CN217009885U - Device for realizing laser frequency stabilization by utilizing double-path atomic polarization spectral line - Google Patents
Device for realizing laser frequency stabilization by utilizing double-path atomic polarization spectral line Download PDFInfo
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- CN217009885U CN217009885U CN202220919319.4U CN202220919319U CN217009885U CN 217009885 U CN217009885 U CN 217009885U CN 202220919319 U CN202220919319 U CN 202220919319U CN 217009885 U CN217009885 U CN 217009885U
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Abstract
The utility model discloses a device for realizing laser frequency stabilization by utilizing double-path atomic polarization spectral lines, which comprises a laser to be frequency stabilized, a frequency stabilized laser, a first depolarization beam splitter, a second depolarization beam splitter, a first reflector, a second reflector, a third reflector, a fourth reflector, a first atomic gas chamber, a second atomic gas chamber, a first polarization beam splitter, a second polarization beam splitter, a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a fourth photoelectric detector, a logic circuit module, a first light barrier and a second light barrier. The utility model provides an absolute frequency locking function of atomic spectral line locking, the locking frequency does not depend on the environment, the atomic spectral line locking can automatically recover high-precision locking after the environment is recovered, and the production cost is reduced.
Description
Technical Field
The utility model is suitable for the field of laser frequency stabilization, and particularly relates to a device for realizing laser frequency stabilization by utilizing a double-path atomic polarization spectral line. The method is suitable for the field of laser automatic recovery high-precision frequency locking in the interference environment.
Background
With the development of laser technology, lasers have been widely used in many fields, especially in the field of interaction between light and atoms. In many experiments of interaction between light and atoms, such as light speed reduction, optical magnetometer, optical coherence measurement, atomic clock and the like, the laser frequency locking has higher precision requirement, the experiment requires that the long-term drift of the laser frequency is less than 1MHz/h, and meanwhile, the laser frequency locking has strong anti-interference capability on the environment, namely, the locking can be automatically recovered after the interference environment disappears.
Generally, the frequency stabilization reference of the laser frequency can be divided into two types, an atomic line and an optical cavity length. For example, we can lock the laser frequency to the energy level transition of atoms using techniques such as Saturated Absorption Spectroscopy (SAS), electromagnetic induced transparent spectroscopy (EIT), and Polarization Spectroscopy (PS). The frequency locking method can provide an absolute frequency standard, but the locking rate method cannot automatically restore the locking state of the laser when the external environment is greatly disturbed. In addition, we can also use the Pound-Drever-Hall (pdh) frequency stabilization method to stabilize the laser frequency to the formant of the fabry-perot optical cavity, as in the literature (e.d. black, An interaction to Pound-Drever-Hall laser frequency stabilization, Am J Phys,69(2001) 79-87). The PDH laser frequency stabilization method is a technology widely adopted in a narrow-linewidth ultrastable laser, and has the advantages of high frequency accuracy, strong anti-interference capability and the like. However, the PDH laser frequency stabilization method requires a phase modulation crystal such as an electro-optical modulator (EOM) to modulate the laser frequency, the phase modulation crystal being driven by a local oscillator to generate corresponding phase modulation sidebands, and an analog phase shifter or a digital phase shifter to compensate for the phase difference between the local oscillator signal and the output signal of the photodetector. These fittings are expensive and add to the cost of the laser frequency stabilization system. Meanwhile, the long-term stability of the locking frequency of the super-cavity is dependent on the temperature drift of the super-cavity, and absolute frequency reference value is not available.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art and provides a device for realizing laser frequency stabilization by utilizing double-path atomic polarization spectral lines. The method has the advantages of long-term stability of atomic spectrum locking, wide dynamic range recovery function of PDH frequency locking, increased grabbing range of laser locking frequency while ensuring high accuracy of laser frequency locking, similar function and advantage of PDH frequency locking, and strong anti-interference capability. The frequency locking technology in the utility model does not need to modulate the laser frequency or use an ultra-stable optical cavity as the frequency reference, thereby simplifying the circuit and saving the cost. The utility model can be widely used in the fields of precision measurement, atomic clocks, quantum information and the like which need high-precision and high-stability locking of laser frequency.
The purpose of the utility model is realized by the following steps:
a device for realizing laser frequency stabilization by utilizing two-way atomic polarization spectral line comprises a stabilized frequency laser and a to-be-stabilized frequency laser, wherein an outgoing beam of the to-be-stabilized frequency laser is divided into a first beam and a second beam by a first depolarization beam splitter, the first beam is reflected by a first reflector, penetrates through a first atomic gas chamber and is split into two beams by the first depolarization beam splitter, the second beam is reflected by a second reflector, penetrates through a second atomic gas chamber and is split into two beams by the second depolarization beam splitter,
the light beam emitted from the stabilized frequency laser is split into a third light beam and a fourth light beam by a second depolarizing beam splitter, the third light beam is reflected by a third reflector, then is superposed with the first light beam in a first atomic gas chamber, reversely passes through the first atomic gas chamber and then is shielded by a first light barrier, the fourth light beam is reflected by a fourth reflector, then is superposed with the second light beam in a second atomic gas chamber, reversely passes through a second atomic gas chamber and then is shielded by a second light barrier,
the first atomic gas cell does not apply a magnetic field, the second atomic gas cell applies a magnetic field,
two beams of light obtained after beam splitting by the first polarization beam splitter are respectively measured by the first photoelectric detector and the second photoelectric detector; two beams obtained by beam splitting of the second polarization beam splitter are respectively measured by a third photoelectric detector and a fourth photoelectric detector; the first photoelectric detector, the second photoelectric detector, the third photoelectric detector and the fourth photoelectric detector are all connected with the logic circuit module, and the logic circuit module is connected with the laser to be stabilized.
The logic circuit module comprises a first subtraction circuit, a second subtraction circuit and an addition circuit, wherein two input ends of the first subtraction circuit are respectively connected with output signals of the first photoelectric detector and the second photoelectric detector, two input ends of the second subtraction circuit are respectively connected with output signals of the third photoelectric detector and the fourth photoelectric detector, an input end of the addition circuit is respectively connected with an output end of the first subtraction circuit and an output end of the second subtraction circuit, and an output end of the addition circuit is connected with the laser to be stabilized.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model constructs two paths of atom polarized light, one path applies a magnetic field, the other path does not apply the magnetic field, a photoelectric detector is used for carrying out differential detection, and a logic circuit module is used for carrying out superposition combination on a magnetic field electromagnetic induction transparent optical signal and a non-magnetic field electromagnetic induction transparent optical signal to construct a non-modulation dual-path laser frequency stabilization error signal. The utility model can obtain the error locking signal without modulation.
2. The utility model provides an absolute frequency locking function of atomic spectral line locking, and the locking frequency is independent of the environment.
3. The utility model provides an atomic spectral line unlocking automatic recovery function under environmental noise disturbance, and realizes automatic recovery of atomic spectral line locking and high-precision locking after environmental recovery.
4. The utility model solves the defects of complex circuit and the like of the traditional PDH laser frequency stabilizing device and reduces the production cost.
Drawings
FIG. 1 is a schematic diagram of the operation of the present invention;
wherein:
111-a laser to be frequency stabilized, 112-a frequency stabilized laser;
121-a first depolarizing beam splitter, 122-a second depolarizing beam splitter;
131-first mirror, 132-second mirror, 133-third mirror, 134-fourth mirror;
141-first atomic cell, 142-second atomic cell;
151-first polarizing beam splitter, 152-second polarizing beam splitter;
161-first photodetector, 162-second photodetector, 163-third photodetector, 164-fourth photodetector;
17-a logic circuit module;
181-a first light barrier, 182-a second light barrier;
fig. 2 is a schematic diagram of a non-modulation dual-optical-path laser frequency stabilization error signal.
Fig. 3 is the relative frequency stability of two lasers after locking by the present invention and the electronic response of laser frequency stabilization under external environmental disturbance.
Detailed Description
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the utility model by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
As shown in fig. 1, an apparatus for achieving laser frequency stabilization by using two-way atomic polarization spectral line includes a laser 111 to be frequency stabilized and a laser 112 having been frequency stabilized, an outgoing light beam of the laser 111 to be frequency stabilized is divided into a first light beam and a second light beam by a first depolarizing beam splitter 121, the first light beam is reflected by a first reflector 131, passes through a first atomic gas chamber 141, and is split into two light beams by a first polarization beam splitter 151, and the second light beam is reflected by a second reflector 132, passes through a second atomic gas chamber 142, and is split into two light beams by a second polarization beam splitter 152.
The light beam emitted from the frequency stabilized laser 112 is split into a third light beam and a fourth light beam by the second depolarizing beam splitter 122, the third light beam is reflected by the third reflector 133, and then coincides with the first light beam in the first atomic gas cell 141, and passes through the first atomic gas cell 141 in the opposite direction, and then is blocked by the first light blocking plate 181, the fourth light beam is reflected by the fourth reflector 134, and then coincides with the second light beam in the second atomic gas cell 142, passes through the second atomic gas cell 142 in the opposite direction, and then is blocked by the second light blocking plate 182.
The third light beam reflected by the third reflector 133 and then overlapped with the first light beam in the first atomic gas cell 141 means that: in the case where the third mirror 133 and the first light-blocking plate 181 do not block the first light beam between the first mirror 131 and the first polarizing beam splitter 151, and the first mirror 131 and the first polarizing beam splitter 151 do not block the third light beam between the third mirror 133 and the first light-blocking plate 181, the first light beam and the third light beam are maximally overlapped in the first atom cell 141.
The fourth light beam reflected by the fourth reflector 134 and then overlapped with the second light beam in the second atomic gas cell 142 means that: in the case where the fourth mirror 134 and the second light blocking plate 182 do not block the second light beam between the second mirror 132 and the second polarization beam splitter 152, and the second mirror 132 and the second polarization beam splitter 152 do not block the fourth light beam between the fourth mirror 134 and the second light blocking plate 182, the second light beam and the fourth light beam are maximally overlapped in the second atom cell 142.
The first atomic cell 141 applies no magnetic field and the second atomic cell 142 applies a magnetic field.
Two beams split by the first polarization beam splitter 151 are measured by a first photodetector 161 and a second photodetector 162, respectively; the two beams obtained by beam splitting by the second polarization beam splitter 152 are measured by the third photodetector 163 and the fourth photodetector 164, respectively; the first photodetector 161, the second photodetector 162, the third photodetector 163 and the fourth photodetector 164 are all connected to the logic circuit module 17, and the logic circuit module 17 is connected to the laser 111 to be frequency stabilized.
The logic circuit module 17 firstly subtracts the output signals of the first photodetector 161 and the second photodetector 162 to obtain a non-magnetic field electromagnetic induction transparent optical signal, and subtracts the output signals of the third photodetector 163 and the fourth photodetector 164 to obtain a magnetic field electromagnetic induction transparent optical signal, and the logic circuit module 17 then adds the non-magnetic field electromagnetic induction transparent optical signal and the magnetic field electromagnetic induction transparent optical signal to obtain a non-modulation dual-optical-path laser frequency stabilization error signal and outputs the non-modulation dual-optical-path laser frequency stabilization error signal to the laser 111 to be frequency stabilized, so that the frequencies of the laser 111 to be frequency stabilized and the laser 112 to be frequency stabilized are locked with each other.
The logic circuit module 17 includes a first subtracting circuit, a second subtracting circuit and an adding circuit, two input ends of the first subtracting circuit are respectively connected with output signals of the first photodetector 161 and the second photodetector 162, two input ends of the second subtracting circuit are respectively connected with output signals of the third photodetector 163 and the fourth photodetector 164, an input end of the adding circuit is respectively connected with an output end of the first subtracting circuit and an output end of the second subtracting circuit, and an output end of the adding circuit is connected with the laser 111 to be stabilized.
The error signals that achieve the frequency mutual locking of the laser to be frequency stabilized 111 and the frequency stabilized laser 112 are shown in fig. 2. The error signal in fig. 2 has a similar dispersion profile to a conventional PDH error signal, and is referred to as a non-modulated dual-optical-path laser frequency stabilization error signal. The steep dispersion curve in the center of the error signal provides a fast response of the absolute frequency deviation corresponding to the locking frequency of the laser to be frequency stabilized 111 after the frequencies of the laser to be frequency stabilized 111 and the frequency stabilized laser 112 are locked to each other. The line type range of two adjacent sides of the central steep dispersion curve is wide, which is helpful to pull back the phase-locked fixed frequency from large deviation, even if large disturbance such as electronic or mechanical pulse causes the mutual locking frequency of the laser 111 to be frequency stabilized and the frequency stabilized laser 112 to be far away from the resonance center. The non-modulation double-optical-path error laser frequency stabilization signal enables laser locking to have two advantages of high precision of atomic frequency locking and wide dynamic range recovery function of PDH frequency locking.
In order to evaluate the relative stability of the laser frequencies of the laser to be frequency stabilized 111 and the frequency stabilized laser 112 after being locked by the unmodulated dual-optical-path laser frequency stabilization error signal, the laser wavelength of the laser to be frequency stabilized 111 is directly recorded by using a commercial wavemeter. Fig. 3 shows the laser frequency deviation of the frequency-locked laser 111 to be frequency-stabilized according to the present invention. After the frequency locking is carried out by the utility model, the laser frequency fluctuation of the laser 111 to be frequency stabilized is strongly inhibited and is less than 1MHz (see a locking line with time of less than 30 s), which shows that the utility model is very effective for the precise frequency locking of the laser. The utility model has strong environmental interference resistance. As shown in fig. 3, when a large external pulse disturbance is applied to the laser 111 to be frequency stabilized at time 30s, the laser frequency of the laser 111 to be frequency stabilized is rapidly returned to the central locking point after being unlocked for only a few seconds. Because the special linearity of the error signal dispersion curve of the present invention allows it to have a large frequency acquisition range. As long as the external disturbance does not exceed the frequency lock capture range shown in fig. 2, the laser frequency of the laser 111 to be frequency stabilized can be restored to the original lock point.
The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.
Claims (2)
1. A device for realizing laser frequency stabilization by utilizing a double-path atomic polarization spectral line comprises a stabilized laser (112) and is characterized by further comprising a to-be-stabilized laser (111), wherein an emergent light beam of the to-be-stabilized laser (111) is divided into a first light beam and a second light beam after passing through a first depolarization beam splitter (121), the first light beam is reflected by a first reflector (131), then passes through a first atomic gas chamber (141) and is split into two light beams by a first polarization beam splitter (151), the second light beam is reflected by a second reflector (132), then passes through a second atomic gas chamber (142) and is split into two light beams by a second polarization beam splitter (152),
an emergent light beam of the stabilized frequency laser (112) is split into a third light beam and a fourth light beam by a second depolarization beam splitter (122), the third light beam is reflected by a third reflector (133) and then coincides with the first light beam in a first atom air chamber (141), reversely passes through the first atom air chamber (141) and then is shielded by a first light baffle plate (181), the fourth light beam is reflected by a fourth reflector (134) and then coincides with the second light beam in a second atom air chamber (142), reversely passes through the second atom air chamber (142) and then is shielded by a second light baffle plate (182),
the first atomic gas cell (141) does not apply a magnetic field, the second atomic gas cell (142) applies a magnetic field,
two beams obtained after beam splitting by the first polarization beam splitter (151) are respectively measured by a first photoelectric detector (161) and a second photoelectric detector (162); two beams obtained by beam splitting of the second polarization beam splitter (152) are measured by a third photoelectric detector (163) and a fourth photoelectric detector (164) respectively; the first photoelectric detector (161), the second photoelectric detector (162), the third photoelectric detector (163) and the fourth photoelectric detector (164) are all connected with the logic circuit module (17), and the logic circuit module (17) is connected with the laser (111) to be frequency stabilized.
2. The device for realizing laser frequency stabilization by using the two-way atomic polarization line according to claim 1, wherein the logic circuit module (17) comprises a first subtraction circuit, a second subtraction circuit and an addition circuit, two input ends of the first subtraction circuit are respectively connected with output signals of the first photodetector (161) and the second photodetector (162), two input ends of the second subtraction circuit are respectively connected with output signals of the third photodetector (163) and the fourth photodetector (164), input ends of the addition circuit are respectively connected with an output end of the first subtraction circuit and an output end of the second subtraction circuit, and an output end of the addition circuit is connected with the laser (111) to be stabilized.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116937325A (en) * | 2023-09-19 | 2023-10-24 | 上海频准激光科技有限公司 | Beam frequency control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116937325A (en) * | 2023-09-19 | 2023-10-24 | 上海频准激光科技有限公司 | Beam frequency control system |
| CN116937325B (en) * | 2023-09-19 | 2023-12-01 | 上海频准激光科技有限公司 | Beam frequency control system |
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