CN103825184A - Ultra narrow band excited state faraday anomalous dispersion atom filter of communication band - Google Patents
Ultra narrow band excited state faraday anomalous dispersion atom filter of communication band Download PDFInfo
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- CN103825184A CN103825184A CN201410082079.7A CN201410082079A CN103825184A CN 103825184 A CN103825184 A CN 103825184A CN 201410082079 A CN201410082079 A CN 201410082079A CN 103825184 A CN103825184 A CN 103825184A
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Abstract
The invention belongs to the technical field of optical space communication, particularly relates to an ultra narrow band excited state faraday anomalous dispersion atom filter of a communication band, and aims at effectively improving the pumping efficiency of the excited state atom filter and overcoming the problems of complicated light path, high demands on an environmental condition, poor adaptability and low practicability caused by a pump laser frequency stabilization module. An external frequency stabilization module is removed by the filter while an Rb atomic vapor absorption peak inside the filter is utilized as a frequency standard. Thus, the ultra narrow band excited state faraday anomalous dispersion atom filter is simpler in structure, better in work stability and higher in efficiency. The scheme is combined with a generation principle of a multi-transition absorption band, and the targeted frequency stabilization mod is adopted, so that a good pumping effect can be obtained.
Description
Technical field
The invention belongs to Space Optical Communication Technologies field, be specifically related to a kind of super narrowband excitation state faraday anomalous dispersion atomic light filter of communication band.
Background technology
The effect of filter is to extract faint narrowband optical signal from stronger broadband bias light, and it is one of core Primary Component in the various application technologies such as submarine optical communication, free space optical communication, deep space optical communication, remote sensing, laser radar, meteorology.In order effectively to suppress the background noises such as solar radiation, black body radiation and the scattered light being caused by the scattering medium such as atmosphere, seawater and benthon be luminous, guarantee that receiving system has higher signal to noise ratio, simultaneously signal transmission light expeditiously again, make receiving system have higher detection sensitivity, require filter to there is following performance: narrow bandwidth, high-transmission rate, the large angle of visual field and higher out-of-band noise rejection ratio, simultaneously in order to meet the needs of Real-Time Optical communication, require system to have faster degree time response.
Traditional filter is as interferometric filter, and its passband width is in the magnitude of 10nm; Some crystal filters that utilize birefringence effect to make, the thickness of its optical filtering bandwidth and crystal is inversely proportional to, and the thickness that increases crystal can greatly dwindle it and receives solid angle and increase the loss in passband, is difficult to meet the requirement of narrow bandwidth and high-transmission rate simultaneously.In a word, the performance of conventional filters can not meet the requirement of current practical application far away.
From eighties of last century seventies, people start to consider to utilize the super arrowband resonance characteristics development filtering device of atom, and ARF (atom resonance filter, atom resonance light filter) is one of them.Through the research of more than ten years, for laser radar, subsurface communication, the ARF of the dive objects such as communication, atmospheric communication, deep space communication is all had to report.But along with the development of ARF, people have also found the limitation of ARF gradually, such as low-response, can not be used for imaging etc.
In 1991, a kind of novel atomic light filter: Faraday anomalous dispersion optical filter (Faraday anomalous dispersion optical filter, FADOF) is developed out.Faraday anomalous dispersion phenomenon refers to when linearly polarized light is propagated in the atom vapor that is added with constant longitudinal magnetic field, because Atomic absorption line issues estranged splitting at magnetic fields, there are different absorptions and effect of dispersion for Left-hand circular polarization (LCP) light and right-hand circular polarization (RCP) light, cause former linearly polarized light plane of polarization to rotate.
FADOF is made up of two orthogonal polarizers and the atom steam chest that is placed in longitudinal magnetic field, first polarizer has been used for partially, the Resonant Faraday effect of atom vapor rotates the plane of polarization of the flashlight in passband, by the change in temperature and magnetic field being controlled to the angle of rotation, make the flashlight in passband can see through to greatest extent second polarizer for analyzing, and out of band signal plane of polarization is constant, so blocked by two orthogonal Glan prisms.This is the basic principle that FADOF filters.
The service band of FADOF is limited to the Absorption Line of atom, and its transmission peaks position is generally positioned at the passband width of the Atomic absorption line several GHz in center, is mainly determined by the broadening effect of Atomic absorption line, as Doppler broadening, collision broadening etc.In order to make the atomic light filter of certain required wave band, must find the Atomic absorption line in this target wave band.Due to the Basic Physical Properties restriction of material, what can make at present atomic light filter is mainly alkali metal atom and part alkaline earth metal atom, because the steam of these atoms can obtain at relatively low temperature.The kind of atom is limited, and the ground state Absorption Line of these atoms covers also good dealing with various requirements of wave band.It is just much extensive that but the excitation state transition of atom covers wave band, and therefore the atomic light filter of excitation state becomes research emphasis afterwards.
The difficult point of excited atom filter is how to prepare the atom population of excitation state, because under normal condition, atom is all in the ground state level in minimum energy, utilizes excited of atoms to make filter if want, just must atom be activated to excitation state from ground state by external energy and get on.This process can be used the extrinsic motivated sources such as laser pumping, atomic lamp pump or microwave excitation to realize.Wherein, laser is most effective as driving source, and accuracy is best, can try one's best many to make atom on target excited level.And atomic lamp or microwave excitation are more uncontrollable, all that atomic excitation is dropped at random to low-lying level by atom after on some high level, can cause atom to have population at multiple energy levels, although also can obtain transmission spectral line, but uncontrollable atom, in which excitation level, also can produce the fluorescence interference signal of the non-constant width of bands of a spectrum simultaneously.
Laser pumping also has its shortcoming to exist, and laser is as accurately pump mode of one, the ground state level transition to quasiatom exactly of its optical maser wavelength, and this has just proposed higher requirement to the frequency stability of laser.Therefore use the excited atom filter of laser pumping must comprise pumping laser frequency stabilization module.The laser frequency stabilization module using at present has atom saturated absorption spectrum frequency stabilization and the large class of optical resonator frequency stabilization two, and its common ground is light path more complicated, and working environment is had relatively high expectations, and bad adaptability causes the practicality of excited atom filter lower.Therefore,, how for these defects, the excitation state faraday anomalous dispersion atomic light filter that provides a kind of pumping efficiency of effective raising excited atom filter simultaneously to simplify laser frequency stabilization module, has become the technique direction of current primary study.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: for existing excitation state faraday anomalous dispersion atomic light filter, how effectively to improve the pumping efficiency of excited atom filter, and overcome that the light path complexity, the requirement for environmental conditions that cause because of pumping laser frequency stabilization module are high, bad adaptability and the low problem of practicality.
(2) technical scheme
For solving the problems of the technologies described above, the super narrowband excitation state faraday anomalous dispersion atomic light filter that the invention provides a kind of communication band, described filter comprises: quarter-wave plate 10, polarization splitting prism 11, the first photodetector 12, the second photodetector 13, difference engine 14 and the frequency stabilization server 15 of semiconductor laser 1, laser isolator 2, coupling dichroism eyeglass 3, light splitting dichroism eyeglass 4, Rb atom steam bubble 5, magnetic field generator 6, heater 7, analyzer 8, polarizer 9,780nm;
Described semiconductor laser 1 is tunable 780nm semiconductor laser, and it is for providing Rb atomic ground state 5
2s
1/2to target excitation state 5
2p
3/2pumping laser;
Described laser isolator 2 sees through for guaranteeing that pumping laser signal is unidirectional, cuts off by the light signal reflecting on rear class optics;
Described coupling is arranged between described analyzer 8 and Rb atom steam bubble 5 with dichroism eyeglass 3, and be positioned on the transmitted light path of described laser isolator 2, it is set to the high transmission of 1529nm light, and to the high reflection of 780nm light, it for reducing as far as possible the loss of flashlight when pumping laser is introduced to filter light path;
Described light splitting is arranged between described Rb atom steam bubble 5 and polarizer 9 with dichroism eyeglass 4, and be positioned on the transmitted light path of described Rb atom steam bubble 5, it is set to the high transmission of 1529nm light, to the high reflection of 780nm light, it is for extracting pump light from filter light path, in order to carry out frequency stabilization in rear class light path, reduce as far as possible the loss of flashlight simultaneously;
Described Rb atom steam bubble 5 is arranged on described coupling dichroism eyeglass 3 reflected light paths, and bubble adopts quartz material, and it is set to all possess high-transmission rate at near-infrared 780nm and 1529nm;
Described magnetic field generator 6 is arranged on described Rb atom steam bubble 5, and it is for generation of the external magnetic field signal for Rb atom steam bubble 5 is acted on;
Described heater 7 is arranged on described Rb atom steam bubble 5, and it is for controlling the working temperature of described Rb atom steam bubble 5;
Described analyzer 8 and polarizer 9 are arranged at the light path two ends of described Rb atom steam bubble 5, described analyzer 8 is set to mutually orthogonal with polarizer 9, described polarizer 9 is set to allow the flashlight of linear polarization to see through, and makes stray light only have a linear polarization component to see through; Described analyzer 8 be set to by with the mutually orthogonal spurious rays polarized component seeing through through polarizer 9 that filters out of polarizer 9;
The quarter-wave plate 10 of described 780nm, it is arranged on the reflected light path of described light splitting dichroism eyeglass 4, and it is for becoming respectively the linearly polarized light in wave plate main shaft and the angled direction of countershaft by the Left-hand circular polarization component of incident optical signal and right-hand circular polarization component;
Described polarization splitting prism 11 is arranged on the outgoing path of described quarter-wave plate 10, it is for by the linearly polarized light beam splitting in the main shaft of quarter-wave plate 10 outgoing and countershaft direction, outgoing on both direction, thus the left circularly polarized light of light signal and right-hand circular polarization light component are extracted respectively;
Described the first photodetector 12 is for being converted into the aforementioned left circularly polarized light extracting first signal of telecommunication and exporting difference engine 14 to;
Described the second photodetector 13 is for being converted into the aforementioned right-circularly polarized light extracting second signal of telecommunication and exporting difference engine 14 to;
Described difference engine 14 is for carrying out signal subtraction, generated frequency shifted signal by first signal of telecommunication and second signal of telecommunication of input;
Described frequency stabilization server 15 is for according to described frequency offset signals, generation feeds back to the control signal of described semiconductor laser 1, described control signal is for adjusting the operating frequency of semiconductor laser 1, and frequency of amendment is offset, thereby optical maser wavelength is locked on the position of pumping efficiency maximum.
Wherein, in the light path of described Rb atom steam bubble 5, the other end of described polarizer 9 relative Rb atom steam bubbles 5 is also provided with tunable 1529nm lasing light emitter 16, and the other end of described analyzer 18 relative Rb atom steam bubbles 5 is also provided with the 3rd photodetector 17;
Described tunable 1529nm lasing light emitter 16 is incident to Rb atom steam bubble 5 for generation of wavelength continually varying flashlight through polarizer 9, thereby for detection of signal optical transmission situation within the scope of one section of continuous wavelength;
Described the 3rd photodetector 17 is for being converted into signal of telecommunication record by the flashlight of analyzer 18 transmissions, because signal light wavelength changes continuously, therefore the flashlight of recording occurring continuously transmission just can obtain take wavelength as independent variable, and the curve that transmissivity is value is also transmission spectrum.
Wherein, point optical axis angle at 45 ° of the main shaft of described quarter-wave plate 10 and countershaft and described polarization splitting prism 11.
Wherein, described heater 7 is operated in the arbitrary temp of normal temperature to 200 ℃ for controlling described Rb atom steam bubble 5.
(3) beneficial effect
Compared with prior art, technical solution of the present invention possesses following some beneficial effect:
(1) pumping efficiency is high, and pumping accuracy and final filter parameter are all higher than microwave excitation or atomic lamp pump.
(2) simple in structure, save outside frequency regulator, use the inner atom vapor of atomic light filter chamber to carry out frequency stabilization, reduce the requirement of environment to external world.
(3) long-time stability are better, adopt the mangneto division zone frequency stabilization of atom, can follow to a certain extent magnetic field slight change self adaptation and regulate operation wavelength, remain efficient pumping.
Accompanying drawing explanation
The atomic transition line schematic diagram that Fig. 1 utilizes for communication band Rb atomic light filter.
Fig. 2 is the many absorption band phenomenon schematic diagram of Rb atomic ground state energy level to first excited state energy level.
Fig. 3 is the spectral line schematic diagram that Simple Theory model produces many transition of mangneto line coincidence phenomenon.
Fig. 4 is the circular polarization differential signal schematic diagram that Simple Theory model obtains.
Fig. 5 is the spectral line schematic diagram that Rb atom D2 line is surveyed many transition of the mangneto line coincidence phenomenon obtaining.
Fig. 6 is that Rb atom D2 line is surveyed the circular polarization differential signal schematic diagram obtaining.
Fig. 7 is the excitation state faraday anomalous dispersion atomic light filter overall structure schematic diagram of technical solution of the present invention.
Fig. 8 be under 110 ℃, pumping light power 24mW condition technical solution of the present invention at the transmission spectral line schematic diagram of 1529nm.
Fig. 9 is the maximum transmission rate situation of change schematic diagram obtaining at 110 ℃, different pumping power.
Embodiment
For making object of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
First, about accompanying drawing of the present invention, the atomic transition line schematic diagram that Fig. 1 utilizes for communication band Rb atomic light filter.Fig. 2 is the many absorption band phenomenon schematic diagram of Rb atomic ground state energy level to first excited state energy level.Fig. 3 is the spectral line schematic diagram that Simple Theory model produces many transition of mangneto line coincidence phenomenon.Fig. 4 is the circular polarization differential signal schematic diagram that Simple Theory model obtains.Fig. 5 is the spectral line schematic diagram that Rb atom D2 line is surveyed many transition of the mangneto line coincidence phenomenon obtaining.Fig. 6 is that Rb atom D2 line is surveyed the circular polarization differential signal schematic diagram obtaining.
For solving the problem of prior art, technical solution of the present invention emphasis is for the modal 1.5 mu m waveband laser signals of communication band, choose Alkali Metal Rb atom (rubidium, Rb) as work atom, adopt condition of work that many transition overlap and the mode of operation of inner frequency stabilization, use laser to Rb 5
2s
1/2→ 5
2p
3/2(780.24nm) carry out pumping, then utilize 5 of Rb
2p
3/2→ 4
2d
5/2(1529.354nm) communication band excitation state faraday anomalous dispersion atomic light filter is made in transition.
Atom is for having sink effect with the laser of transition line resonance, but the Absorption Line of actual atom is not discrete line to distribute, but the absorption band with certain bandwidth distributes, and be positioned at absorption band, specifically be in absorption band peak place or sideband position, absorptivity is not identical yet.The width of absorption band is mainly determined by broadening, generally comprises natural linewidth, Doppler broadening and pressure collision broadening.In order to obtain as far as possible many atom vapors, the working temperature of atomic light filter is generally more than 100 degrees Celsius, and broadening effect is now mainly Doppler broadening, and broadening magnitude is about GHz.Due to the existence of alkali metal atom nuclear spin, there is hyperfine structure in atomic energy level in addition, the Rb atom using with regard to the present invention, and its two kinds of isotope 85Rb and the hyperfine splitting of 87Rb ground state are respectively 3GHz and 6.8GHz apart, excitation state 5
2p
3/2hyperfine splitting narrow, do not exceed 1GHz, therefore, under the condition that there is no externally-applied magnetic field, Rb atom all can present the absorption band of four Doppler broadenings.But generally even narrower at MHz for the semiconductor laser live width of laser pumping, can only select a Frequency point in an absorption band to carry out pumping, the atom being positioned on other meticulous energy levels cannot be utilized.In addition, the atom of faraday anomalous dispersion atomic light filter also needs to be operated in magnetic field, and externally-applied magnetic field can cause the different atom of magnetic spin quantum number to produce energy level splitting, wider, dispersion more that absorption band can become.But, can be by suitable condition of work be set, make the mangneto divisural line of the different energy levels of atom overlapping and merge.Calculate and experiment measuring by theory, select magnetic field to be operated in 450G between 600G, now 5 of Rb atom
2s
1/2(F=2) → 5
2p
3/2the low frequency wonder division zone and 5 of transition band
2s
1/2(F=3) → 5
2p
3/2the high frequency drift division zone of transition overlaps, and even can form than stronger Absorption Line before mangneto division.Clearly, this enhancement effect is to have merged than just forming without transition line more strong under magnetic field condition.Under the condition overlapping at this many transition line, select its absorption peak position to carry out pumping and can obtain very high pumping efficiency.
Because external magnetic field is stronger, Rb atom is 5
2s
1/2→ 5
2p
3/2absorption line on line alters a great deal, and in this case, the laser frequency that external saturated absorption frequency stabilization mode locks has been no longer the maximum resonance absorption point of filter core Rb atom; Although and the frequency stabilization mode of external optical resonator can be aimed at laser frequency absorption maximum, optical resonator is very responsive, affected greatly by operational environment, mode of operation easily changes, and long-time stability are poor.Technical solution of the present invention has been removed external frequency stabilization module, but utilizes the Rb atom vapor absworption peak of filter inside as frequency standard, and structure is simpler, and job stability is better and efficiency is higher.In conjunction with the generation principle of many transition absorption band, this scheme adopts a kind of very pointed frequency stabilization mode, can obtain good pumping effect.Because pumping absorption band used is produced by mangneto division, and be to be staggered to form by two transition bands high frequency drift two absorption bands contrary with low frequency wonder separately, so can infer that the circular polarization of these two absorption bands is just contrary.Adopt a simple circular polarization to divide beam optical path just these two components can be extracted respectively, the frequency offset signals that can be absorbed in band by doing the mode of Differential Detection, and carry out frequency stabilization.
Particularly, as shown in Figure 7, Fig. 7 is the main structure chart of technical solution of the present invention.Wherein, the filter that this technical scheme provides comprises:
Quarter-wave plate 10, polarization splitting prism 11, the first photodetector 12, the second photodetector 13, difference engine 14 and the frequency stabilization server 15 of semiconductor laser 1, laser isolator 2, coupling dichroism eyeglass 3, light splitting dichroism eyeglass 4, Rb atom steam bubble 5, magnetic field generator 6, heater 7, analyzer 8, polarizer 9,780nm;
Described semiconductor laser 1 is tunable 780nm semiconductor laser, and it is for providing Rb atomic ground state 5
2s
1/2to target excitation state 5
2p
3/2pumping laser;
Described laser isolator 2 sees through for guaranteeing that pumping laser signal is unidirectional, cuts off by the light signal reflecting on rear class optics, to avoid the mode of operation of light feedback influence semiconductor laser, causes job insecurity;
Described coupling is arranged between described analyzer 8 and Rb atom steam bubble 5 with dichroism eyeglass 3, and be positioned on the transmitted light path of described laser isolator 2, it is set to the high transmission of 1529nm light, and to the high reflection of 780nm light, it for reducing as far as possible the loss of flashlight when pumping laser is introduced to filter light path;
Described light splitting is arranged between described Rb atom steam bubble 5 and polarizer 9 with dichroism eyeglass 4, and be positioned on the transmitted light path of described Rb atom steam bubble 5, it is set to the high transmission of 1529nm light, to the high reflection of 780nm light, it is for extracting pump light from filter light path, in order to carry out frequency stabilization in rear class light path, reduce as far as possible the loss of flashlight simultaneously;
Described Rb atom steam bubble 5 is arranged on described coupling dichroism eyeglass 3 reflected light paths, and bubble adopts quartz material, and it is set to all possess high-transmission rate at near-infrared 780nm and 1529nm; The Rb atom steam bubble that is placed in magnetic field deflects because faraday anomalous dispersion effect can make near light signal polarization direction resonance level;
Described magnetic field generator 6 is arranged on described Rb atom steam bubble 5, it is for generation of the external magnetic field signal for Rb atom steam bubble 5 is acted on, best in order to reach transition line degrees of fusion, to guarantee that magnetic field is evenly distributed in whole light path as far as possible, otherwise the absworption peak wavelength location at same transition line different spatial place in light path is all different, is difficult to realize efficient absorption;
Described heater 7 is arranged on described Rb atom steam bubble 5, and it is for controlling the working temperature of described Rb atom steam bubble 5; High temperature can improve the saturated vapor pressure in Rb bubble, thereby increases gaseous atom number;
Described analyzer 8 and polarizer 9 are arranged at the light path two ends of described Rb atom steam bubble 5, described analyzer 8 is set to mutually orthogonal with polarizer 9, described polarizer 9 is set to allow the flashlight of linear polarization to see through, and makes stray light only have a linear polarization component to see through; Described analyzer 8 be set to by with the mutually orthogonal spurious rays polarized component seeing through through polarizer 9 that filters out of polarizer 9;
The quarter-wave plate 10 of described 780nm, it is arranged on the reflected light path of described light splitting dichroism eyeglass 4, it becomes respectively the linearly polarized light in wave plate main shaft and the angled direction of countershaft for the peculiar property according to quarter-wave plate by the Left-hand circular polarization component of incident optical signal and right-hand circular polarization component;
Described polarization splitting prism 11 is arranged on the outgoing path of described quarter-wave plate 10, it is for by the linearly polarized light beam splitting in the main shaft of quarter-wave plate 10 outgoing and countershaft direction, outgoing on both direction, thus the left circularly polarized light of light signal and right-hand circular polarization light component are extracted respectively;
Described the first photodetector 12 is for being converted into the aforementioned left circularly polarized light extracting first signal of telecommunication and exporting difference engine 14 to;
Described the second photodetector 13 is for being converted into the aforementioned right-circularly polarized light extracting second signal of telecommunication and exporting difference engine 14 to;
Described difference engine 14 is for carrying out signal subtraction, generated frequency shifted signal by first signal of telecommunication and second signal of telecommunication of input;
Described frequency stabilization server 15 is for according to described frequency offset signals, after amplifying after filtering, generation feeds back to the control signal of described semiconductor laser 1, described control signal is for adjusting the operating frequency of semiconductor laser 1, frequency of amendment skew, thus optical maser wavelength is locked on the position of pumping efficiency maximum.
Wherein, in the light path of described Rb atom steam bubble 5, the other end of described polarizer 9 relative Rb atom steam bubbles 5 is also provided with tunable 1529nm lasing light emitter 16, and the other end of described analyzer 18 relative Rb atom steam bubbles 5 is also provided with the 3rd photodetector 17;
Described tunable 1529nm lasing light emitter 16 is incident to Rb atom steam bubble 5 for generation of wavelength continually varying flashlight through polarizer 9, thereby for detection of signal optical transmission situation within the scope of one section of continuous wavelength;
Described the 3rd photodetector 17 is for being converted into signal of telecommunication record by the flashlight of analyzer 18 transmissions, because signal light wavelength changes continuously, therefore the flashlight of recording occurring continuously transmission just can obtain take wavelength as independent variable, and the curve that transmissivity is value is also transmission spectrum.
Wherein, point optical axis angle at 45 ° of the main shaft of described quarter-wave plate 10 and countershaft and described polarization splitting prism 11.
Wherein, described heater 7 is operated in the arbitrary temp of normal temperature to 200 ℃ for controlling described Rb atom steam bubble 5.
Speech therefrom, the filtering method of implementing based on above-mentioned super narrowband excitation state faraday anomalous dispersion atomic light filter specifically can comprise the steps:
Step S1: the external magnetic field signal that magnetic field generator 6 produces for Rb atom steam bubble 5 is acted on; Heater 7 is controlled the working temperature of described Rb atom steam bubble 5; Until field signal and temperature meet the predetermined work requirement of Rb atom steam bubble 5;
Step S2: semiconductor laser 1 produces 780nm pumping laser;
Step S3: laser isolator 2 is guaranteed that pumping laser signal is unidirectional and seen through, and cuts off by the light signal reflecting on rear class optics;
Step S4: coupling is reflected 780nm pumping laser with dichroism eyeglass 3, and reverberation enters Rb atom steam bubble 5;
Rb atom vapor in step S5:Rb atom steam bubble 5 under the effect of 780nm pumping laser from ground state 5
2s
1/2excite;
Step S6: light splitting is reflected the 780nm pumping laser transmiting through Rb atom steam bubble 5 with dichroism eyeglass 4, and reverberation enters quarter-wave plate 10;
Step S7: the Left-hand circular polarization component of incident optical signal and right-hand circular polarization component are become respectively the linearly polarized light in wave plate main shaft and the angled direction of countershaft by quarter-wave plate 10;
Step S8: polarization splitting prism 11 is the linearly polarized light beam splitting in the main shaft of quarter-wave plate 10 outgoing and countershaft direction, outgoing on both direction, thus the left circularly polarized light of light signal and right-hand circular polarization light component are extracted respectively;
Step S9: the first photodetector 12 will be converted into the aforementioned left circularly polarized light extracting first signal of telecommunication and export difference engine 14 to; The second photodetector 13 is for being converted into the aforementioned right-circularly polarized light extracting second signal of telecommunication and exporting difference engine 14 to; Difference engine 14 carries out signal subtraction, generated frequency shifted signal by first signal of telecommunication and second signal of telecommunication of input;
Step S10: frequency stabilization server 15, according to described frequency offset signals, will make Rb atom from ground state 5 by pumping laser
2s
1/2be energized into target excitation state 5
2p
3/2requirement, generate for revising the control signal of semiconductor laser 1 operating frequency;
Step S11: semiconductor laser 1 is adjusted its operating frequency according to described control signal, produces the revised 780nm pumping laser of frequency;
Repeating step S2 is to step S11, until the pumping laser frequency stabilization that semiconductor laser 1 is exported is for can make Rb atom from ground state 5
2s
1/2be energized into target excitation state 5
2p
3/2till.
Wherein, in described filtering method, also comprise:
See through the flashlight of linear polarization by polarizer 9, and the step that makes stray light only have a linear polarization component to see through; And,
By filtering out the step of the spurious rays polarized component seeing through through polarizer 9 with the mutually orthogonal analyzer 8 of polarizer 9.
In sum, in technical solution of the present invention, the main part that device 5～9 is atomic light filter, cross-polarization sheet 8,9 makes most light all cannot pass through filter, only have those genetic methods under rubidium bubble 5 and magnetic field 6, heater 7 actings in conjunction to draw the light signal polarization direction of Semi―classical theory to rotate, thereby transmission is gone out.
Device 12～15th, the frequency stabilization circuit module of laser.Because the spectrophotometric result of device 10,11 can not reach perfect, in addition the photoelectric conversion efficiency of photodetector 12,13 cannot be completely equal, therefore the signal of telecommunication of two circular component need to pass through difference channel 14 preliminary treatment before subtracting each other, adjust respectively background and multiplication factor, by testing in advance adjusting, two signals that finally subtract each other are equated with the power proportions relation of incident light circular component, otherwise can cause frequency stabilization effect to decline.Frequency offset is carried out filtering and amplification by frequency stabilization servo circuit 15, finally offers the wavelength control module of laser 1.For external-cavity semiconductor laser, be to be generally loaded on the piezoelectric ceramic PZT that regulates external cavity length.
Through implementing technical solution of the present invention, the transmission spectral line of the excitation state faraday anomalous dispersion atomic light filter of its inner many transition of frequency stabilization line pumping as shown in Figure 8, the maximum transmission rate situation of change that different pumping power obtains as shown in Figure 9, high-transmission rate can reach 60%, the about 1.4GHz of central peak transmission bandwidth.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (4)
1. the super narrowband excitation state faraday anomalous dispersion atomic light filter of a communication band, it is characterized in that, described filter comprises: semiconductor laser (1), laser isolator (2), coupling dichroism eyeglass (3), light splitting dichroism eyeglass (4), Rb atom steam bubble (5), magnetic field generator (6), heater (7), analyzer (8), polarizer (9), the quarter-wave plate (10) of 780nm, polarization splitting prism (11), the first photodetector (12), the second photodetector (13), difference engine (14) and frequency stabilization server (15),
Described semiconductor laser (1) is tunable 780nm semiconductor laser, and it is for providing Rb atomic ground state 5
2s
1/2to target excitation state 5
2p
3/2pumping laser;
Described laser isolator (2) sees through for guaranteeing that pumping laser signal is unidirectional, cuts off by the light signal reflecting on rear class optics;
Dichroism eyeglass for described coupling (3) is arranged between described analyzer (8) and Rb atom steam bubble (5), and be positioned on the transmitted light path of described laser isolator (2), it is set to the high transmission of 1529nm light, and to the high reflection of 780nm light, it for reducing as far as possible the loss of flashlight when pumping laser is introduced to filter light path;
Dichroism eyeglass for described light splitting (4) is arranged between described Rb atom steam bubble (5) and polarizer (9), and be positioned on the transmitted light path of described Rb atom steam bubble (5), it is set to the high transmission of 1529nm light, to the high reflection of 780nm light, it is for extracting pump light from filter light path, in order to carry out frequency stabilization in rear class light path, reduce as far as possible the loss of flashlight simultaneously;
Described Rb atom steam bubble (5) is arranged on described coupling dichroism eyeglass (3) reflected light path, and bubble adopts quartz material, and it is set to all possess high-transmission rate at near-infrared 780nm and 1529nm;
It is upper that described magnetic field generator (6) is arranged at described Rb atom steam bubble (5), and it is for generation of the external magnetic field signal for Rb atom steam bubble (5) is acted on;
It is upper that described heater (7) is arranged at described Rb atom steam bubble (5), and it is for controlling the working temperature of described Rb atom steam bubble (5);
Described analyzer (8) and polarizer (9) are arranged at the light path two ends of described Rb atom steam bubble (5), described analyzer (8) is set to mutually orthogonal with polarizer (9), described polarizer (9) is set to allow the flashlight of linear polarization to see through, and makes stray light only have a linear polarization component to see through; Described analyzer (8) be set to by with the mutually orthogonal spurious rays polarized component seeing through through polarizer (9) that filters out of polarizer (9);
The quarter-wave plate (10) of described 780nm, it is arranged on the reflected light path of described light splitting dichroism eyeglass (4), and it is for becoming respectively the linearly polarized light in wave plate main shaft and the angled direction of countershaft by the Left-hand circular polarization component of incident optical signal and right-hand circular polarization component;
Described polarization splitting prism (11) is arranged on the outgoing path of described quarter-wave plate (10), it is for by the linearly polarized light beam splitting in main shaft and the countershaft direction of quarter-wave plate (10) outgoing, outgoing on both direction, thus the left circularly polarized light of light signal and right-hand circular polarization light component are extracted respectively;
Described the first photodetector (12) is for being converted into the aforementioned left circularly polarized light extracting first signal of telecommunication and exporting difference engine (14) to;
Described the second photodetector (13) is for being converted into the aforementioned right-circularly polarized light extracting second signal of telecommunication and exporting difference engine (14) to;
Described difference engine (14) is for carrying out signal subtraction, generated frequency shifted signal by first signal of telecommunication and second signal of telecommunication of input;
Described frequency stabilization server (15) is for according to described frequency offset signals, generation feeds back to the control signal of described semiconductor laser (1), described control signal is used for adjusting the operating frequency of semiconductor laser (1), frequency of amendment skew, thus optical maser wavelength is locked on the position of pumping efficiency maximum.
2. the super narrowband excitation state faraday anomalous dispersion atomic light filter of communication band as claimed in claim 1, it is characterized in that, in the light path of described Rb atom steam bubble (5), described polarizer (9) the relatively other end of Rb atom steam bubble (5) is also provided with tunable 1529nm lasing light emitter (16), and described analyzer (18) the relatively other end of Rb atom steam bubble (5) is also provided with the 3rd photodetector (17);
Described tunable 1529nm lasing light emitter (16) is incident to Rb atom steam bubble (5) for generation of wavelength continually varying flashlight through polarizer (9), thereby for detection of signal optical transmission situation within the scope of one section of continuous wavelength;
Described the 3rd photodetector (17) is for being converted into signal of telecommunication record by the flashlight of analyzer (18) transmission, because signal light wavelength changes continuously, therefore the flashlight of recording occurring continuously transmission just can obtain take wavelength as independent variable, and the curve that transmissivity is value is also transmission spectrum.
3. the super narrowband excitation state faraday anomalous dispersion atomic light filter of communication band as claimed in claim 1, is characterized in that, point optical axis angle at 45 ° of the main shaft of described quarter-wave plate (10) and countershaft and described polarization splitting prism (11).
4. the super narrowband excitation state faraday anomalous dispersion atomic light filter of communication band as claimed in claim 1, is characterized in that, described heater (7) is operated in the arbitrary temp of normal temperature to 200 ℃ for controlling described Rb atom steam bubble (5).
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