generator is set to be far detuned (hundreds of megaHz) from the laser frequency, the driving frequency of the electro-optical modulator is set to be the ground state hyperfine energy level splitting frequency, and the carrier wave and the primary side band output from the laser can be used as a Raman beam to realize atomic coherent beam splitting, reflecting and beam combining operation in the atomic interferometer.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A laser system for a rubidium atom bicolor magneto-optical trap, comprising:
the laser module comprises a master laser and a slave laser and is used for generating master laser and slave laser to be modulated;
the frequency locking modulation module receives the main laser emitted by the main laser, performs light splitting and modulation treatment, obtains a feedback signal after one path of main laser passes through the laser frequency locking module, and locks the output main laser frequency to a rubidium atom specific transition spectral line according to the feedback signal; the other main laser provides resonance detection light for the bicolor magneto-optical trap and provides frequency quasi light for optical beat frequency locking through further light splitting and modulation;
the beat frequency modulation module receives the slave laser emitted by the slave laser, performs light splitting and modulation treatment, forms optical beat frequency with the frequency quasi-light beam, and realizes beat frequency locking between the slave laser and the master laser based on treatment of beat frequency optical signals; the other path of laser reaches the electro-optical modulator, the electro-optical modulator carries out phase modulation on the input laser, and the output laser generates carrier waves and sidebands to provide cooling light and re-pumping light for the bicolor magneto-optical trap.
2. The laser system for rubidium atom bicolor magneto-optical trap according to claim 1, wherein the frequency locking modulation module further comprises a first half-wave plate, a first polarization splitting prism and a first acousto-optic modulator, wherein the main laser output by the main laser passes through the first half-wave plate and then reaches the first polarization splitting prism, and the first polarization splitting prism divides the input laser into a first transmission laser and a first reflection laser; the first reflected laser enters a first acousto-optic modulator, the +1-level output laser of the first acousto-optic modulator passes through a laser frequency locking module to obtain a feedback signal, and then the main laser locks the frequency of the output laser to a rubidium atom specific transition spectral line according to the feedback signal.
3. The laser system for a rubidium atom bicolor magneto-optical trap of claim 2, wherein the frequency locking modulation module further comprises a second polarization splitting prism, a second acoustic optical modulator, a first optical fiber coupler and an optical fiber combiner; the first transmitted laser reaches a second polarization splitting prism, the second polarization splitting prism divides the input first transmitted laser into second transmitted laser and second reflected laser, the second transmitted laser enters a second acoustic optical modulator, and laser output by +1 level of the second acoustic optical modulator provides resonance detection light for a double-color magneto-optical trap; the second reflected laser enters the optical fiber beam combiner after passing through the first optical fiber coupler, and provides frequency quasi light for optical beat frequency locking.
4. A laser system for a rubidium atom dichroic magneto-optical trap according to claim 3, wherein the modulation frequency of the first acousto-optic modulator is the same as the modulation frequency of the second acousto-optic modulator.
5. The laser system for the rubidium atom bicolor magneto-optical trap according to claim 4, wherein the beat frequency modulation module further comprises a second half wave plate, a third polarization splitting prism, a second optical fiber coupler, a high-speed photoelectric detector, a signal generator, a phase frequency discriminator and a PID feedback module; the secondary laser output from the laser passes through the second half-wave plate and then reaches a third polarization splitting prism, and the third polarization splitting prism divides the input laser into third transmission laser and third reflection laser; the third reflected laser enters the optical fiber combiner after passing through the second optical fiber coupler, and forms optical beat frequency light with the frequency quasi-optical combiner; the beat frequency optical signal is subjected to photoelectric signal conversion after passing through a high-speed photoelectric detector, and then an output signal of the high-speed photoelectric detector and a reference signal provided by a signal generator enter a frequency phase discriminator together; the error signal output by the phase frequency detector passes through the PID feedback module to generate a feedback signal, and the slave laser realizes beat frequency locking with the master laser according to the feedback signal.
6. The laser system for a rubidium atom bicolor magneto-optical trap of claim 5, wherein said beat frequency modulation module further comprises an electro-optic modulator, a conical amplifier, a microwave frequency source, a third acousto-optic modulator; the third transmission laser reaches an electro-optical modulator, the electro-optical modulator is driven by a microwave signal of a microwave frequency source, the electro-optical modulator carries out phase modulation on input laser, output laser of the electro-optical modulator generates a carrier wave and sidebands, and the frequency difference between the carrier wave and the +1-order sidebands is determined by the driving frequency of the microwave frequency source; the laser output by the electro-optical modulator enters the conical amplifier for amplification and finally passes through the third acousto-optic modulator to provide cooling light and re-pumping light for the bicolor magneto-optical trap.
7. A method for a rubidium atom bicolor magneto-optical trap, utilizing a laser system for a rubidium atom bicolor magneto-optical trap as claimed in any one of claims 1-6, wherein the laser light required for the bicolor magneto-optical trap is provided by a carrier wave generated from the laser via an electro-optic modulator and a +1st order sideband, the carrier wave providing f=2 laser light, the +1st order sideband providing f=1 laser light; the frequency of the f=2 laser can be changed by adjusting the frequency of the reference signal generated by the signal generator; the frequency difference between the +1st order sidebands and the carrier wave can be changed by adjusting the driving frequency of the electro-optic modulator, thereby changing the frequency of the f=1 laser.
8. The method for a two-color magneto-optical trap of rubidium atoms according to claim 7, wherein the reference signal generated by the signal generator and the beat signal are input together into the phase frequency detector, and when the frequency difference between the two input signals is large, the phase frequency detector operates with the phase frequency detector; when the frequencies of the two input signals are the same, the phase frequency detector works as a phase detection function, and an error signal is generated according to the phase lead or lag relation of the two input signals.
9. The method of claim 8, wherein the cooling light frequency is locked in a red-detuned MOT phase 87 The Rb transition line F=2→F' =3 negative detune, the frequency of the re-pumping light is locked at 87 At the Rb transition line f=1→f' =2 negative detuning, in the red detuning MOT phase, the f=2 laser corresponds to cooling light and the f=1 laser corresponds to re-pumping light.
10. A method for a bi-color magneto-optical trap of rubidium atoms according to claim 8 or 9, wherein during the blue detuned MOT phase, the f=2 laser frequency is locked to 87 At the positive detuning of the Rb transition line f=2→f' =2, the f=1 laser frequency needs to be locked in 87 At the positive detuning of the Rb transition line f=1→f' =1, in the blue detuning MOT phase, both f=2 and f=1 lasers are cooling light.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117253643A (en) * | 2023-09-22 | 2023-12-19 | 之江实验室 | System and method for realizing mesoscopic particle biaxial quantum ground state cooling |
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| CN117253643A (en) * | 2023-09-22 | 2023-12-19 | 之江实验室 | System and method for realizing mesoscopic particle biaxial quantum ground state cooling |
| CN117253643B (en) * | 2023-09-22 | 2024-03-08 | 之江实验室 | System and method for realizing mesoscopic particle biaxial quantum ground state cooling |
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