CN107015473B - A kind of small light clock of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization - Google Patents
A kind of small light clock of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization Download PDFInfo
- Publication number
- CN107015473B CN107015473B CN201710192626.0A CN201710192626A CN107015473B CN 107015473 B CN107015473 B CN 107015473B CN 201710192626 A CN201710192626 A CN 201710192626A CN 107015473 B CN107015473 B CN 107015473B
- Authority
- CN
- China
- Prior art keywords
- light
- laser
- alkali metal
- frequency
- wave plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of small light clocks of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization.The cubic surface technology of the integrated application of the present invention: super-narrow line width interferometric filter external cavity semiconductor laser, Modulation Transfer spectrum, narrow linewidth alkali metal atom transition spectral line and fast phase modulation feedback, the optical maser wavelength that laser issues is locked in the transition spectrum of alkali metal atom by the miniature laser frequency standard for innovatively realizing high stability；The locking of laser frequency can be better achieved with independent control in the light intensity of detection light and pump light；The interference of low-frequency noise can be effectively avoided in Modulation Transfer spectral technology, while having more flat back end；Integrated innovation of the present invention brings the rapid promotion in performance indicator, the miniature laser frequency standard for the high stability realized, second stability reaches 10‑14, it is more than other all wave band optical frequency quantum frequency standards of alkali metal atom and two orders of magnitude of length standard in the world at present on Stability index.
Description
Technical field
The invention belongs to atomic clocks and frequency standard technical field, and in particular to a kind of alkali based on Modulation Transfer spectrum frequency stabilization
The small light clock of metal and its control method.
Background technique
With the rapid development of semiconductor laser technology and the continuous improvement of semiconductor laser performance, semiconductor swashs
Light device is widely used in the basic research fields such as laser spectrum, laser cooling, atomic and molecular physics, optical frequency atomic clock.Freely
The output frequency of the semiconductor laser of operating is the irregular amount changed over time, by parameter fluctuations such as temperature, electric currents
Influence, frequency can generate big drift and broadening.More high stability is chased after with basic research fields such as optical frequency atomic clocks
It asks, to the performance of laser, higher requirements are also raised, it is desirable that the output frequency of laser is more stable.In order to improve laser
The stability series of frequency can carry out automatic frequency trimming to laser cavity by the reference frequency source of a high stable, flat in dynamic
Keep output laser frequency constant in weighing apparatus.This reference frequency source can be the passive cavity of a high stable, be also possible to atom
Or the spectral line of molecule.In order to realize the long-term stability of laser frequency, need by laser frequency lock atom transition spectral line
On.
Common laser steady frequency technology mainly has the nonlinear opticals spectral technologies such as saturated absorption spectral technology, polarization spectral technology.Its
In, saturated absorption spectral technology is the most common laser frequency stabiliz ation method, but it is needed in laser frequency plus modulated signal, then by steady
Error signal feedback is generated after frequency circuit demodulation to laser.Due to having added modulated signal, so that laser output frequency and amplitude
It is impacted, introduce additional noise.Polarization spectral technology is a kind of not need modulation scheme i.e. and can produce the atom light of error signal
Spectral technology, but its wider bandwidth can introduce higher low-frequency noise, while practical zero point value can be with factors such as optical powers
Change and change, thus also receives certain restrictions.
Summary of the invention
In order to overcome the shortcomings of that the Frequency Stabilization Techniques such as saturated absorption spectrum and polarized spectrum, the present invention provide a kind of based on Modulation Transfer
The small light clock of alkali metal and its control method of frequency stabilization are composed, using Modulation Transfer spectral technology, modulating frequency is tied simultaneously in radio frequency band
It closes techniques of phase-sensitive detecting technique and realizes heterodyne detection, be effectively prevented from the interference of low-frequency noise, improve the signal-to-noise ratio of error signal, realize
The high performance small light clock of alkali metal.
An object of the present invention is to provide a kind of small light clocks of alkali metal based on Modulation Transfer spectrum frequency stabilization.
The small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization of the invention includes: laser, the first half-wave plate, the second half
Wave plate, third half-wave plate, the first polarization splitting prism, alkali metal atom, glass envelope, the second polarization splitting prism, phase-modulation
Device, magnetic screen box, photodetector, frequency mixer, signal generator, servo feedback circuit and Laser Power Devices；Wherein, in glass envelope
Filled with alkali metal atom and buffer gas, glass envelope is placed in magnetic screen box；Laser Power Devices drive laser to issue laser；Laser
The unequal two beams laser of intensity is divided by the first polarization splitting prism by the first half-wave plate, by rotation the first half-wave plate with
Angle between first polarization splitting prism adjusts the intensity of two beam laser；The weaker laser of intensity as detection light, intensity compared with
For strong laser as pump light, pump light and the polarization direction for detecting light are orthogonal；Light is detected to enter by the second half-wave plate
In glass envelope；Signal generator provides driving signal for phase-modulator, and pump light passes through phase-modulator, phase-modulator pair
Pump light carries out phase-modulation, so that pump light has on the basis of dominant frequency, there are two sidebands；Pump light through third half-wave plate and
Enter glass envelope after the reflection of second polarization splitting prism；The position of phase-modulator and third half-wave plate is interchangeable；In glass envelope
In, the dominant frequency of the dominant frequency of pump light and two sidebands and detection light interacts by medium of alkali metal atom, by non-
Four linear frequency mixing effects, two sidebands of pump light are modulated on detection light, to detect light with dominant frequency and two
Sideband；Detection light is received through the second polarization splitting prism by photodetector, detects the sideband and dominant frequency beat frequency of light；Beat signal
It is transmitted to frequency mixer, signal generator provides reference signal for frequency mixer, demodulation is modulated with beat signal, to demodulate
High performance Modulation Transfer spectrum signal；Modulation Transfer spectrum signal returns Laser Power Devices by servo feedback electronic feedback, to will swash
The optical maser wavelength that light device issues is locked in the transition spectrum of alkali metal atom.
Second half-wave plate passes through the second half-wave plate of rotation and the second polarization splitting prism in conjunction with the second polarization splitting prism
Between angle, adjust be emitted from the second devating prism detection light light intensity, i.e., detector detect detect light light intensity.
Third half-wave plate and the second polarization splitting prism combine, by between rotation third half-wave plate and the second polarization splitting prism
Angle adjusts the light intensity that the pump light in glass envelope is reflexed to by the second polarization splitting prism.
Further, it is provided with the 4th half-wave plate in the optical path of pump light, the 4th half-wave plate is by the pump light of linear polarization
Polarization direction be adjusted to it is parallel with the optical axis direction of phase-modulator, to guarantee the generation of phase-only modulation process, to avoid surplus
The influence of the mechanism such as remaining amplitude modulation.
Further, the invention also includes the first attenuators and the second attenuator, are individually positioned in detection light and pump light not
Into in the optical path of glass envelope, change the light intensity of detection light and pump light respectively.
Glass envelope is cylindrical housings, and both ends of the surface are smooth, will not cause the deformation of laser facula；Filled with alkali gold in glass envelope
Belong to atom and buffer gas；Alkali metal atom is one of rubidium, caesium, potassium and sodium；Buffer gas use inert gas, as argon,
Krypton or xenon.The outer wall of glass envelope is wound with heating element, and heating element uses heating sheet；Heating element is controlled by temperature control circuit
The accurate control to glass envelope temperature is realized in heating.
Laser uses super-narrow line width interferometric filter external cavity semiconductor laser.
Phase-modulator uses acousto-optic modulator or electrooptic modulator.
It is another object of the present invention to provide a kind of controls of small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization
Method.
The control method of the small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization of the invention, comprising the following steps:
1) alkali metal atom and buffer gas are filled in glass envelope, glass envelope are placed in magnetic screen box, and in glass
The outer wall of bubble winds heating element；
2) Laser Power Devices driving laser issues laser, and laser is divided by the first half-wave plate by the first polarization splitting prism
The unequal two beams laser of intensity adjusts two beams by adjusting the angle between the first half-wave plate and the first polarization splitting prism
The intensity of laser, the weaker laser of intensity is as detection light, and the stronger laser of intensity is as pump light, pump light and detection light
Polarization direction is orthogonal；
3) detection light enters in glass envelope by the second half-wave plate, the second half-wave plate in conjunction with the second polarization splitting prism,
By the angle between the second half-wave plate of rotation and the second polarization splitting prism, the detection light being emitted from the second devating prism is adjusted
Light intensity, i.e., detector detect detection light light intensity；
4) signal generator provides driving signal for phase-modulator, and pump light passes through phase-modulator, phase-modulator
Phase-modulation is carried out to pump light, there are two sidebands so that pump light has on the basis of dominant frequency, and pump light is through third half-wave plate
Enter glass envelope with after the reflection of the second polarization splitting prism, third half-wave plate and the second polarization splitting prism combine, and pass through rotation
Turn the angle between third half-wave plate and the second polarization splitting prism, adjusts and reflex to glass envelope by the second polarization splitting prism
In pump light light intensity, the position of phase-modulator and third half-wave plate is interchangeable；
5) in glass envelope, the dominant frequency of the dominant frequency of pump light and two sidebands and detection light, using alkali metal atom as medium
It interacts, by nonlinear four frequencies mixing effect, two sidebands of pump light are modulated on detection light, to visit
Surveying light has dominant frequency and two sidebands；
6) detection light is received through the second polarization splitting prism by photodetector, detects the sideband and dominant frequency beat frequency of light；
7) beat signal is transmitted to frequency mixer, and signal generator provides reference signal for frequency mixer, carries out with beat signal
Modulation /demodulation, to demodulate high performance Modulation Transfer spectrum signal；
8) Modulation Transfer spectrum signal returns Laser Power Devices by servo feedback electronic feedback, thus the laser that laser is issued
Wavelength locking is in the transition spectrum of alkali metal atom.
Wherein, in step 1), alkali metal atom is one of rubidium, caesium, potassium and sodium；Buffer gas uses indifferent gas
Body, such as argon, krypton or xenon.
In step 2), Laser Power Devices control the operating temperature and electric current of laser, and adjust the long piezoelectricity of laser chamber
The voltage of ceramics.
In step 4), the modulating frequency of phase-modulator and the absorption spectra of the alkali metal atom after broadening are in same amount
Grade.
In step 4), further, it is provided with the 4th half-wave plate in the optical path of pump light, the 4th half-wave plate is by linear polarization
Pump light polarization direction be adjusted to it is parallel with the optical axis direction of phase-modulator, to guarantee the hair of phase-only modulation process
It is raw, to avoid the influence of the mechanism such as residual amplitude modulation.
Further, in the optical path that detection light and pump light do not enter glass envelope, the first attenuator and second is respectively set
Attenuator independently controls, the light intensity of optimization detection light and pump light, so that the Modulation Transfer spectrum signal that frequency mixer demodulates
Centre frequency at maximum slope, be optimal the locking effect of optical maser wavelength.
Advantages of the present invention:
The cubic surface technology of the integrated application of the present invention: super-narrow line width interferometric filter external cavity semiconductor laser, Modulation Transfer
Spectrum, narrow linewidth alkali metal atom transition spectral line and fast phase modulation feedback, innovatively realize the miniature laser of high stability
The optical maser wavelength that laser issues is locked in the transition spectrum of alkali metal atom by frequency standard, and line width is less than 50kHz, also surpasses
Cross the microwave clock stability of all various different atoms in the world；The light intensity of detection light and pump light can be passed through with independent control
Optimize laser intensity, makes the maximum slope at the error signal centre frequency demodulated, the locking of laser frequency is better achieved；
The interference of low-frequency noise can be effectively avoided in Modulation Transfer spectral technology, while having more flat back end；The present invention is integrated
Innovation brings the rapid promotion in performance indicator, the miniature laser frequency standard for the high stability realized, second stability
Reach 10-14, it is more than other all wave band optical frequency quantum frequency standards of alkali metal atom in the world at present on Stability index
With two orders of magnitude of length standard.
Detailed description of the invention
Fig. 1 is the schematic diagram of the embodiment one of the alkali metal small light clock of the invention that frequency stabilization is composed based on Modulation Transfer；
Fig. 2 is the schematic diagram of the embodiment two of the alkali metal small light clock of the invention that frequency stabilization is composed based on Modulation Transfer.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the present invention is further explained.
Embodiment one
As shown in Figure 1, the small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization of the present embodiment includes: laser 1, first
Half-wave plate 2, the second half-wave plate 4, third half-wave plate 12, the first polarization splitting prism 3, alkali metal atom, glass envelope 6, second are inclined
Amici prism 9, phase-modulator 13, magnetic screen box 7, photodetector 16, frequency mixer 17, signal generator 18, the servo of shaking are anti-
Current feed circuit 19 and Laser Power Devices 20；Wherein, glass envelope outer wall winds heating element 8, eases up in glass envelope 6 filled with alkali metal atom
Qi of chong channel ascending adversely body, glass envelope 6 are placed in magnetic screen box 7；Laser Power Devices 20 drive laser 1 to issue laser；Laser passes through the first half-wave
Piece 2 is divided into the unequal two beams laser of intensity by the first polarization splitting prism 3, by adjusting the first polarization splitting prism 3 first
Angle between polarization splitting prism 3 controls the intensity of two beam laser；For the weaker laser of intensity as detection light, intensity is stronger
Laser as pump light, the polarization direction of pump light and detection light is orthogonal；It is saturating from the first polarization splitting prism 3 to detect light
It penetrates, enters in glass envelope 6 by the second half-wave plate 4；Signal generator 18 is that phase-modulator 13 provides driving signal, pump light
Reflected from the first polarization splitting prism 3, then by the reflection of the second high reflective mirror 11 after, by pump light through third half-wave plate 12, enter
Phase-modulator 13, phase-modulator 13 carry out phase-modulation to pump light, so that pump light has two on the basis of dominant frequency
A sideband；By the angle between the second half-wave plate of rotation and the second polarization splitting prism, so that from the second polarization splitting prism
The detection light of transmission reaches maximum, and reflected light is minimum；It is reflected through third high reflective mirror 15, then anti-through the second polarization splitting prism 9
Enter glass envelope 6 after penetrating, by the angle between rotation third half-wave plate 12 and the second polarization splitting prism 9, so that through second
The light intensity that the pump light in glass envelope is entered to after polarization splitting prism reflection is maximum, and transmitted light is minimum；In glass envelope 6,
The dominant frequency of the dominant frequency of pump light and two sidebands and detection light, interacts by medium of alkali metal atom, by non-thread
Property four frequency mixing effects, two sidebands of pump light are modulated on detection light, to detect light with dominant frequency and two sides
Band；Detection light is transmitted from the second polarization splitting prism 9, after the reflection of the first high reflective mirror 10, is received, is detected by photodetector 16
The sideband and dominant frequency beat frequency of light；Beat signal is transmitted to frequency mixer 17, and signal generator 18 is that frequency mixer 17 provides reference signal,
It is modulated demodulation with beat signal, to demodulate high performance Modulation Transfer spectrum signal；Modulation Transfer spectrum signal is by watching
It takes feed circuit 19 and feeds back to Laser Power Devices 20.
In the present embodiment, alkali metal atom uses rubidium atom.Rubidium atom is that have very highlightedly in meterological field
A kind of atom of position: on the one hand in terms of microwave quantum frequency standard (atomic clock), 85 atom of isotope rubidium is used to realize
The microwave atomic clock of 3.0GHz, 87 atom of isotope rubidium can be used to implement the microwave atomic clock of 6.8GHz；On the other hand in light
In terms of frequency quantum frequency standard and length standard, rubidium atom is in 780nm, two-photon 778nm, the 1529nm of optical communicating waveband, all
Provide good quantum frequency reference.
Laser 1 use super-narrow line width interferometric filter external cavity semiconductor laser, Output of laser wavelength be 420nm or
421nm；When the output wavelength of laser is 420nm, the frequency of laser is locked in rubidium atomic ground state by servo feedback circuit 19
5S1/2To Second Excited State 6P3/2Transition spectral line on；When the output wavelength of laser is 421nm, the frequency of laser is anti-by servo
Current feed circuit 19 is locked in rubidium atomic ground state 5S1/2To Second Excited State 6P1/2Transition spectral line on.
The control method of the small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization of the present embodiment, comprising the following steps:
1) rubidium atom and 100 Torrs of argon gas are filled in glass envelope 6, glass envelope are placed in magnetic screen box 7, and in glass envelope
Outer wall wind heating element 8, temperature control circuit heats heating element 8, the accurate temperature for controlling glass envelope 6；
2) Laser Power Devices driving laser issues laser, and laser is divided by the first half-wave plate 2 by the first polarization splitting prism 3
It is adjusted at the unequal two beams laser of intensity by the angle between the first half-wave plate 2 of rotation and the first polarization splitting prism 3
The intensity of two beam laser, the weaker laser of intensity is as detection light, and the stronger laser of intensity is as pump light, pump light and detection
The polarization direction of light is orthogonal；
3) detection light is transmitted from the first polarization splitting prism 3, is entered in glass envelope 6 by the second half-wave plate 4, the second half-wave
Piece, by the angle between the second half-wave plate of rotation and the second polarization splitting prism, is adjusted in conjunction with the second polarization splitting prism
The light intensity for the detection light that the light intensity of the detection light transmitted from the second devating prism, i.e. detector detect；
4) signal generator 18 is that phase-modulator 13 provides driving signal, and pump light is anti-from the first polarization splitting prism 3
Penetrate, then by the second high reflective mirror 11 reflection after, by pump light through third half-wave plate 12, into phase-modulator 13, phase-modulation
Device 13 carries out phase-modulation to pump light, so that pump light has on the basis of dominant frequency, there are two sidebands；Through third high reflective mirror 15
Reflection, then enter glass envelope 6,9 phase of third half-wave plate 12 and the second polarization splitting prism after the reflection of the second polarization splitting prism 9
In conjunction with by the angle between rotation third half-wave plate and the second polarization splitting prism, the second polarization splitting prism is passed through in adjusting
It is reflected into the light intensity of the pump light into glass envelope；
5) in glass envelope, the dominant frequency of the dominant frequency of pump light and two sidebands and detection light occurs by medium of rubidium atom
Interaction, by nonlinear four frequencies mixing effect, two sidebands of pump light are modulated on detection light, to detect light
With dominant frequency and two sidebands；
6) detection light is transmitted from the second polarization splitting prism 9, after the reflection of the first high reflective mirror 10, is connect by photodetector 16
It receives, detects the sideband and dominant frequency beat frequency of light；
7) beat signal is transmitted to frequency mixer 17, and signal generator 18 provides reference signal for frequency mixer, with beat signal
It is modulated demodulation, to demodulate high performance Modulation Transfer spectrum signal；
8) Modulation Transfer spectrum signal feeds back to the current terminal and piezoelectric ceramics of Laser Power Devices 20 by servo feedback circuit 19
End, so that the output frequency of laser 1 is locked on the atomic transition spectral line of 420nm or 421nm.
Embodiment two
In the present embodiment, detection light and pump light do not enter glass envelope optical path on place respectively the first attenuator 5 and
Second attenuator 14, independently the light intensity of control detection light and pump light is made by the light intensity of optimization pump light and detection light
The maximum slope at the error signal centre frequency that frequency mixer 17 demodulates is obtained, the locking effect of laser frequency is optimal.
Also, the 4th half-wave plate 21 is provided in the optical path of pump light, the 4th half-wave plate is by the polarization direction of the pump light of linear polarization
Be adjusted to it is parallel with the optical axis direction of phase-modulator, to guarantee the generation of phase-only modulation process, to avoid remaining amplitude tune
System etc. mechanism influence other with embodiment one.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field
Technical staff be understood that without departing from the spirit and scope of the invention and the appended claims, it is various replacement and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
Subject to the range that sharp claim defines.
Claims (10)
1. a kind of small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization, which is characterized in that the small light clock of alkali metal includes: super
Narrow linewidth interferometric filter external cavity semiconductor laser, the first half-wave plate, the second half-wave plate, third half-wave plate, the first polarization point
Light prism, alkali metal atom, glass envelope, the second polarization splitting prism, phase-modulator, magnetic screen box, photodetector, mixing
Device, signal generator, servo feedback circuit and Laser Power Devices；Wherein, ease up qi of chong channel ascending adversely in the glass envelope filled with alkali metal atom
Body, glass envelope are placed in magnetic screen box；The Laser Power Devices driving laser issues laser；Laser is by the first half-wave plate by the
One polarization splitting prism is divided into the unequal two beams laser of intensity, by rotation the first half-wave plate and the first polarization splitting prism it
Between angle, adjust two beam laser intensity；The weaker laser of intensity is as detection light, and the stronger laser of intensity is as pumping
The polarization direction of light, pump light and detection light is orthogonal；Detection light enters in glass envelope by the second half-wave plate；The signal
Generator provides driving signal for phase-modulator, and pump light passes through phase-modulator, and phase-modulator carries out phase to pump light
Position modulation, so that pump light has on the basis of dominant frequency, there are two sidebands；Pump light is through third half-wave plate and the second polarization spectro
Enter glass envelope after prismatic reflection；The position of phase-modulator and third half-wave plate is interchangeable；In glass envelope, the master of pump light
The dominant frequency of frequency and two sidebands and detection light, interacts by medium of alkali metal atom, mixed by nonlinear four frequency
Frequency effect, two sidebands of pump light are modulated on detection light, to detect light with dominant frequency and two sidebands；Detect light warp
Second polarization splitting prism is received by photodetector, detects the sideband and dominant frequency beat frequency of light；Beat signal is transmitted to frequency mixer,
The signal generator provides reference signal for frequency mixer, is modulated demodulation with beat signal, to demodulate high performance
Modulation Transfer spectrum signal；Modulation Transfer spectrum signal returns Laser Power Devices by servo feedback electronic feedback, so that laser be issued
Optical maser wavelength be locked in alkali metal atom transition spectrum on；The small light clock of alkali metal integrates outside super-narrow line width interferometric filter
Cavity semiconductor laser, Modulation Transfer spectrum, narrow linewidth alkali metal atom transition spectral line and fast phase modulation feedback.
2. the small light clock of alkali metal as described in claim 1, which is characterized in that second half-wave plate and the second polarization spectro rib
Mirror combines, and by the angle between the second half-wave plate of rotation and the second polarization splitting prism, adjusts and is emitted from the second devating prism
Detection light light intensity, i.e., detector detect detection light light intensity；The third half-wave plate and the second polarization splitting prism
It combines, by the angle between rotation third half-wave plate and the second polarization splitting prism, adjusts and pass through the second polarization spectro rib
Mirror reflexes to the light intensity of the pump light in glass envelope.
3. the small light clock of alkali metal as described in claim 1, which is characterized in that it further include the 4th half-wave plate, the 4th half-wave
Piece is arranged in the optical path of pump light, and the polarization direction of the pump light of linear polarization is adjusted to put down with the optical axis direction of phase-modulator
Row.
4. the small light clock of alkali metal as described in claim 1, which is characterized in that it further include the first attenuator and the second attenuator,
First attenuator and the second attenuator are individually positioned in detection light and pump light does not enter in the optical path of glass envelope, change respectively
Become the light intensity of detection light and pump light.
5. the small light clock of alkali metal as described in claim 1, which is characterized in that the glass envelope is cylindrical housings, both ends of the surface
It is smooth, the deformation of laser facula will not be caused；Filled with alkali metal atom and buffer gas in glass envelope；The alkali metal atom is
One of rubidium, caesium, potassium and sodium；The buffer gas uses inert gas.
6. the small light clock of alkali metal as described in claim 1, which is characterized in that the outer wall of the glass envelope is wound with heating element,
Heating element uses heating sheet；The heating of heating element is controlled by temperature control circuit, realizes the accurate control to glass envelope temperature.
7. a kind of control method of the small light clock of alkali metal based on Modulation Transfer spectrum frequency stabilization, which is characterized in that the control method
The following steps are included:
1) alkali metal atom and buffer gas are filled in glass envelope, glass envelope are placed in magnetic screen box, and in glass envelope
Outer wall winds heating element；
2) Laser Power Devices driving super-narrow line width interferometric filter external cavity semiconductor laser issues laser, and laser passes through the first half-wave
Piece is divided into the unequal two beams laser of intensity by the first polarization splitting prism, by adjusting the first half-wave plate and the first polarization spectro
Angle between prism adjusts the intensity of two beam laser, and the weaker laser of intensity is as detection light, the stronger laser conduct of intensity
The polarization direction of pump light, pump light and detection light is orthogonal；
3) detection light enters in glass envelope by the second half-wave plate, and the second half-wave plate passes through in conjunction with the second polarization splitting prism
The angle between the second half-wave plate and the second polarization splitting prism is rotated, the light for the detection light being emitted from the second devating prism is adjusted
By force, i.e., detector detect detection light light intensity；
4) signal generator provides driving signal for phase-modulator, and pump light passes through phase-modulator, and phase-modulator is to pump
Pu light carries out phase-modulation so that pump light have on the basis of dominant frequency there are two sideband, pump light is through third half-wave plate and the
Enter glass envelope after the reflection of two polarization splitting prisms, third half-wave plate and the second polarization splitting prism combine, and passes through rotation the
Angle between three half-wave plates and the second polarization splitting prism is adjusted and is entered in glass envelope by the second polarization splitting prism
The position of the light intensity of pump light, phase-modulator and third half-wave plate is interchangeable；
5) in glass envelope, the dominant frequency of the dominant frequency of pump light and two sidebands and detection light occurs by medium of alkali metal atom
Interaction, by nonlinear four frequencies mixing effect, two sidebands of pump light are modulated on detection light, to detect light
With dominant frequency and two sidebands；
6) detection light is received through the second polarization splitting prism by photodetector, detects the sideband and dominant frequency beat frequency of light；
7) beat signal is transmitted to frequency mixer, and signal generator provides reference signal for frequency mixer, is modulated with beat signal
Demodulation, to demodulate high performance Modulation Transfer spectrum signal；
8) Modulation Transfer spectrum signal returns Laser Power Devices by servo feedback electronic feedback, thus the optical maser wavelength that laser is issued
It is locked in the transition spectrum of alkali metal atom.
8. control method as claimed in claim 7, which is characterized in that in step 2), Laser Power Devices control the work of laser
Make temperature and electric current, and adjusts the voltage of the long piezoelectric ceramics of laser chamber.
9. control method as claimed in claim 7, which is characterized in that in step 4), the modulating frequency of phase-modulator with
The absorption spectra of alkali metal atom after broadening is in same magnitude.
10. control method as claimed in claim 7, which is characterized in that in step 4), further, in the optical path of pump light
On be provided with the 4th half-wave plate, the polarization direction of the pump light of linear polarization is adjusted to the optical axis with phase-modulator by the 4th half-wave plate
Direction is parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710192626.0A CN107015473B (en) | 2017-03-28 | 2017-03-28 | A kind of small light clock of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710192626.0A CN107015473B (en) | 2017-03-28 | 2017-03-28 | A kind of small light clock of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107015473A CN107015473A (en) | 2017-08-04 |
| CN107015473B true CN107015473B (en) | 2019-06-07 |
Family
ID=59445891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710192626.0A Active CN107015473B (en) | 2017-03-28 | 2017-03-28 | A kind of small light clock of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107015473B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108919520B (en) * | 2018-06-21 | 2021-07-13 | 贵州民族大学 | Graphene ultra-narrow band electro-optic modulator |
| CN109270825B (en) * | 2018-10-12 | 2020-02-11 | 北京大学 | Dual-wavelength good-bad cavity active optical clock based on secondary cavity locking technology and implementation method thereof |
| CN110488594A (en) * | 2019-08-12 | 2019-11-22 | 浙江法拉第激光科技有限公司 | The small caesium clock of optical pumping and preparation method thereof based on Modulation Transfer spectrum Frequency Stabilized Lasers |
| CN110768097B (en) * | 2019-10-11 | 2020-12-08 | 温州激光与光电子协同创新中心 | Optical pumping rubidium atomic clock based on modulation transfer spectrum frequency stabilized laser and preparation method thereof |
| CN110928174B (en) * | 2019-12-17 | 2022-01-11 | 中国科学院国家授时中心 | Atomic clock frequency discrimination signal detection system |
| CN111244754B (en) * | 2020-01-22 | 2021-06-22 | 杭州电子科技大学 | Laser frequency stabilizing device and method based on sub-natural line width spectrum |
| CN112834056B (en) * | 2021-01-08 | 2022-10-28 | 中国船舶重工集团公司第七0七研究所 | Laser system for cold atom interferometer |
| CN113050404B (en) * | 2021-03-23 | 2022-07-19 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Rubidium atomic optical clock based on pulse modulation wide-spectrum multi-frequency laser and implementation method |
| CN114355753B (en) * | 2021-12-28 | 2024-03-29 | 北京无线电计量测试研究所 | Optical frequency atomic clock closed-loop locking state detection system |
| CN114755906B (en) * | 2022-05-05 | 2023-03-21 | 北京大学 | Atomic beam optical clock with external modulation locking applied to detection light and preparation method thereof |
| CN115061353B (en) * | 2022-07-04 | 2024-03-19 | 北京大学 | Fountain type optical clock and implementation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1848554B (en) * | 2004-04-05 | 2012-02-29 | Jds尤尼弗思公司 | Apparatus for emitting light with controllable degree of polarization |
| CN103606814A (en) * | 2013-11-13 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Laser frequency stabilization realization method |
| CN104953460A (en) * | 2015-06-05 | 2015-09-30 | 北京大学 | Two-photon atomic optical filter and optical signal filtering method implemented by aid of same |
| CN105866061A (en) * | 2016-03-31 | 2016-08-17 | 上海理工大学 | A differential pulse detecting apparatus for terahertz wave time domain information and a differential pulse detecting method |
-
2017
- 2017-03-28 CN CN201710192626.0A patent/CN107015473B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1848554B (en) * | 2004-04-05 | 2012-02-29 | Jds尤尼弗思公司 | Apparatus for emitting light with controllable degree of polarization |
| CN103606814A (en) * | 2013-11-13 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Laser frequency stabilization realization method |
| CN104953460A (en) * | 2015-06-05 | 2015-09-30 | 北京大学 | Two-photon atomic optical filter and optical signal filtering method implemented by aid of same |
| CN105866061A (en) * | 2016-03-31 | 2016-08-17 | 上海理工大学 | A differential pulse detecting apparatus for terahertz wave time domain information and a differential pulse detecting method |
Non-Patent Citations (2)
| Title |
|---|
| Frequency Stabilization of DBR Diode Laser Against Cs Absorption Lines at 852 nm Using the Modulation Transfer Method;Fabrizio Bertinetto;《IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》;20010430;第50卷(第2期);正文第490-492页、图1-5 |
| 铯原子调制转移光谱在激光稳频中的应用;刘涛，等;《光子学报》;20030125;第32卷(第1期);正文第5-7页、图1 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107015473A (en) | 2017-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107015473B (en) | A kind of small light clock of alkali metal and its control method based on Modulation Transfer spectrum frequency stabilization | |
| CN109270825B (en) | Dual-wavelength good-bad cavity active optical clock based on secondary cavity locking technology and implementation method thereof | |
| US10162021B2 (en) | Magnetic field measurement device | |
| CN110286577B (en) | Hyperfine energy level interval measuring device and method based on four-energy-level active optical clock | |
| JP5998214B2 (en) | Compact optical atomic clock and applications based on parametric nonlinear optical mixing in whispering gallery mode optical resonators | |
| US7323941B1 (en) | Method and system for operating a laser self-modulated at alkali-metal atom hyperfine frequency | |
| CN103606814A (en) | Laser frequency stabilization realization method | |
| CN104767119B (en) | Regulable center frequency humorous frequency stabilizing device of semiconductor laser and frequency-stabilizing method | |
| CN111208724B (en) | Chip active optical clock based on micro atomic gas chamber and implementation method thereof | |
| CN105244744B (en) | A kind of light comb system that the control of bandwidth carrier envelope offset frequency is realized using electro-optic crystal | |
| CN110488594A (en) | The small caesium clock of optical pumping and preparation method thereof based on Modulation Transfer spectrum Frequency Stabilized Lasers | |
| CA1303118C (en) | Wavelength stabilized light source | |
| KR101388727B1 (en) | Method and apparatus for ultralow phase noise microwave oscillation using femtosecond mode-locked laser and flywheel effect of phase-locked loop | |
| US3361990A (en) | Frequency stabilization apparatus for optical masers | |
| US5036278A (en) | Radiation source for helium magnetometers | |
| US20150116046A1 (en) | Optical module and atomic oscillator | |
| Li et al. | Frequency-octupled phase-coded signal generation based on carrier-suppressed high-order double sideband modulation | |
| JP2018032822A (en) | Frequency-stabilized laser | |
| Bi et al. | Ultra-narrow linewidth optical filter based on Faraday effect at isotope 87Rb 420 nm transitions | |
| CN112152079A (en) | Optical pumping small cesium clock for modulating transfer spectrum frequency stabilization DFB laser and implementation method | |
| CN115021050B (en) | THz radiation source and THz interval dual-wavelength Faraday laser | |
| RU2426226C1 (en) | Quantum frequency standard | |
| CN103178436A (en) | Supermode noise suppression method and device for active mode-locked lasers | |
| CN112013828A (en) | Nuclear magnetic resonance gyroscope with integrated pumping laser and atomic gas chamber | |
| CN114336277A (en) | Large-detuning frequency stabilizing device and method for laser with EOM sideband modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |