CN109491231A - A kind of left-right rotary circularly polarized light CPT atomic clock physical system device - Google Patents
A kind of left-right rotary circularly polarized light CPT atomic clock physical system device Download PDFInfo
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- CN109491231A CN109491231A CN201910057830.0A CN201910057830A CN109491231A CN 109491231 A CN109491231 A CN 109491231A CN 201910057830 A CN201910057830 A CN 201910057830A CN 109491231 A CN109491231 A CN 109491231A
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- G04F—TIME-INTERVAL MEASURING
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- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
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Abstract
A kind of left-right rotary circularly polarized light CPT atomic clock physical system device, including radiating laser beams device, lens, attenuator, polarizing film, first wave plate of λ/4, steam bubble, 2nd wave plate of λ/4, 0 ° of partially reflecting mirror and photodetector, the linear polarization circle divergent laser beam that radiating laser beams device issues is transformed into linear polarization collimated light beam by lens, then after obtaining the first linear polarization collimated light beam by polarizing film, pass through the first wave plate of λ/4, steam bubble, the second linear polarization collimated light beam is obtained after 2nd wave plate of λ/4, second linear polarization collimated light beam is through a part of the 2nd wave plate of λ/4 of reflectance-transmittance of 0 ° of partially reflecting mirror, steam bubble, first wave plate of λ/4 injects vertical cavity surface emitting laser after obtaining the second reflection linear polarization collimated light beam, another part is output to photodetector.Atom can be concentrated on " 0-0 energy level " by the present apparatus, enhanced CPT resonance signal, improved the signal-to-noise ratio and contrast of signal.In addition, all devices are all conducive to integrate the micromation, it can be achieved that passive-type CPT atomic clock in device.
Description
Technical field
The present invention relates to atomic clock technical field more particularly to a kind of left-right rotary circularly polarized light CPT atomic clock physical systems
Device is suitable for small-sized passive-type CPT atomic clock.
Background technique
Atomic clock is a kind of metrical instrument for being capable of providing chronometer time, and bubble type atomic clock is widely used in the whole world and determines
Position system, communication, military affairs etc..Physical system in atomic clock is the core component of atomic clock, is every country atomic clock
The key technology of level trial of strength.The core devices of physical system are atom steam bubbles, and steam bubble includes alkali metal atom and buffer gas,
Alkali metal atom is rubidium -87 or rubidium -85, caesium -133, and buffer gas is the gases such as nitrogen, methane, and for narrowing dimension, fluorescence is quenched
It goes out.As shown in Figure 1, the ground state level of atom splits into different magnetic sublevels under low-intensity magnetic field, due to two magnetic sublevel mF
=0 energy level (" 0-0 " energy level) is insensitive to magnetic field, therefore commonly uses the jump frequency v between them00As atomic clock frequency discrimination frequency
Rate.As the inswept ν of microwave frequency00When, resonance signal, which shows as detection optical signal, will appear a recess or protrusion, utilize local
This microwave frequency is locked in resonance signal in frequency corresponding to recess or protrusion, so that it may obtain by oscillator for generating microwave
Accurate local oscillator clock signal output.
Passive-type bubble type Atomic Clocks Based on Coherent Population Trapping is modulated to microwave is injected in laser, and is made using laser and atom
Coherent Population Trapping imprisons (Coherent Population Trapping, abbreviation CPT) covibration to identify microwave frequency.
The microwave of certain power is mixed by capacitor and inductive circuit with direct current, and mixed electric signal injects vertical cavity surface emitting laser
(Vertical-Cavity Surface-Emitting Laser, abbreviation VCSEL) generates polygon band light, the base of the polygon band light
Frequency is controlled by injection direct current and laser temperature, and the frequency difference of adjacent edge band is equal to microwave frequency, and each sideband luminous intensity meets shellfish plug
That function.CPT resonance needs two of them sideband to generate, and if ± 1 grade of sideband light, then referred to as half-breadth is modulated；If fundamental frequency (0 grade)
With+1 (or -1) grade sideband light, referred to as overall with is modulated.
The light that VCSEL is issued is linear polarization circle divergent beams, in order to obtain linear polarization collimated light beam, can be by VCSEL
9 are placed in the focus of lens 10, as shown in Fig. 2, beam intensity ratio VCSEL9 output intensity needed for CPT resonates is small, by the optical path
Appropriate attenuation piece 11 is set to control the light intensity into steam bubble 14, the effect of the wave plate of λ/4 13 is the linear polarization for exporting VCSEL 9
Light is transformed into left-handed (σ -) or dextrorotation (σ+) circularly polarized light.Steam bubble 14, which is placed in, to be atom, laser phase in the environment of accurate temperature control
Interaction provides required alkali metal atom steam.Since 0-0 energy level is that single order is insensitive to magnetic field, in order to them from other
Magnetic sublevel screens, while providing quantization axis for circularly polarized light transition, needs to add certain longitudinal magnetic field outside atomic bubble；
In addition the influence of the longitudinal magnetic field in remaining earth's magnetic field is prevented, usually in atom steam bubble outer cover magnetic screen.Control suitable VCSEL note
Enter direct current and temperature, two sidebands in VCSEL output light are for realizing CPT resonance.The detection of photodetector 16 penetrates steam bubble
14 laser, and it is changed into photo-signal.
The difference on the frequency that microwave frequency changes two sideband light is adjusted, when inswept hyperfine energy level " 0-0 " the resonance frequency of microwave frequency
When rate, a resonance signal will occur in photodetector output light electric current.It handles the resonance signal and obtains control microwave frequency
After realizing closed loop locking, accurate local oscillator clock signal output is can be obtained in negative-feedback signal.
The light source of above-mentioned traditional passive-type CPT atomic clock physical system scheme is single left-handed (or dextrorotation) circular polarization
Light.Circularly polarized laser is to the optical pumping effect of atom hyperfine splitting magnetic sublevel, so that most of atom accumulation is in ground state magnetic
On the sub- energy level of quantum number minimum (or maximum), and the atom in this energy level cannot be used for CPT resonance, we are referred to as at the state
" leakage " state.Fig. 1 illustrates this phenomenon, therefore signal contrast (the increased photoelectric current letter of CPT resonance by taking -87 atom of rubidium as an example
The ratio of number amplitude and the photo-signal amplitude of off-resonance) it is not high.And (professional domain claims the short-term frequency stability of atomic clock
Be frequency stability, actually refer to frequency instability) be inversely proportional with contrast, therefore the program manufacture atomic clock it is short
Phase stability is not high.
The scheme of left-right rotary circularly polarized light CPT resonance using the direction of propagation opposite left-handed (σ -) and dextrorotation (σ+) respectively with
Atom effect, can eliminate the atom in " leakage " state, improve signal contrast.Principle is as follows: the program can use a light
Illustrate with the four-level figure of atomic interaction, as shown in Figure 3.Not due to the corresponding transition coefficient of left-right rotary circularly polarized light
Together, the σ of same-phase and light intensity+CPT state function corresponding with σ-bi-coloured light phase difference is π, if the σ of same-phase and light intensity+with
σ-bi-coloured light, which acts on atom simultaneously, can interfere cancellation, to destroy CPT coherent state, can't see CPT resonance signal, if therefore
Time or spatially delay make σ+and σ-phase difference (2n+1) π (n is integer), so that it may reach the σ+and corresponding CPT of σ-
State function interference is mutually grown, so that CPT resonance signal enhances, and atom can be concentrated on to " 0-0 energy level ".VCSEL own resonance chamber
Have total reflection end face and light output end, be inserted into 0 ° of partially reflecting mirror outside emergent light end face, such total reflection end face VCSEL with
0 ° of partially reflecting mirror constitutes exterior resonant cavity, and the length of exterior resonant cavity isWherein c is the light velocity in vacuum, ν00For vapour
Magnetic quantum number is zero (m in the hyperfine Zeeman level of alkali metal atom ground state in bubbleF=0) jump frequency between two energy levels.Portion
Light splitting meeting feedback VCSEL reduces the demand of the microwave power of modulation electric current so that the sideband of VCSEL is locked by injection,
Therefore not only short-term stability can be significantly hotter than traditional CPT atomic clock to the atomic clock of left-right rotary circularly polarized light CPT resonance production, and
And also below traditional CPT atomic clock in microwave power consumption demand.
Summary of the invention
In response to the problems existing in the prior art, the purpose of the present invention is to provide a kind of left-right rotary circularly polarized light CPT atomic clocks
Atom can be concentrated on " 0-0 energy level " by physical system device, the device, so that CPT resonance signal enhances, improve the noise of signal
Than and contrast.In addition, all devices are all conducive to integrate the micromation, it can be achieved that passive-type CPT atomic clock in device.
The present invention can be achieved through the following technical solutions:
A kind of left-right rotary circularly polarized light CPT atomic clock physical system device, including radiating laser beams device, lens, decaying
Piece, polarizing film, the first wave plate of λ/4, steam bubble, the 2nd wave plate of λ/4,0 ° of partially reflecting mirror and photodetector；
The radiating laser beams device includes capacitor, inductance, current source and vertical cavity surface emitting laser, and current source is logical
It crosses inductance and provides driving current to vertical cavity surface emitting laser, microwave input is capacitively coupled to vertical cavity surface-emitting laser
Device；
The vertical cavity surface emitting laser is placed in the focus of lens, and lens issue vertical cavity surface emitting laser
Linear polarization circle divergent laser beam be transformed into linear polarization collimated light beam；
Attenuator, polarizing film, the first wave plate of λ/4, steam bubble, the 2nd wave plate of λ/4,0 ° of partially reflecting mirror and the photoelectricity is visited
Device is surveyed to be successively set in the exit direction of linear polarization collimated light beam；
The lens, attenuator, polarizing film, the first wave plate of λ/4, steam bubble, the 2nd wave plate of λ/4,0 ° of partially reflecting mirror and
The end face of photodetector is perpendicular with the direction of propagation of linear polarization collimated light beam；
The optical axis direction of first wave plate of λ/4 and the direction of propagation of linear polarization collimated light beam are in 45 degree of angles, the 2nd λ/4
The optical axis direction of wave plate is parallel with the optical axis direction of the first wave plate of λ/4；
The reflection end face of vertical cavity surface emitting laser constitutes exterior resonant cavity, the length of exterior resonant cavity with 0 ° of partially reflecting mirror
ForWherein, c is the light velocity in vacuum, v00For magnetic quantum number is in the hyperfine Zeeman level of alkali metal atom ground state in steam bubble
Jump frequency between zero two energy levels；The center of the steam bubble is located at the middle position of exterior resonant cavity.
In order to during simple declaration problem, below to left-right rotary circularly polarized light CPT atomic clock of the present invention department of physics
Bulk cargo, which is set, is referred to as the present apparatus.
The working principle of the present apparatus are as follows: the linear polarization circle divergent laser beam that radiating laser beams device issues is obtained by lens
To linear polarization collimated light beam, linear polarization collimated light beam obtains horizontal linear polarization light beam by polarizing film after attenuator is decayed,
Referred to as the first linear polarization collimated light beam, the first linear polarization collimated light beam obtain the first circular polarization directional light by the first wave plate of λ/4
Beam, the first circular polarization collimated light beam obtain the second linear polarization collimated light beam, the second line after passing sequentially through steam bubble and the 2nd wave plate of λ/4
The polarization direction for polarizing collimated light beam and the polarization direction of the first linear polarization collimated light beam are perpendicular, the second linear polarization collimated light beam
Enter photodetector detection through 0 ° of partially reflecting mirror rear portion light transmission, another part light reflects to obtain the first linear polarization anti-
Collimated light beam is penetrated, First Line reflection of polarization collimated light beam is changed into polarization direction by the 2nd wave plate of λ/4 and the first circular polarization is flat
The first perpendicular circular polarization reflection of parallel beam of row light beam, becomes inclined with First Line again by steam bubble and the first wave plate of λ/4
Shake parallel the second linear polarization reflection of parallel beam in collimated light beam polarization direction, and passes sequentially through polarizing film and attenuator becomes
Third linear polarization reflection of parallel beam, third linear polarization reflection of parallel beam obtain the first linear polarization circle by lens and reflect meeting
Poly- laser beam, and be injected into inside VCSEL.The above process repeats.
The linear polarization circle divergent laser beam, linear polarization collimated light beam, the first linear polarization collimated light beam, the first circle are inclined
Shake collimated light beam and the second linear polarization collimated light beam, First Line reflection of polarization collimated light beam, the first circular polarization reflection of parallel beam,
Second linear polarization reflection of parallel beam, third linear polarization reflection of parallel beam, the first linear polarization circle reflect convergent laser beam
Beam center is overlapped.
The linear polarization circle divergent laser beam, linear polarization collimated light beam, the first linear polarization collimated light beam, the first circle are inclined
Shake collimated light beam and the second linear polarization collimated light beam, First Line reflection of polarization collimated light beam, the first circular polarization reflection of parallel beam,
Second linear polarization reflection of parallel beam, third linear polarization reflection of parallel beam, the first linear polarization circle reflection convergent laser beam exist
Same plane.
The linear polarization circle divergent laser beam, linear polarization collimated light beam, the first linear polarization collimated light beam, the first circle are inclined
Shake collimated light beam and the second linear polarization collimated light beam, First Line reflection of polarization collimated light beam, the first circular polarization reflection of parallel beam,
Second linear polarization reflection of parallel beam, third linear polarization reflection of parallel beam, the first linear polarization circle reflect convergent laser beam
Total optical path isThat is twice of exterior resonant cavity length.
The first linear polarization collimated light beam direction of propagation is the positive axis direction of X-axis, First Line reflection of polarization collimated light beam
The direction of propagation is X-axis negative axis directions, and the optical axis direction and X-axis positive direction of the first wave plate of λ/4 are in 45 degree of angles, the 2nd wave plate of λ/4
Optical axis direction is parallel with the optical axis direction of the first wave plate of λ/4.
Preferably, the reflectivity of 0 ° of partially reflecting mirror is 50%.
Compared with prior art, the beneficial effects of the present invention are:
1, atom can be concentrated on " 0-0 energy level ", so that CPT resonance signal enhances, improves signal-to-noise ratio and the comparison of signal
Degree；
2, improving frequency is v00/ 2, for modulating the microwave efficiency of vertical cavity surface emitting laser electric current, microwave function is reduced
Consumption realizes low-power consumption passive-type CPT atomic clock；
3, all devices are all conducive to integrate the micromation, it can be achieved that passive-type CPT atomic clock in device
Detailed description of the invention
Fig. 1 is single circularly polarized light pumped alkali metal atomic ground state hyperfine structure Zeeman level population figure (with generation
For -87 atom of left-hand polarization optical pumping rubidium of table, vertical bar on energy level indicates single circularly polarized light pumping, energy level when stable state
I on population distribution).
Fig. 2 is the physical system schematic device of traditional passive-type Atomic Clocks Based on Coherent Population Trapping.
Fig. 3 is that left-right rotary circular polarization excitation CPT scheme four-level pumping scheme (is with representative -87 atom of rubidium
Example).
Fig. 4 be left-right rotary circular polarization excite CPT scheme alkali metal atom ground state hyperfine structure Zeeman level population figure (with
For representative -87 atom of rubidium, vertical bar on energy level indicates the pumping of left-right rotary circularly polarized light, ionic fractional abundance when stable state
Distribution).
Fig. 5 is left-right rotary circularly polarized light CPT atomic clock physical system schematic device of the present invention.
Fig. 6 is the exterior resonant cavity of the present apparatus and the position view of atom steam bubble.
Fig. 7 is the operation principle schematic diagram of left-right rotary circularly polarized light CPT atomic clock physical system device of the present invention.
Fig. 8 is the workflow schematic diagram of left-right rotary circularly polarized light CPT atomic clock physical system device of the present invention.
Fig. 9 is the typical CPT resonance line of left-right rotary circularly polarized light CPT atomic clock physical system device of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and specific embodiments.
Common alkali metal atom has caesium -133, rubidium -87, rubidium -85 etc. in passive-type Atomic Clocks Based on Coherent Population Trapping, selection
Common electric dipole transition D1 line and D2 line transition have half-breadth modulation and overall with to modulate the modulation method of VCSEL.The present invention with
Representative -87 atom of rubidium (its hyperfine structure Zeeman level population figure is as shown in Figure 4), the transition of D1 line, half-breadth modulation
For its specific embodiment is described in detail.
A kind of left-right rotary circularly polarized light CPT atomic clock physical system device, as shown in figure 5, include radiating laser beams device,
Lens 10, adjustable attenuator 11, polarizing film 12, the first wave plate of λ/4 13a, steam bubble 14, the 2nd wave plate of λ/4 13b, 0 ° of part are anti-
Penetrate mirror 15 and photodetector 16；
Radiating laser beams device includes capacitor 7, inductance 6, current source 5 and vertical cavity surface emitting laser 9, and current source 5 is logical
It crosses inductance 6 and provides driving current to vertical cavity surface emitting laser 9, microwave input 8 is coupled to vertical-cavity surface-emitting by capacitor 7
Laser 9；
Vertical cavity surface emitting laser 9 is placed in the focus of lens 10, and lens 10 issue vertical cavity surface emitting laser 9
Linear polarization circle divergent laser beam 18a be transformed into linear polarization collimated light beam 18b, lens 10 are by third linear polarization reflected parallel light
Beam 18f becomes in the first linear polarization circle reflection convergent laser beam 18i injection vertical cavity surface emitting laser 9.
The attenuator 11, polarizing film 12, the first wave plate of λ/4 13a, steam bubble 14, the 2nd wave plate of λ/4 13b, 0 ° of part are anti-
It penetrates mirror 15 and photodetector 16 is successively set in the exit direction of linear polarization collimated light beam 18b；
The lens 10, attenuator 11, polarizing film 12, the first wave plate of λ/4 13a, steam bubble 14, the 2nd wave plate of λ/4 13b,
The end face of 0 ° of partially reflecting mirror 15 and photodetector 16 is perpendicular with the direction of propagation of linear polarization collimated light beam 18b.
The linear polarization circle divergent laser beam 18a that radiating laser beams device issues passes through lens 10 and adjustable attenuator 11
Linear polarization collimated light beam 18b is obtained, linear polarization collimated light beam 18b obtains the first linear polarization collimated light beam 18c by polarizing film 12,
First linear polarization collimated light beam 18c obtains the first circular polarization collimated light beam 18d by the first wave plate of λ/4 13a, and the first circular polarization is flat
Row light beam 18d obtains the second linear polarization collimated light beam 18e, the second linear polarization after passing sequentially through steam bubble 14 and the 2nd wave plate of λ/4 13b
Collimated light beam 18e a part is input on photodetector 16 through 0 ° of partially reflecting mirror 15, and another part is reflected through 0 ° of part
The reflection of mirror 15 obtains First Line reflection of polarization collimated light beam 18f, and First Line reflection of polarization collimated light beam 18f is through the 2nd wave plate of λ/4
13b is transformed into the circularly polarized light 18g different from the first circular polarization polarization direction collimated light beam 18d, and again by 14 He of steam bubble
It is changed into polarization direction and the consistent second linear polarization reflection of parallel beam of linear polarization directional light 18c after first wave plate of λ/4 13a
18h, the second linear polarization reflection of parallel beam 18h become third linear polarization reflection of parallel beam 18i, third line by polarizing film 12
Reflection of polarization collimated light beam 18i becomes the first linear polarization circle reflection convergent laser beam 18j by lens, is injected into vertical cavity
Surface-emitting laser 9, as shown in Figure 7.
Linear polarization circle divergent laser beam 18a, linear polarization collimated light beam 18b, the first linear polarization collimated light beam 18c, first
Circular polarization collimated light beam 18d, the second linear polarization collimated light beam 18e, First Line reflection of polarization collimated light beam 18f, the first circular polarization
Reflection of parallel beam 18g, the second linear polarization reflection of parallel beam 18h, third linear polarization reflection of parallel beam 18i, First Line are inclined
The beam center of the round reflection convergent laser beam 18j of vibration is overlapped.In order to express easily, in fig. 5 and fig., linear polarization is round
Divergent laser beam 18a, linear polarization collimated light beam 18b, the first linear polarization collimated light beam 18c, the first circular polarization collimated light beam 18d,
Second linear polarization collimated light beam 18e and First Line reflection of polarization collimated light beam 18f, the first circular polarization reflection of parallel beam 18g, the
Two wires reflection of polarization collimated light beam 18h, third linear polarization reflection of parallel beam 18i, the first linear polarization circle reflect convergent laser
The beam center of beam 18j separates picture.
The reflection end face of vertical cavity surface emitting laser 9 constitutes exterior resonant cavity 19, exterior resonant cavity with 0 ° of partially reflecting mirror 15
19 it is a length ofWherein c is the light velocity in vacuum, v00For the hyperfine Zeeman level of alkali metal atom ground state in steam bubble
Jump frequency between two energy levels that middle magnetic quantum number is zero.The center of steam bubble 14 is placed on the middle position of exterior resonant cavity 19, such as
Shown in Fig. 6, linear polarization circle divergent laser beam 18a, linear polarization collimated light beam 18b, the first linear polarization collimated light beam 18c, first
Circular polarization collimated light beam 18d, the second linear polarization collimated light beam 18e, First Line reflection of polarization collimated light beam 18f, the first circular polarization
Reflection of parallel beam 18g, the second linear polarization reflection of parallel beam 18h, third linear polarization reflection of parallel beam 18i, First Line are inclined
The total optical path of the round reflection convergent laser beam 18j of vibration is
The first linear polarization direction of propagation collimated light beam 18c is the positive axis direction of X-axis, First Line reflection of polarization collimated light beam 18f
The direction of propagation is X-axis negative axis directions, and the optical axis and X-direction of the first wave plate of λ/4 13a is in 45 degree of angles, the 2nd wave plate of λ/4 13b's
Optical axis is parallel with the optical axis of the first wave plate of λ/4 13a.
As the optimization of the present embodiment, the reflectivity of 0 ° of partially reflecting mirror: transmissivity 1:1, i.e. reflectivity are 50%
Lens are placed in the exit direction of linear polarization collimated light beam 18b.
The first linear polarization direction of propagation collimated light beam 18c is X-axis positive direction, and the linearly polarized light beam in X-direction is by the
Become left-handed (or dextrorotation) circularly polarized light of magnetic after the wave plate of one λ/4 13a.Left-handed (or dextrorotation) circularly polarized light of magnetic is defined as oneself of photon
Direction reversed (or in the same direction) is revolved in quantization axis direction, therefore left-handed (or dextrorotation) the circularly polarized light photon rear axle of one magnetic of Atomic absorption
Reduce (or increase) to spin angular momentaum
It is similar to the method for traditional passive-type CPT atomic clock ,+1 grade in the laser that vertical cavity surface emitting laser 9 is emitted
Sideband light, which is adjusted, to be arrived and -87 atom of rubidium | 5S1/2, F=1 > with | 5P1/2, the electric dipole transition resonance of the energy level of F=2 > two, -1 grade of side
Band light, which is adjusted, to be arrived and -87 atom of rubidium | 5S1/2, F=2 > with | 5P1/2, the electric dipole transition resonance of the energy level of F=2 > two.
The frequency of microwave input 8 is scanned, the electric current of photodetector 16 exports the power that 17 sizes have reacted CPT resonance,
Electric current output 17 is the frequency identification signal of microwave input 8, i.e. realization frequency discrimination, whole flow process is as shown in Figure 8.
The present invention compared with traditional passive-type Atomic Clocks Based on Coherent Population Trapping scheme, the frequency discrimination signal amplitude of acquisition obviously compared with
Greatly, as shown in figure 9, the performance of passive-type Atomic Clocks Based on Coherent Population Trapping can be effectively improved.
Above embodiment is a representative special case of the invention, and the technical staff of same domain by knowing altogether
Common sense and the present invention can obtain alkali metal atom (caesium -133, rubidium -87, rubidium -85), different spectral lines (D1 line and D2 line), different modulating
The implementing method of mode (half-breadth modulation and overall with modulation).
Claims (2)
1. a kind of left-right rotary circularly polarized light CPT atomic clock physical system device, it is characterised in that: including radiating laser beams device,
Lens, attenuator, polarizing film, the first wave plate of λ/4, steam bubble, the 2nd wave plate of λ/4,0 ° of partially reflecting mirror and photodetector；
The radiating laser beams device includes capacitor, inductance, current source and vertical cavity surface emitting laser, and current source passes through electricity
Feel and provide driving current to vertical cavity surface emitting laser, microwave input is capacitively coupled to vertical cavity surface emitting laser；
The vertical cavity surface emitting laser is placed in the focus of lens, the line that lens issue vertical cavity surface emitting laser
It polarizes round divergent laser beam and is transformed into linear polarization collimated light beam；
Attenuator, polarizing film, the first wave plate of λ/4, steam bubble, the 2nd wave plate of λ/4,0 ° of partially reflecting mirror and the photodetector
It is successively set in the exit direction of linear polarization collimated light beam；Lens, attenuator, polarizing film, the first wave plate of λ/4, steam bubble, second
The end face of the wave plate of λ/4,0 ° of partially reflecting mirror and photodetector is perpendicular with the direction of propagation of linear polarization collimated light beam；
The optical axis direction of first wave plate of λ/4 and the direction of propagation of linear polarization collimated light beam are in 45 degree of angles, the 2nd wave plate of λ/4
Optical axis direction it is parallel with the optical axis direction of the first wave plate of λ/4；
The reflection end face of vertical cavity surface emitting laser constitutes exterior resonant cavity with 0 ° of partially reflecting mirror, and the length of exterior resonant cavity isWherein, c is the light velocity in vacuum, v00For magnetic quantum number is zero in the hyperfine Zeeman level of alkali metal atom ground state in steam bubble
Two energy levels between jump frequency；
The center of the steam bubble is located at the middle position of exterior resonant cavity.
2. according to left-right rotary circularly polarized light CPT atomic clock physical system device described in claim l, it is characterised in that: described
0 ° of partially reflecting mirror reflectivity be 50%.
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Cited By (7)
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| CN110196549A (en) * | 2019-06-29 | 2019-09-03 | 蚌埠学院 | A kind of device for realizing orthogonal circular polarizations light CPT atomic clock physical system |
| CN110333651A (en) * | 2019-07-15 | 2019-10-15 | 温州激光与光电子协同创新中心 | Laser atom clock based on the locking of Coherent Population Trapping number Duress Mode |
| CN110750044A (en) * | 2019-11-07 | 2020-02-04 | 蚌埠学院 | Integrated CPT atomic clock physical system device |
| CN112304442A (en) * | 2020-10-28 | 2021-02-02 | 中国科学院国家授时中心 | Dual-modulation CPT differential detection method and system |
| CN113406876A (en) * | 2021-06-18 | 2021-09-17 | 中国科学院国家授时中心 | Continuous CPT state preparation and differential detection method and system |
| CN113534649A (en) * | 2021-05-31 | 2021-10-22 | 中国计量科学研究院 | CPT atomic clock physical system and method for realizing same |
| CN114675524A (en) * | 2022-04-08 | 2022-06-28 | 湖北科技学院 | Miniature CPT atomic clock physical system device |
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| CN110196549A (en) * | 2019-06-29 | 2019-09-03 | 蚌埠学院 | A kind of device for realizing orthogonal circular polarizations light CPT atomic clock physical system |
| CN110333651A (en) * | 2019-07-15 | 2019-10-15 | 温州激光与光电子协同创新中心 | Laser atom clock based on the locking of Coherent Population Trapping number Duress Mode |
| CN110333651B (en) * | 2019-07-15 | 2021-04-02 | 温州激光与光电子协同创新中心 | Laser atomic clock locked based on coherent population trapping mode |
| CN110750044A (en) * | 2019-11-07 | 2020-02-04 | 蚌埠学院 | Integrated CPT atomic clock physical system device |
| CN112304442A (en) * | 2020-10-28 | 2021-02-02 | 中国科学院国家授时中心 | Dual-modulation CPT differential detection method and system |
| CN112304442B (en) * | 2020-10-28 | 2022-09-02 | 中国科学院国家授时中心 | Dual-modulation CPT differential detection method and system |
| CN113534649A (en) * | 2021-05-31 | 2021-10-22 | 中国计量科学研究院 | CPT atomic clock physical system and method for realizing same |
| CN113534649B (en) * | 2021-05-31 | 2022-11-22 | 中国计量科学研究院 | CPT atomic clock physical system and method for realizing same |
| CN113406876A (en) * | 2021-06-18 | 2021-09-17 | 中国科学院国家授时中心 | Continuous CPT state preparation and differential detection method and system |
| CN113406876B (en) * | 2021-06-18 | 2022-07-12 | 中国科学院国家授时中心 | Continuous CPT state preparation and differential detection method and system |
| CN114675524A (en) * | 2022-04-08 | 2022-06-28 | 湖北科技学院 | Miniature CPT atomic clock physical system device |
| CN114675524B (en) * | 2022-04-08 | 2024-02-09 | 湖北科技学院 | Miniature CPT atomic clock physical system device |
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