CN105762641A - Reflection type integrated device for sub-Doppler DAVLL spectrums - Google Patents
Reflection type integrated device for sub-Doppler DAVLL spectrums Download PDFInfo
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- CN105762641A CN105762641A CN201610221794.3A CN201610221794A CN105762641A CN 105762641 A CN105762641 A CN 105762641A CN 201610221794 A CN201610221794 A CN 201610221794A CN 105762641 A CN105762641 A CN 105762641A
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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
- H01S3/1303—Stabilisation of laser output parameters, e.g. frequency or amplitude by using a passive reference, e.g. absorption cell
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Abstract
The invention relates to a reflection type integrated device for sub-Doppler DAVLL spectrums. The reflection type integrated device comprises a laser light source, a spectroscope, an atom air chamber, a Helmholtz wire coil, a reflecting mirror, a quarter wave plate, a polarization analyzer, a first photoelectric detector and a second photoelectric detector, wherein laser sent out by the laser light source is divided into two routes via the spectroscope, and one route of laser is emitted outward; the other route of laser reaches the reflecting mirror after going through the atom air chamber, then returns along an original light path after being reflected by the reflecting mirror, and orderly passes the atom air chamber, the spectroscope and the quarter wave plate before arriving at the polarization analyzer. The laser is divided by the polarization analyzer into two routes of laser light that are vertical to the polarization direction, and the two routes of laser light are respectively received by the first photoelectric detector and the second photoelectric detector; the reflection type integrated device improves stability and integration property of the sub-Doppler DAVLL spectrums, and the precision, the stability and the integration level of relevant specific applications can be substantially raised.
Description
Technical field
The present invention relates to laser frequency and stablize field, be specifically related to a kind of reflective integrating device for sub-Doppler's DAVLL spectrum.
Background technology
In recent years, along with the development of LASER Light Source, laser instrument has become the important component part in the fields such as basic physics research, accurate measurement and inertial navigation.For the specifically application such as quantum simulation, quantum calculation, atomic clock, light clock, atom magnetometer, cold atom interference gyro instrument, SERF gyroscope and magnetic resonance gyroscope instrument, the LASER Light Source of frequency stable is all core component.Due to the impact of operating temperature and operating current, the frequency of the laser instrument of free-running is unstable.Utilize the Hyperfine level structure spectrum of atom, by the frequency stable of laser instrument at required resonant transition line, be obtain the means that the LASER Light Source of frequency stable is the most basic.Sub-Doppler DVALL (dichroicatomicvaporlaserlock) spectrum is exactly one of atom Hyperfine level structure spectrum the most commonly used in above-mentioned concrete application.
Sub-Doppler's DVALL spectrum is the atomic absorption spectrum utilizing the bitintability of alignment magnetic field Atom gas and obtaining.Owing to the same polarization state of pump light and detection light requires and light-intensity difference, there is a great deal of optical element for Polarization Control, intensity control, beam splitting and conjunction bundle in sub-Doppler's DAVLL spectrum.Too much optical element, introduces more noise, adds the spatial volume of frequency stabilization spectrum, reduces stability and the integration of frequency stabilization spectrum, have impact on the precision of relevant concrete application, degree of stability and integrated level.
Summary of the invention
It is an object of the invention to overcome the drawbacks described above of prior art, a kind of reflective integrating device for sub-Doppler's DAVLL spectrum is provided, the problem solving to bring for the optical element of Polarization Control, intensity control, beam splitting and conjunction bundle, enhance stability and the integration of sub-Doppler's DAVLL spectrum, significantly improve the precision of relevant concrete application, degree of stability and integrated level.
The above-mentioned purpose of the present invention is achieved mainly by following technical scheme:
A kind of reflective integrating device for sub-Doppler's DAVLL spectrum, including LASER Light Source, spectroscope, atomic air chamber, Helmholtz coil, reflecting mirror, quarter-wave plate, analyzer, first photodetector and the second photodetector, wherein reflecting mirror, atomic air chamber, spectroscope, quarter-wave plate, analyzer and the second photodetector are arranged successively, Helmholtz coil is wrapped in atomic air chamber outer surface, and reflecting mirror, atomic air chamber, spectroscope, quarter-wave plate, analyzer, second photodetector and Helmholtz coil are centrally located at same optical axis, first photodetector is arranged on analyzer side, and first photodetector vertical with described optical axis with place, the center straight line of analyzer, LASER Light Source is positioned at spectroscopical side；
The laser that described LASER Light Source sends is divided into two-way by spectroscope, a wherein outside outgoing of road laser, an other road laser is by arriving reflecting mirror after atomic air chamber, it is reflected mirror reflection tailing edge original optical path to return, analyzer is arrived after sequentially passing through atomic air chamber, spectroscope, quarter-wave plate, laser is divided into the laser that two-way polarization direction is vertical by analyzer, the first photodetector and the second photodetector receive respectively.
In the above-mentioned reflective integrating device for sub-Doppler's DAVLL spectrum, spectroscope is non-polarizing beamsplitter part, and spectroscopical splitting ratio is 1:9-1:99.
In the above-mentioned reflective integrating device for sub-Doppler's DAVLL spectrum, reflecting mirror is completely reflecting mirror or partially reflecting mirror.
In the above-mentioned reflective integrating device for sub-Doppler's DAVLL spectrum, the reflectance of completely reflecting mirror is 99%, and the reflectance of described partially reflecting mirror is 10%-90%.
In the above-mentioned reflective integrating device for sub-Doppler's DAVLL spectrum, in atomic air chamber, encapsulation rubidium atom, Cs atom, sodium atom or potassium atom, do not add buffer gas, it is provided that the nonlinear operation medium of atomic spectrum.
In the above-mentioned reflective integrating device for sub-Doppler's DAVLL spectrum, LASER Light Source adopts external cavity type semiconductor laser with tunable, and output polarization state is the laser of linear polarization.
In the above-mentioned reflective integrating device for sub-Doppler's DAVLL spectrum, quarter-wave plate will be converted to elliptically polarized light through spectroscopical reflection light, arrive analyzer afterwards.
The present invention compared with prior art has the advantages that
(1), a kind of reflective integrating device for sub-Doppler DAVLL spectrum of innovative design of the present invention, reflection type optical path is used to replace the beam splitting of the sub-Doppler's DAVLL spectrum of tradition to close beam optical path, ensure that pump light is identical with detection polarization state, significantly simplify optical element, decrease noise source, reduce the spatial volume of frequency stabilization spectrum, significantly improve stability and the integration of frequency stabilization spectrum.
(2), the reflective integrating device of the present invention use the pump light being completely superposed and detection light light path, enhance the frequency stabilization spectrum interference rejection ability to optical element vibration noise, further increase the stability of frequency stabilization spectrum.
(3), the reflective integrating device of the present invention compare tradition beam splitting close bundle formula spectral technique, stability improves about 3 times, and integrated level improves about 1.7 times.
Accompanying drawing explanation
Fig. 1 is the present invention reflective integrating device schematic diagram for sub-Doppler's DAVLL spectrum；
Fig. 2 is the stability comparison diagram of the present invention reflective integrating device for sub-Doppler's DAVLL spectrum and tradition beam splitting conjunction bundle formula spectral device.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
It is illustrated in figure 1 the present invention reflective integrating device schematic diagram for sub-Doppler's DAVLL spectrum, the reflective integrating device of the present invention includes LASER Light Source 1, spectroscope 2, atomic air chamber 3, Helmholtz coil 4, reflecting mirror 5, quarter-wave plate 6, analyzer the 7, first photodetector 8 and the second photodetector 9 as seen from the figure, is used for realizing sub-Doppler's DAVLL spectrum and detection thereof.
Wherein reflecting mirror 5, atomic air chamber 3, spectroscope 2, quarter-wave plate 6, analyzer 7 and the second photodetector 9 are arranged successively, Helmholtz coil 4 is wrapped in atomic air chamber 3 outer surface, and reflecting mirror 5, atomic air chamber 3, spectroscope 2, quarter-wave plate 6, analyzer the 7, second photodetector 9 and Helmholtz coil 4 are centrally located at same optical axis, namely above-mentioned each device be centrally located at on the same straight line of optical axis coincidence.First photodetector 8 is arranged on analyzer 7 side, and the first photodetector 8 is vertical with this optical axis with place, the center straight line of analyzer 7, and LASER Light Source 1 is positioned at the side of spectroscope 2.
The laser that LASER Light Source 1 sends is divided into two-way laser by spectroscope 2, a wherein outside outgoing of road laser, another road laser is by arriving reflecting mirror 5 after atomic air chamber 3, after being reflected mirror 5 reflection, return along original optical path, arriving analyzer 7 after sequentially passing through atomic air chamber 3, spectroscope 2, quarter-wave plate 6, laser is divided into the laser that two-way polarization direction is vertical by analyzer 7, the first photodetector 8 and the second photodetector 9 receive respectively.
Above-mentioned spectroscope 2 is non-polarizing beamsplitter part, and the splitting ratio of spectroscope 2 is 1:9-1:99.
Above-mentioned reflecting mirror 5 is completely reflecting mirror or partially reflecting mirror.The reflectance of completely reflecting mirror is 99%, and the reflectance of partially reflecting mirror is 10%-90%.
In above-mentioned atomic air chamber 3, encapsulation rubidium atom, Cs atom, sodium atom or potassium atom, do not add buffer gas, it is provided that the nonlinear operation medium of atomic spectrum.
Above-mentioned LASER Light Source 1 adopts external cavity type semiconductor laser with tunable, and output polarization state is the laser of linear polarization.
The present invention is using spectroscope 2, atomic air chamber 3, Helmholtz coil 4 and reflecting mirror 5 as core component.LASER Light Source 1, by spectroscope 2, produces spectrum and concrete application light splitting two-way laser；Spectrum is for the pump light needed for producing sub-Doppler polarization spectrum and detects light, and concrete application light splitting specifically applies required light and atomic interaction for producing quantum simulation, quantum calculation, atomic clock, light clock, atom magnetometer, cold atom interference gyro instrument, SERF gyroscope and magnetic resonance gyroscope instrument etc..The polarization state of spectrum is linear polarization, as pump light by the atomic air chamber 3 coaxial with Helmholtz coil 4.Due to the absorption of atomic medium, the light intensity of transmission pump light decays, can as detection light.Afterwards, reflecting mirror 6 makes detection light return atomic air chamber 3 along input path, and owing to pump light and the detection light of correlation constitute sub-Doppler search, the frequency stabilization spectrum obtained is not by the impact of atom Doppler effect.Because the alignment magnetic field that Helmholtz coil 4 produces makes the hyperfine structure energy level generation Zeeman splitting of atom, so, the resonance absorption frequency of the Left-hand circular polarization state and right-hand circular polarization state composition that constitute linear polarization will relative to without magnetic reference frequency generation red shift and blue shift, Left-hand circular polarization state composition and right-hand circular polarization state composition is made to produce difference for the absorbance of same frequency, here it is the bitintability of alignment magnetic field Atom gas.Bitintability makes detection light linear polarization after by atomic air chamber 3 rotate, thus carrying the bitintability information of alignment magnetic field Atom gas.Pass sequentially through spectroscope 2 and quarter-wave plate 6 from the detection light of atomic air chamber 3 transmission after, the difference measurement unit being made up of analyzer 7 and photodetector 8,9 is used the bitintability information entrained by detection light to be taken out, obtain the double-colored absorption spectrum of atom, i.e. sub-Doppler's DAVLL spectrum.Sub-Doppler's DAVLL spectrum is received by photodetector 8,9, is converted into the signal of telecommunication of frequency stabilization spectrum, for the frequency stable of LASER Light Source 1.
Embodiment 1
LASER Light Source 1 adopts external cavity type semiconductor laser with tunable, and model is TopticaDL100, centre wavelength 780.24nm, live width 4MHz, output 101mW, and laser polarization state is linear polarization；Spectroscope 2 is the thick quartz glass plate of diameter 10mm, splitting ratio 1:99；Atomic air chamber 3 is 10mm3Quartz glass chamber, interior encapsulation rubidium atom vapor, but do not add buffer gas, pressure 10-7Torr, it is provided that the nonlinear operation medium of atomic spectrum；Helmholtz coil 4 is replaced by the customization cuboid permanent magnet of 20mm × 15mm × 2mm；Reflecting mirror 5 diameter 10mm, reflectance is 99%；Quarter-wave plate 6 is the true zero-th order waveplates of diameter 10mm；Analyzer 7 is 10mm3Square polarization beam splitter prism, extinction ratio > 1000:1；First photodetector 8 and the second photodetector 9 all adopt thorlabsFDS02 silicon photocell, dark current 35pA (5V).
The integrated level contrast information slip closing bundle formula spectral device for the present invention for reflective integrating device and the tradition beam splitting of sub-Doppler's DAVLL spectrum as shown in table 1 below, the component count of reflective integrating device is 9 as shown in Table 1, size (long × wide × high) is 75mm × 20mm × 20mm, compared with closing bundle formula spectrum with tradition beam splitting, the component count of reflective integrating device decreases 40%, overall dimensions decreases 60%, and integrated level significantly improves about 1.7 times.
Table 1
Noise source in the present embodiment 1 is mainly made up of two parts: the optical element vibration noise that the flowing of (1) air and platform vibrations produce.(2) during LASER Light Source 1 free-running, the phase noise that frequency drift produces.By using reflective integrating device to carry out frequency stable, both noises are all effectively suppressed.It is illustrated in figure 2 the stability comparison diagram of the present invention reflective integrating device for sub-Doppler's DAVLL spectrum and tradition beam splitting conjunction bundle formula spectral device, using interferometer measurement specific embodiment 1 and tradition beam splitting to close the noise in bundle formula spectrum, the measurement time is 450s.When in Fig. 2, signal 1 (in Fig. 2 uppermost signal) is without frequency stabilization, the noise signal in bundle formula spectrum is closed in tradition beam splitting, the noise signal of specific embodiment 1 when signal 2 (signal in the middle of in Fig. 2) is without frequency stabilization in Fig. 2, contrast two groups of data known, the vibration noise that tradition beam splitting is closed in bundle formula spectrum obtains obvious suppression in reflective integrating device, and during without frequency stabilization, the noise signal of specific embodiment 1 slowly varying is the marked feature of LASER Light Source frequency drift.The noise signal that in Fig. 2, signal 3 (in Fig. 2 nethermost signal) is specific embodiment after frequency stabilization 1, signal 2 in comparison diagram 2 is known, after utilizing atomic spectrum to carry out frequency stable, the slow change produced by frequency drift in noise signal have also been obtained effective suppression.Therefore, using reflective integrating device, the stability of frequency stabilization spectrum obtains significant raising, and compared with closing bundle formula spectrum with tradition beam splitting, its noise signal standard deviation reduces about 3 times.
The above; being only the detailed description of the invention that the present invention is best, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention.
The content not being described in detail in description of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (7)
- null1. the reflective integrating device for sub-Doppler's DAVLL spectrum，It is characterized in that: include LASER Light Source (1)、Spectroscope (2)、Atomic air chamber (3)、Helmholtz coil (4)、Reflecting mirror (5)、Quarter-wave plate (6)、Analyzer (7)、First photodetector (8) and the second photodetector (9)，Wherein reflecting mirror (5)、Atomic air chamber (3)、Spectroscope (2)、Quarter-wave plate (6)、Analyzer (7) and the second photodetector (9) are arranged successively，Helmholtz coil (4) is wrapped in atomic air chamber (3) outer surface，And reflecting mirror (5)、Atomic air chamber (3)、Spectroscope (2)、Quarter-wave plate (6)、Analyzer (7)、Second photodetector (9) and Helmholtz coil (4) are centrally located at same optical axis，First photodetector (8) is arranged on analyzer (7) side，And first photodetector (8) vertical with described optical axis with place, the center straight line of analyzer (7)，LASER Light Source (1) is positioned at the side of spectroscope (2)；The laser that described LASER Light Source (1) sends is divided into two-way by spectroscope (2), a wherein outside outgoing of road laser, an other road laser arrives reflecting mirror (5) afterwards by atomic air chamber (3), it is reflected mirror (5) reflection tailing edge original optical path to return, sequentially pass through atomic air chamber (3), spectroscope (2), quarter-wave plate (6) arrive analyzer (7) afterwards, laser is divided into the laser that two-way polarization direction is vertical by analyzer (7), the first photodetector (8) and the second photodetector (9) receive respectively.
- 2. a kind of reflective integrating device for sub-Doppler's DAVLL spectrum according to claim 1, it is characterised in that: described spectroscope (2) is non-polarizing beamsplitter part, and the splitting ratio of spectroscope (2) is 1:9-1:99.
- 3. a kind of reflective integrating device for sub-Doppler's DAVLL spectrum according to claim 1, it is characterised in that: described reflecting mirror (6) is completely reflecting mirror or partially reflecting mirror.
- 4. a kind of reflective integrating device for sub-Doppler's DAVLL spectrum according to claim 3, it is characterised in that: the reflectance of described completely reflecting mirror is 99%, and the reflectance of described partially reflecting mirror is 10%-90%.
- 5. a kind of reflective integrating device for sub-Doppler's DAVLL spectrum according to claim 1, it is characterized in that: encapsulation rubidium atom, Cs atom, sodium atom or potassium atom in described atomic air chamber (3), do not add buffer gas, it is provided that the nonlinear operation medium of atomic spectrum.
- 6. a kind of reflective integrating device for sub-Doppler's DAVLL spectrum according to claim 1, it is characterised in that: described LASER Light Source (1) adopts external cavity type semiconductor laser with tunable, and output polarization state is the laser of linear polarization.
- 7. a kind of reflective integrating device for sub-Doppler's DAVLL spectrum according to claim 1, it is characterized in that: the reflection light through spectroscope (2) is converted to elliptically polarized light by described quarter-wave plate (6), arrive analyzer (7) afterwards.
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| CN106595626A (en) * | 2016-12-19 | 2017-04-26 | 北京航空航天大学 | Nuclear magnetic resonance gyroscope elliptically polarized light detection system |
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| CN109342980A (en) * | 2018-10-31 | 2019-02-15 | 浙江工业大学 | Monochromatic light Mx atom magnetometer based on elliptical light |
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| CN109270029A (en) * | 2018-09-29 | 2019-01-25 | 山西大学 | It is a kind of for detecting the general NICE-OHMS system of sub- Doppler's spectrum |
| CN109270029B (en) * | 2018-09-29 | 2020-12-25 | 山西大学 | Universal NICE-OHMS system for detecting sub-Doppler spectrum |
| CN109342980A (en) * | 2018-10-31 | 2019-02-15 | 浙江工业大学 | Monochromatic light Mx atom magnetometer based on elliptical light |
| CN111025201A (en) * | 2019-12-02 | 2020-04-17 | 北京航天控制仪器研究所 | Probe light path structure of atomic magnetometer |
| CN113067244A (en) * | 2021-03-29 | 2021-07-02 | 中国计量科学研究院 | Laser frequency and power stabilizing system and atomic magnetometer comprising same |
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