CN118073951A - Modulation transfer spectrum frequency stabilization device and method based on different wavelengths - Google Patents
Modulation transfer spectrum frequency stabilization device and method based on different wavelengths Download PDFInfo
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- 230000010287 polarization Effects 0.000 claims description 39
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- 238000005086 pumping Methods 0.000 claims description 11
- 238000001675 atomic spectrum Methods 0.000 claims 4
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- 229910052701 rubidium Inorganic materials 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/115—Q-switching using intracavity electro-optic devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0657—Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/0687—Stabilising the frequency of the laser
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Abstract
The application provides a modulation transfer spectrum frequency stabilization device and method based on different wavelengths, wherein the device comprises the following steps: the output end of the first wavelength laser is respectively connected with the first input end of the atomic gas chamber and the input end of the electro-optical modulator; the first output end of the atomic air chamber is connected with the input end of the first photoelectric detector; the output end of the electro-optic modulator is connected with the second input end of the atomic gas chamber; the output end of the first photoelectric detector is connected with the input end of the first servo circuit, and the output end of the first servo circuit is connected with the input end of the first wavelength laser; the output end of the second wavelength laser is connected with the first input end of the atomic gas chamber, and the first output end of the atomic gas chamber is connected with the input end of the second photoelectric detector; the output end of the second photoelectric detector is connected with the input end of the second servo circuit, and the output end of the second servo circuit is connected with the input end of the second wavelength laser. The method realizes that lasers with different wavelengths finish frequency stabilization based on the same atomic air chamber.
Description
Technical Field
The application relates to the technical fields of modulation transfer spectrum technology, laser frequency stabilization and atomic clocks, in particular to a device and a method for modulation transfer spectrum frequency stabilization based on different wavelengths.
Background
In experiments in the atomic domain, the interaction of laser light and atoms is an important field of current research, wherein the performance of a laser plays an important role in the field of quantum precision measurement, and the stability of the frequency of the laser seriously affects the experimental result.
In the atomic field at present, the laser frequency stabilization methods which are widely applied include saturated absorption spectrum frequency stabilization, modulation transfer spectrum frequency stabilization, PDH (Pound-Drever-Hall) frequency stabilization method and the like, which can be respectively applied to different experimental scenes, and the modulation transfer spectrum technology is to stabilize the frequency of the laser on a transition line corresponding to the atomic transition frequency and is the basic technology of laser frequency stabilization at present. The current modulation transfer spectrums for laser frequency stabilization are all for the same wavelength modulation transfer, the basic idea is to divide output laser into pumping light interacted with atoms and detection light for detecting atoms, wherein the pumping light generates sidebands after modulation of an electro-optical modulator and then interacts with the atoms, the modulation transfer spectrums of Doppler background can be obtained after modulation and demodulation by utilizing the detection light to detect the atoms, and the stabilization of laser wavelength can be completed through a servo feedback system.
However, the inventor finds that the single-wavelength modulation transfer spectrum frequency stabilization limits the application scene, and the laser frequency stabilization of the modulation transfer spectrum between different wavelengths cannot be realized.
Disclosure of Invention
The application provides a device and a method for stabilizing modulation transfer spectrum based on different wavelengths, which are used for solving the problem that the laser frequency stabilization of the modulation transfer spectrum between different wavelengths cannot be realized by the modulation transfer spectrum frequency stabilization of a single wavelength in the prior art.
In a first aspect, the present application provides a modulation transfer spectrum frequency stabilization device based on different wavelengths, including:
the device comprises a first wavelength laser, a second wavelength laser, an atomic gas chamber, an electro-optical modulator, a first photoelectric detector, a second photoelectric detector, a first servo circuit and a second servo circuit; the atomic gas chamber comprises a first input end, a first output end and a second input end;
The output end of the first wavelength laser is respectively connected with the first input end of the atomic gas chamber and the input end of the electro-optical modulator; the first output end of the atomic gas chamber is connected with the input end of the first photoelectric detector;
the output end of the electro-optic modulator is connected with the second input end of the atomic gas chamber;
The output end of the first photoelectric detector is connected with the input end of the first servo circuit, and the output end of the first servo circuit is connected with the input end of the first wavelength laser;
The output end of the second wavelength laser is connected with the first input end of the atomic gas chamber, and the first output end of the atomic gas chamber is connected with the input end of the second photoelectric detector;
the output end of the second photoelectric detector is connected with the input end of the second servo circuit, and the output end of the second servo circuit is connected with the input end of the second wavelength laser.
In one possible design, the atomic energy levels corresponding to the wavelengths of the first wavelength laser and the second wavelength laser are V-type energy levels, or the atomic energy levels corresponding to the wavelengths of the first wavelength laser and the second wavelength laser are cascade-type energy levels.
In one possible design, the resonant frequency of the electro-optic modulator satisfies the resonant frequency of the first wavelength to effect the modulation transfer while satisfying the resonant frequency of the modulation transfer between the first wavelength and the second wavelength.
In one possible design, the apparatus further comprises: a first polarization splitting prism; the first polarization splitting prism is arranged between the first wavelength laser and the atomic gas chamber; the first polarization splitting prism is used for splitting the laser signal emitted by the first wavelength laser into a first path of laser signal and a second path of laser signal, wherein the first path of laser signal is input into the electro-optical modulator, and the second path of laser signal is input into the atomic gas chamber.
In one possible design, the apparatus further comprises: a second polarization splitting prism; the second polarization splitting prism is arranged between the output end of the electro-optical modulator and the first wavelength reflection second wavelength transmission bicolor plate; the second polarization splitting prism is used for inputting the laser signal output by the electro-optical modulator into the atomic gas chamber.
In one possible design, the apparatus further comprises: the first wavelength reflects the second wavelength transmits the bi-color plate; the first wavelength reflection second wavelength transmission bicolor sheet is arranged between the second input end of the atomic gas chamber and the second photoelectric detector; the first wavelength reflection second wavelength transmission bicolor sheet is used for reflecting the laser signals of the first wavelength output by the first wavelength laser and transmitting the laser signals of the second wavelength output by the second wavelength laser.
In a second aspect, the present application provides a method for stabilizing a modulation transfer spectrum based on different wavelengths, which is applied to the device for stabilizing a modulation transfer spectrum based on different wavelengths in the first aspect, and includes:
The first wavelength laser outputs a first wavelength laser signal, wherein the first wavelength laser signal is divided into a first path of first wavelength laser signal and a second path of first wavelength laser signal through the first polarization splitting prism; the electro-optical modulator receives a first path of first wavelength laser signals, and modulates the first path of first wavelength laser signals to output pumping light signals; the atomic gas chamber receives the pump light signal, wherein the pump light signal interacts with atoms in the atomic gas chamber to obtain atoms interacted with the pump light signal; the atomic gas chamber receives the second path of first wavelength laser signals and outputs first detection light signals; the second path of first wavelength laser signals are used as detection light to detect atoms after the pump light signals interact in the atomic gas chamber; the first photoelectric detector receives the first detection light signal; the first photoelectric detector outputs a first atomic spectral line, and the first wavelength laser completes locking of the first wavelength laser through feedback of the first servo circuit;
The second wavelength laser outputs a second wavelength laser signal, the atomic gas chamber receives the second wavelength laser signal and outputs a second detection light signal, wherein the second wavelength laser signal is used as detection light to detect atoms after the pump light signals interact in the atomic gas chamber; the second photoelectric detector receives the second detection light signal; and the second photoelectric detector outputs a second atomic spectral line, and the second wavelength laser completes the locking of the second wavelength laser through the feedback of the second servo circuit.
In one possible design, the modulation transfer spectrum frequency stabilization device based on the different wavelengths further includes: a first wavelength reflective second wavelength transmissive dichroic plate and a second polarization splitting prism; accordingly, the atomic gas chamber receives the pump light signal, comprising: the atomic gas chamber receives the pump light signals reflected by the second polarization splitting prism through the second input end and then reflected by the second wavelength transmission bicolor sheet through the first wavelength reflection.
In one possible design, the first photodetector receives the first detection light signal, including: the first photoelectric detector receives the first detection light signal reflected by the first wavelength reflection second wavelength transmission bicolor sheet.
In one possible design, the second photodetector receives the second detection light signal, including: the second photodetector receives the second detection light signal transmitted by the first wavelength reflective second wavelength transmissive dichroic plate.
According to the modulation transfer spectrum frequency stabilization device and method based on different wavelengths, one path of first wavelength laser output by the first wavelength laser is modulated through the electro-optical modulator, and the modulated laser enters an atomic air chamber as pump light to react with atoms; the other path of first wavelength laser is used as detection light to enter atoms after the atomic gas chamber detection and pump light reaction, atomic spectral lines with high signal to noise ratio are obtained and then fed back to the first wavelength laser through the first servo circuit to finish locking, the second wavelength laser output by the second wavelength laser enters atoms after the atomic gas chamber detection and pump light reaction, high signal to noise ratio spectral lines modulated and transferred among different wavelengths are obtained, and then fed back to the second wavelength laser through the second servo circuit to finish locking, so that the frequency stabilization of the two lasers with different wavelengths is realized based on the same atomic gas chamber.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the application, 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 structural diagram of a frequency stabilizing device based on modulation transfer spectrum between different wavelengths according to an embodiment of the present application;
Fig. 2 is a diagram of rubidium atomic energy levels provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a frequency stabilizing device for modulation transfer spectrum between 780nm and 795nm according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of a modulation transfer spectrum frequency stabilization device between 780nm and 1529nm according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In experiments in the atomic domain, the interaction of laser light and atoms is an important field of current research, wherein the performance of a laser plays an important role in the field of quantum precision measurement, and the stability of the frequency of the laser seriously affects the experimental result. In the atomic field at present, the laser frequency stabilization method which is widely applied comprises a saturated absorption spectrum frequency stabilization method, a modulation transfer spectrum frequency stabilization method, a PDH frequency stabilization method and the like, which can be respectively applied to different experimental scenes, and the modulation transfer spectrum technology is used for stabilizing the frequency of a laser on a transition line corresponding to the atomic transition frequency and is the basic technology of laser frequency stabilization at present. The current modulation transfer spectrums for laser frequency stabilization are all for the same wavelength modulation transfer, the basic idea is to divide output laser into pumping light interacted with atoms and detection light for detecting atoms, wherein the pumping light generates sidebands after modulation of an electro-optical modulator and then interacts with the atoms, the modulation transfer spectrums of Doppler background can be obtained after modulation and demodulation by utilizing the detection light to detect the atoms, and the stabilization of laser wavelength can be completed through a servo feedback system. However, the laser frequency stabilization of the modulation transfer spectrum between different wavelengths cannot be realized due to the frequency stabilization of the modulation transfer spectrum of a single wavelength, so that the application scene is limited, for example, the chip-level optical clock based on the modulation transfer spectrum has the limitation of the chip due to the complexity of the structure and the volume thereof; and some special wavelengths such as 1529nm and the like have no method for directly utilizing a modulation transfer spectrum method to conduct frequency stabilization.
In order to solve the above technical problems, the embodiments of the present invention provide the following inventive concepts: the laser with the first wavelength is used as the pumping light after the frequency stabilization is completed through the standard modulation transfer spectrum, and the laser with the second wavelength is used as the detection light to detect the atoms after the action of the pumping light, so that the lasers with two different wavelengths can be locked on the same atomic air chamber to complete the frequency stabilization.
The technical scheme of the present application will be described in detail with specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 is a schematic structural diagram of a device for stabilizing a modulation transfer spectrum based on different wavelengths according to an embodiment of the present application, for convenience of explanation, only relevant portions of the present application are shown, and referring to fig. 1, the device for stabilizing a modulation transfer spectrum based on different wavelengths includes:
A first wavelength laser 101, a second wavelength laser 102, an atomic gas cell 103, an electro-optic modulator 104, a first photodetector 105, a second photodetector 106, a first servo circuit 107, and a second servo circuit 108; the atomic gas chamber 103 includes a first input, a first output, and a second input.
Wherein the output end of the first wavelength laser 101 is respectively connected with the first input end of the atomic gas chamber 103 and the input end of the electro-optical modulator 104; a first output end of the atomic gas chamber 103 is connected with an input end of the first photodetector 105;
An output end of the electro-optical modulator 104 is connected with a second input end of the atomic gas chamber 103;
The output end of the first photodetector 105 is connected with the input end of the first servo circuit 107, and the output end of the first servo circuit 107 is connected with the input end of the first wavelength laser 101;
the output end of the second wavelength laser 102 is connected with the input end of the atomic gas chamber 103;
the output end of the second wavelength laser 102 is connected with the first input end of the atomic gas chamber 103, and the first output end of the atomic gas chamber 103 is connected with the input end of the second photoelectric detector 106;
the output of the second photodetector 106 is connected to the input of the second servo circuit 108, and the output of the second servo circuit 108 is connected to the input of the second wavelength laser 102.
The first wavelength laser 101, the atomic gas chamber 103, the electro-optical modulator 104 and the first photodetector 105 are connected by an optical path. Similarly, the second wavelength laser 102, the atomic gas chamber 103 and the second photodetector 106 are also connected by an optical path. The laser signal output by the first wavelength laser 101 is processed, enters the first photodetector 105, is converted into an electrical signal, and is output, and the electrical signal is sent to the first wavelength laser 101 through the first servo circuit 107, so that the first photodetector 105, the first servo circuit 107 and the first wavelength laser 101 are in circuit connection. Similarly, the second photodetector 106, the second servo circuit 108, and the second wavelength laser 102 are also electrically connected.
In this embodiment, the first wavelength laser and the second wavelength laser are V-shaped energy level lasers, or the first wavelength laser and the second wavelength laser are cascade-type energy level lasers.
In particular, for a particular example of a type of V-type level laser, the modulation shift between the two wavelengths 780nm and 795nm is included in the present invention, but is not limited to, the two wavelengths 780nm and 795 nm. A particular example of a cascade type of energy level laser is the shift of modulation between two different wavelengths 780nm and 1529nm, which includes but is not limited to 780nm and 1529 nm.
In this embodiment, the resonant frequency of the electro-optical modulator satisfies the resonant frequency of the first wavelength for modulation transfer, and satisfies the resonant frequency of the modulation transfer between the first wavelength and the second wavelength.
In particular, electro-optic modulators are modulators made using the electro-optic effect of certain electro-optic crystals. The electro-optic effect is that when a voltage is applied to the electro-optic crystal, the refractive index of the electro-optic crystal will change, resulting in a change in the characteristics of the light wave passing through the crystal, effecting modulation of the phase, amplitude, intensity and polarization state of the light signal.
In this embodiment, the modulation transfer spectrum frequency stabilization device based on different wavelengths further includes: a first polarization splitting prism 109.
Wherein the first polarization splitting prism 109 is disposed between the first wavelength laser 101 and the atomic gas cell 103.
The first polarization splitting prism 109 is configured to split the laser signal emitted by the first wavelength laser 101 into a first path of first wavelength laser signal and a second path of first wavelength laser signal, where the first path of first wavelength laser signal is input to the electro-optical modulator 104, and the second path of first wavelength laser signal is input to the atomic gas chamber 103.
Specifically, the modulation transfer spectrum frequency stabilization device based on different wavelengths further comprises: the first reflection sheet 112. The first wavelength laser 101 outputs a first wavelength laser signal through the output end, and the first wavelength laser signal is split into horizontal polarized light and vertical polarized light through the first polarization splitting prism 109, wherein the vertical polarized light is a second path of first wavelength laser signal, and the second path of first wavelength laser signal enters the electro-optical modulator 104 after being reflected by the first reflecting sheet 112. The horizontally polarized light, i.e., the second path of the first wavelength laser signal, is input into the atomic gas cell 103.
In this embodiment, the modulation transfer spectrum frequency stabilization device based on different wavelengths further includes: a second polarization splitting prism 110.
Wherein a second polarization splitting prism 110 is arranged between the output of the electro-optical modulator 104 and the atomic gas cell 103.
The second polarization splitting prism is used for inputting the laser signal output by the electro-optical modulator 104 into the atomic gas chamber 103.
In this embodiment, the atoms in the atomic gas chamber 103 are rubidium atoms. Fig. 2 is a diagram of a rubidium atomic energy level provided by the embodiment of the present application, as shown in fig. 2, where fig. (a) is a D1 line and a D2 line, in which the V-type energy level structure includes atoms, and fig. (b) is a cascade type energy level structure.
The second input end and the first output end of the atomic gas chamber 103 are arranged on the same side of the atomic gas chamber, and the first input end is arranged on the other side.
In this embodiment, the modulation transfer spectrum frequency stabilization device based on different wavelengths further includes: the first wavelength reflects the second wavelength transmits the dichroic sheet 111.
Wherein a first wavelength reflective second wavelength transmissive dichroic plate 111 is arranged between the second input end of the atomic gas cell 103 and the second photodetector 106. The first wavelength reflective second wavelength transmissive dichroic sheet 111 is configured to reflect the first wavelength laser signal output by the first wavelength laser 101 and transmit the second wavelength laser signal output by the second wavelength laser 102.
Specifically, the second wavelength laser signal output by the second wavelength laser 102 passes through the atomic gas cell 103 and then is transmitted from the first wavelength reflective second wavelength transmissive dichroic plate 111 into the second photodetector 106. The first wavelength laser signal output by the first wavelength laser 101 passes through the electro-optical modulator 104, and then is reflected from the first wavelength reflective second wavelength transmissive dichroic sheet 111 into the atomic gas cell 103.
In this embodiment, the first servo circuit 107 and the second servo circuit 108 may be separate circuit devices or may be integrated units.
The working flow of the modulation transfer spectrum frequency stabilization device based on different wavelengths provided by the embodiment of the application is as follows:
1) The first wavelength laser signal output by the first wavelength laser 101 is split into two paths after passing through the first polarization splitting prism 108: vertically polarized light (i.e., the second path of the first wavelength laser signal) and horizontally polarized light (i.e., the first path of the first wavelength laser signal).
The vertically polarized light is reflected by the first reflective sheet 112 and then enters the electro-optical modulator 104 from the horizontal direction for modulation. The modulated laser signal is output by the electro-optical modulator 104, is converted from the horizontal direction to the vertical direction by the second polarization splitting prism 109, is reflected by the first wavelength reflective second wavelength transmissive dichroic plate 111, and horizontally enters the atomic gas chamber 103 to interact with atoms in the atomic gas chamber 103 as pump light. The polarized light in the horizontal direction enters the atomic gas chamber 103 and is used as detection light to detect atoms in the atomic gas chamber 103 after reacting with the pumping light, the atoms are reflected by the first wavelength reflection second wavelength transmission bicolor sheet 111 and then converted into the vertical direction from the horizontal direction, the vertical direction passes through the second polarization splitting prism 110 and then enters the first photoelectric detector 105, the first photoelectric detector 105 processes laser signals to obtain modulation transfer spectral lines with high signal to noise ratio, and the locking of the first wavelength laser is completed after the modulation transfer spectral lines with high signal to noise ratio are fed back to the first wavelength laser 101 through the first servo circuit 107.
2) A second wavelength laser with modulation transfer spectrum stable frequency between different wavelengths is utilized: the pump light with the first wavelength laser frequency stabilization in the step 1) is still used as pump light; the second wavelength laser signal output by the second wavelength laser 102 is converted into a vertical direction from a horizontal direction after being reflected by the second reflecting sheet 113, and enters the atomic gas chamber 103 after being reflected by the first polarization splitting prism 109, the second wavelength laser signal output by the second wavelength laser 102 is used as another path of detection light to detect atoms in the atomic gas chamber 103 after reacting with the pump light, the detected second wavelength laser signal enters the second photoelectric detector 106 after being transmitted by the first wavelength reflecting second wavelength transmitting bicolor 110, the second photoelectric detector 106 processes the laser signal to obtain a spectral line with high signal to noise ratio, and the spectral line with high signal to noise ratio is fed back to the second wavelength laser 102 through the second servo circuit 108 to complete frequency stabilization of the second wavelength laser. Thus, the laser of the first wavelength and the second wavelength is locked on the same atomic gas chamber.
In summary, according to the modulation transfer spectrum frequency stabilization device based on different wavelengths, one path of first wavelength laser output by the first wavelength laser is modulated through the electro-optical modulator, and the modulated laser enters an atomic air chamber as pump light to react with atoms; the other path of first wavelength laser is used as detection light to enter atoms after the atomic gas chamber detection and pump light reaction, atomic spectral lines with high signal to noise ratio are obtained and then fed back to the first wavelength laser through the first servo circuit to finish locking, the second wavelength laser output by the second wavelength laser enters atoms after the atomic gas chamber detection and pump light reaction, modulation transfer high signal to noise ratio spectral lines among different wavelengths are obtained, and then the second wavelength laser is fed back through the second servo circuit to finish locking, so that the frequency stabilization of the two lasers with different wavelengths is realized based on the same atomic gas chamber.
Fig. 3 is a schematic structural diagram of a frequency stabilizing device for modulation transfer spectrum between 780nm and 795nm according to an embodiment of the present application. Referring to fig. 3, the modulation transfer spectrum frequency stabilization device between 780nm and 795nm includes: 780nm laser 101, 795nm laser 102, atomic gas cell 103, electro-optic modulator 104, first photodetector 105, second photodetector 106, first and second servo circuits 107 and 108, first polarization splitting prism 109, second polarization splitting prism 110, 780nm reflection 795nm transmission dichroic sheet 111, first reflection sheet 112, and second reflection sheet 113. The atomic gas chamber 103 includes a first input, a first output, and a second input.
The output end of the 780nm laser 101 is respectively connected with the first input end of the atomic gas chamber 103 and the input end of the electro-optical modulator 104; a first output of the atomic gas cell 103 is connected to an input of a first photodetector 105.
An output of the electro-optic modulator 104 is connected to a second input of the atomic gas cell 103.
The output of the first photodetector 105 is connected to the input of the first servo circuit 107, and the output of the first servo circuit 107 is connected to the input of the 780nm laser 101.
The output of 795nm laser 102 is connected to the input of atomic gas chamber 103.
The output of the 795nm laser 102 is connected to a first input of the atomic gas chamber 103, and the first output of the atomic gas chamber 103 is connected to an input of the second photodetector 106.
The output of the second photodetector 106 is connected to the input of the second servo circuit 108, and the output of the second servo circuit 108 is connected to the input of the 795nm laser 102.
In summary, according to the 780 nm-795 nm modulation transfer spectrum frequency stabilization device provided by the application, one path of 780nm laser output by the 780nm laser is modulated through the electro-optic modulator, and the modulated laser enters an atomic air chamber as pump light to react with atoms; the other path of 780nm laser is used as detection light to enter atoms after the atomic gas chamber detection and pump light reaction, atomic spectral lines with high signal to noise ratio are obtained and fed back to the 780nm laser through a first servo circuit to finish locking, second wavelength laser output by the 795nm laser enters atoms after the atomic gas chamber detection and pump light reaction, modulation transfer spectrum high signal to noise ratio spectral lines among different wavelengths are obtained, and then the second servo circuit feeds back to the 795nm laser to finish locking, so that the frequency stabilization of the laser with the V-shaped energy level structure 780nm and 795nm is realized based on the same atomic gas chamber.
Fig. 4 is a schematic structural diagram of a modulation transfer spectrum frequency stabilization device between 780nm and 1529nm according to an embodiment of the present application. Referring to fig. 4, the modulation transfer spectrum frequency stabilization device between 780nm and 1529nm includes:
780nm laser 101, 1529nm laser 102, atomic gas cell 103, electro-optic modulator 104, first photodetector 105, second photodetector 106, first and second servo circuits 107 and 108, first polarization splitting prism 109, second polarization splitting prism 110, 780nm reflection 1529nm transmission dichroic sheet 111, first reflection sheet 112, and second reflection sheet 113. The atomic gas chamber 103 includes a first input, a first output, and a second input.
The output end of the 780nm laser 101 is respectively connected with the first input end of the atomic gas chamber 103 and the input end of the electro-optical modulator 104; a first output of the atomic gas cell 103 is connected to an input of a first photodetector 105.
An output of the electro-optic modulator 104 is connected to a second input of the atomic gas cell 103.
The output of the first photodetector 105 is connected to the input of the first servo circuit 107, and the output of the first servo circuit 107 is connected to the input of the 780nm laser 101.
The output of the 1529nm laser 102 is connected to the input of the atomic gas chamber 103.
The output of the 1529nm laser 102 is connected to a first input of the atomic gas chamber 103, and the first output of the atomic gas chamber 103 is connected to the input of the second photodetector 106.
The output of the second photodetector 106 is connected to the input of the second servo circuit 107, and the output of the second servo circuit 107 is connected to the input of the 1529nm laser 102.
In summary, according to the 780 nm-1529 nm modulation transfer spectrum frequency stabilization device provided by the application, one path of 780nm laser output by the 780nm laser is modulated through the electro-optical modulator, and the modulated laser enters an atomic gas chamber as pump light to react with atoms; the other path of 780nm laser is used as detection light to enter atoms after the atomic gas chamber detection and pump light reaction, atomic spectral lines with high signal to noise ratio are obtained and fed back to the 780nm laser through a first servo circuit to finish locking, second wavelength laser output by the 1529nm laser enters atoms after the atomic gas chamber detection and pump light reaction, high signal to noise ratio spectral lines among different wavelengths are obtained, and then the second servo circuit feeds back to the 1529nm laser to finish locking, so that the frequency stabilization of the laser with the cascade-type energy level structure 780nm and 1529nm is realized based on the same atomic gas chamber.
The embodiment of the application also provides a modulation transfer spectrum frequency stabilization method based on different wavelengths, which is applied to the modulation transfer spectrum frequency stabilization device based on different wavelengths in the embodiment of the application, and comprises the following steps:
The first wavelength laser 101 outputs a first wavelength laser signal, where the first wavelength laser signal is split into a first path of first wavelength laser signal and a second path of first wavelength laser signal by the first polarization splitting prism 109; the electro-optical modulator 104 receives the first path of first wavelength laser signals, and modulates the first path of first wavelength laser signals to output pumping light signals; the atomic gas chamber 103 receives a pump light signal, wherein the pump light signal interacts with atoms in the atomic gas chamber to obtain atoms interacted with the pump light signal; the atomic gas chamber 103 receives the second path of the first wavelength laser signal and outputs a first detection optical signal; the second path of first wavelength laser signals are used as detection light to detect atoms after the interaction of pumping light signals in the atomic gas chamber; the first photodetector 105 receives the first detection light signal; the first photodetector outputs a first atomic line, and the first wavelength laser 101 completes the locking of the first wavelength laser through the first servo circuit 107.
The second wavelength laser 102 outputs a second wavelength laser signal, the atomic gas chamber 103 receives the second wavelength laser signal and outputs a second detection light signal, wherein the second wavelength laser signal is used as the detection light to detect atoms after the pump light signals interact in the atomic gas chamber 103; the second photodetector 106 receives the second detection light signal; the second photodetector 106 outputs a second atomic line and the second wavelength laser 102 completes the locking of the second wavelength laser through the second servo circuit 108.
As an optional embodiment of the present application, the frequency stabilizing device based on modulation transfer spectrum between different wavelengths further includes: a first wavelength reflective second wavelength transmissive dichroic plate 111 and a second polarization splitting prism 110;
accordingly, the atomic gas cell 103 receives the pump light signal, including:
The atomic gas chamber 103 receives the pump light signal reflected by the second polarization splitting prism 110 through the second input end, and then reflects the pump light signal reflected by the second wavelength transmission dichroic sheet 111 through the first wavelength.
Specifically, the electro-optical modulator 104 receives a first path of first wavelength laser signal, the first path of first wavelength laser signal is modulated by the electro-optical modulator and then used as pump light, the pump light is reflected by the second polarization splitting prism 110, is converted into a vertical direction from a horizontal direction, is reflected by the first wavelength reflective second wavelength transmissive dichroic plate 111, is converted into a horizontal direction from a vertical direction, and enters the atomic gas chamber 103.
As an alternative embodiment of the present application, the first photodetector receives a first detection light signal, including:
The first photodetector 105 receives the first detection light signal reflected by the first wavelength reflective second wavelength transmissive dichroic plate 111.
Specifically, the atomic gas chamber 103 receives the second path of the first wavelength laser signal, outputs a first detection light signal, and the first detection light signal is reflected by the first wavelength reflective second wavelength transmissive dichroic plate 111, is converted from a horizontal direction to a vertical direction, passes through the second polarization splitting prism 110, and enters the first photodetector 105.
As an alternative embodiment of the present application, the second photodetector 106 receives a second detection light signal, including:
The second photodetector 106 receives the second detection light signal transmitted through the first wavelength reflective second wavelength transmissive dichroic plate 111.
Specifically, the second wavelength laser signal output by the second wavelength laser 102 is used as the detection light to detect the atoms in the atom chamber 103 after the atoms react with the pump light, and the detected second wavelength laser signal is transmitted by the first wavelength reflective second wavelength transmissive dichroic plate 110 and then enters the second photodetector 106.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same. Although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents. Such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A modulation transfer spectrum frequency stabilization device based on different wavelengths, comprising:
the device comprises a first wavelength laser, a second wavelength laser, an atomic gas chamber, an electro-optical modulator, a first photoelectric detector, a second photoelectric detector, a first servo circuit and a second servo circuit; the atomic gas chamber comprises a first input end, a first output end and a second input end;
The output end of the first wavelength laser is respectively connected with the first input end of the atomic gas chamber and the input end of the electro-optical modulator; the first output end of the atomic gas chamber is connected with the input end of the first photoelectric detector;
the output end of the electro-optic modulator is connected with the second input end of the atomic gas chamber;
The output end of the first photoelectric detector is connected with the input end of the first servo circuit, and the output end of the first servo circuit is connected with the input end of the first wavelength laser;
The output end of the second wavelength laser is connected with the first input end of the atomic gas chamber, and the first output end of the atomic gas chamber is connected with the input end of the second photoelectric detector;
the output end of the second photoelectric detector is connected with the input end of the second servo circuit, and the output end of the second servo circuit is connected with the input end of the second wavelength laser.
2. The apparatus of claim 1, wherein the first and second wavelength lasers have a V-type energy level at their wavelengths or a cascade-type energy level at their wavelengths.
3. The apparatus of claim 1, wherein the resonant frequency of the electro-optic modulator satisfies a resonant frequency of the first wavelength at which the modulation transfer is effected, while satisfying a resonant frequency of the modulation transfer between the first wavelength and the second wavelength.
4. The apparatus as recited in claim 1, further comprising: a first polarization splitting prism;
The first polarization splitting prism is arranged between the first wavelength laser and the atomic gas chamber;
The first polarization splitting prism is used for splitting the laser signals emitted by the first wavelength laser into a first path of first wavelength laser signals and a second path of first wavelength laser signals, wherein the first path of first wavelength laser signals are input into the electro-optical modulator, and the second path of first wavelength laser signals are input into the atomic gas chamber.
5. The apparatus as recited in claim 1, further comprising: a second polarization splitting prism;
the second polarization splitting prism is arranged between the output end of the electro-optical modulator and the atomic air chamber;
the second polarization splitting prism is used for inputting the laser signal output by the electro-optical modulator into the atomic gas chamber.
6. The apparatus according to any one of claims 1 to 5, further comprising: the first wavelength reflects the second wavelength transmits the bi-color plate;
the first wavelength reflection second wavelength transmission bicolor sheet is arranged between the second input end of the atomic gas chamber and the second photoelectric detector;
the first wavelength reflection second wavelength transmission bicolor sheet is used for reflecting a first wavelength laser signal output by the first wavelength laser and transmitting a second wavelength laser signal output by the second wavelength laser.
7. A method for stabilizing a modulation transfer spectrum based on different wavelengths, which is applied to the modulation transfer spectrum stabilizing device based on different wavelengths according to any one of claims 1 to 6, and comprises the following steps:
The first wavelength laser outputs a first wavelength laser signal, wherein the first wavelength laser signal is divided into a first path of first wavelength laser signal and a second path of first wavelength laser signal through the first polarization splitting prism; the electro-optical modulator receives a first path of first wavelength laser signals, and modulates the first path of first wavelength laser signals to output pumping light signals; the atomic gas chamber receives the pump light signal, wherein the pump light signal interacts with atoms in the atomic gas chamber to obtain atoms interacted with the pump light signal; the atomic gas chamber receives the second path of first wavelength laser signals and outputs first detection light signals; the second path of first wavelength laser signals are used as detection light to detect atoms after the pump light signals interact in the atomic gas chamber; the first photoelectric detector receives the first detection light signal; the first photoelectric detector outputs a first atomic spectrum line, and the first wavelength laser receives the first atomic spectrum line through the first servo circuit to finish locking of first wavelength laser;
The second wavelength laser outputs a second wavelength laser signal, the atomic gas chamber receives the second wavelength laser signal and outputs a second detection light signal, wherein the second wavelength laser signal is used as detection light to detect atoms after the pump light signals interact in the atomic gas chamber; the second photoelectric detector receives the second detection light signal; and the second photoelectric detector outputs a second atomic spectrum line, and the second wavelength laser receives the second atomic spectrum line through the second servo circuit to finish locking of the second wavelength laser.
8. The method of claim 7, wherein the modulation transfer spectrum frequency stabilization device based on the different wavelengths further comprises: a first wavelength reflective second wavelength transmissive dichroic plate and a second polarization splitting prism;
accordingly, the atomic gas chamber receives the pump light signal, comprising:
the atomic gas chamber receives the pump light signals reflected by the second polarization splitting prism through the second input end and then reflected by the second wavelength transmission bicolor sheet through the first wavelength reflection.
9. The method of claim 8, wherein the first photodetector receiving the first detection light signal comprises:
The first photoelectric detector receives the first detection light signal reflected by the first wavelength reflection second wavelength transmission bicolor sheet.
10. The method of claim 8, wherein the second photodetector receiving the second detection light signal comprises:
The second photodetector receives the second detection light signal transmitted by the first wavelength reflective second wavelength transmissive dichroic plate.
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