CN101241241A - Raman optical amplification atom filtering method and apparatus - Google Patents
Raman optical amplification atom filtering method and apparatus Download PDFInfo
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- CN101241241A CN101241241A CNA2008100468622A CN200810046862A CN101241241A CN 101241241 A CN101241241 A CN 101241241A CN A2008100468622 A CNA2008100468622 A CN A2008100468622A CN 200810046862 A CN200810046862 A CN 200810046862A CN 101241241 A CN101241241 A CN 101241241A
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Abstract
The invention discloses a Raman light amplification atom filtering method and apparatus thereof. The invented method combines Raman light amplification and atom chromatic aberration filtering integrally, improving filtering character and detection sensitivity remarkably, and is used in free space quantum communication and classic laser communication field. The invented device is composed of a continuous wave semiconductor laser, a polarization beamsplitter, a lambda/2 wave plate, a couple of atom steam bubbles, a couple of temperature control modules, a couple of Gelan Thomson edge glasses, a light barrier and a photodetector. According to the invention, relative strength of low-power level signal light in atom steam can be enhanced with ten times by coupling laser action, the filtering working tape width is decreased to MHz level (narrower than normal interference absorbent by 4 magnitude orders), and high rejection ratio (-10<SUP>5</SUP>) and adjustable filtering operating wavelength are provided at the same time.
Description
Technical field:
The present invention relates to the atom filtering method that a kind of Raman light is amplified, also relate to the atom filtering device that a kind of Raman light is amplified simultaneously, more relate to concrete quantum communications, laser radar and classical laser communication etc. need extract the field of faint optical signal in bias light strong, wide spectrum.
Background technology:
Quantum information science is the product that quantum mechanics combines with information science, because Quantum Properties has unique function in message area, guaranteeing information security, increase information capacity, improve arithmetic speed and improving the limit that aspects such as accuracy of detection can break through existing classical information system, its most important applications direction comprises quantum calculation and quantum communications at present.The carrier of information can be single photon in quantum information science, utilizes polarization, phase place or the spin state of the photon classical information of encoding.As an important branch in the quantum information science, the development trend of quantum communications is to realize long distance, high efficiency information transmission.The free space quantum communications can realize the quantum communications that globalize by ground to the communication of star to star, star.
In the receiving trap of free space quantum communication system, the information of single photon need be extracted from the airspace background noise usually.Compare with the single photon of the information of carrying, the bias light of airspace (sunlight, moonlight or starlight) has high relatively light intensity and characteristic broad spectrum.Usually, these backgrounds form optical noise can produce big error code in transmitting information process, therefore, limited the distance of free space quantum communications and the transfer rate of quantum key to a great extent.At document " research of Rb faraday anomalous dispersion wave filter under the single photon detection condition " [Li Ruohong, Sun Xianping, Luo Jun, once tin it, Zhan Mingsheng, Chinese laser, 31,967 (2004)] point out " that if use the interference filter of nm magnitude, the photon signal that carries information can be submerged in the daylight ground unrest fully.
Based on the atomic light filter of atom vapor faraday anomalous dispersion effect, characteristics such as have high permeability, super narrow bandwidth of operation (GHz magnitude), high rejection ratio, frequencies of transmission is adjustable within the specific limits, wide-angle receives, response speed is fast.Therefore, it can be at the narrow band signal a little less than the gating under the stronger wide background noise.As a kind of filter efficiently, atomic light filter has very widely to be used.For example, the remote sensing survey of ocean temperature, daytime middle layer atmospheric temperature characteristic laser radar survey, classical communication field such as laser communication in the atmosphere.
For the free space quantum communications, document " Free-space quantum key distributionwith Rb vapor filters " [Xin Shan, Xianping Sun, Jun Luo, Zheng Tanand Mingsheng Zhan., Applied Physics Letter, 89,191121 (2006)] experiment in has shown the bias light (light that uses existing Rb atom filter method can suppress airspace, starlight, sunlight when moonlight and dusk), use single-photon detector that the polarization encoder single photon signal of gating is measured then, successfully demonstrated the free space quantum cryptography communication.However, the document also shows under some maximum conditions of quantum communications, for example, background condition in direct sunlight, when optics receiving telescope field angle greater than 150 μ rad and do not use the micropore spatial filtering and during the time filtering method, the background noise that the receiving trap of the quantum communications experimental demonstration system of the existing atomic light filter of use detects still may make the bit error rate increase, and therefore, may have influence on the acquisition and the round-the-clock use of safe key.
Summary of the invention:
The objective of the invention is to be to provide a kind of atom filtering method of Raman light amplification, that is: Raman light amplification and atom chromatic dispersion filtering are combined.In the receiving trap of communication system, utilize a branch of coupled laser and atom vapor to interact, in the future the feeble signal light of self-emission device carries out Raman and amplifies, and utilizes the atom vapor dispersion characteristics optionally to suppress background noise and allow feeble signal light is harmless to be passed through.It is wide to press narrow filtering to see through crest line when amplifying feeble signal light, and keeps high rejection ratio.
Another object of the present invention is to be to provide a kind of device of realizing the atom filtering method that Raman light is amplified, this device mainly is made up of two parts, (A) by a continuous wave semiconductor laser emission coupled laser and an atom steam bubble feeble signal light is carried out Raman and amplifies; (B) use the atom steam bubble of two Glan thomson prisms and an externally-applied magnetic field, the flashlight after nondestructively gating amplifies also suppresses the light beyond its wavelength as background noise.Apparatus of the present invention obtain final filtering and see through the peak relative intensity and can surpass original signal light more than ten times, and the maximum halfwidth of live width press narrow to the MHz magnitude, have simultaneously adjustable, the high filtering transmitance of filtering operation wavelength and～10
5Rejection ratio.
To achieve these goals, the present invention has adopted following technical measures:
The invention provides the atom filtering method and the device of a kind of Raman (Raman) light amplification, utilize this method and apparatus, can reduce the bit error rate that causes by background noise in the communication process, solve the problem that safe key obtains that influences above-mentioned.Than existing atom filtering method, the present invention has more superior filtering characteristic, not only can be used for classical laser communication, in the fields such as laser radar, also has the uniqueness that can directly use in the free space quantum communication system.Compare with existing atomic light filter, device based on the inventive method can increase the relative intensity of feeble signal light effectively and press narrow filtering bandwidth of operation, can further reduce the influence of strong, wide spectrum bias light (starlight, moonlight or sunlight) to the feeble signal photodetection, therefore, improved the receiving efficiency of quantum communication system, increase the transfer rate of safe key, increased the communications distance simultaneously, and made all weather operations become possibility.
In classical laser communication system, Raman's process is used in the optical fiber Raman amplifier more, utilizes Transmission Fibers itself as gain media, and by the amplification of coupled laser realization to arbitrary wavelength signals light in the optical fiber window.Therefore, can improve power system capacity, expand frequency efficiency and improve system transmissions speed, increase unrepeatered transmission distance, the loss of compensation of dispersion compensated optical fiber.Different therewith is that the atom filtering method that Raman light proposed by the invention is amplified is that set has utilized the atom vapor Raman light to amplify and two characteristics of chromatic dispersion filtering.Use a branch of coupled laser to affact alkali metal atom and (the present invention relates to K, Rb, Cs) on the steam, population changes on two ground state levels of atom, thereby, atom changes at the polarizability at weak signal light frequency place, and causes the variations in refractive index of weak signal light, obtains the very big enhancing of weak signal light relative intensity at last.The present invention suppresses high, wide spectrum bias light (starlight, moonlight or sunlight) when increasing feeble signal light relative intensity, pressing narrow filtering live width.
The atom filtering method that the Raman light of two characteristics that the present invention has adopted set atom vapor Raman to amplify and chromatic dispersion filters is amplified the steps include:
(a) atom steam bubble carries out Raman's amplification to feeble signal light, affact in the steam bubble on the atom by a branch of coupled laser, make the interior atomic energy level particle population of steam bubble change (being commonly referred to atomic polarization), preestablish working temperature and carry out temperature control.
(b) when other a branch of feeble signal light passed through the steam bubble of this atomic polarization, its refractive index changed.
(c) if coupled laser and weak signal light frequency satisfy atom virtual level two-photon resonance condition, feeble signal light can be exaggerated (that is: being commonly referred to Raman amplifies).
(d) subsequently, the flashlight that is exaggerated is by being added with atom steam bubble and two chromatic dispersion filters that Glan thomson prism is formed in magnetic field outward by another, because the characteristic of atom chromatic dispersion, strong, wide spectrum bias light are suppressed, and keep the relative intensity of amplified signal light constant substantially.
(e) finally obtain the flashlight that relative intensity is enhanced, the live width pressure is narrow, suppressed background noise strong, wide spectrum simultaneously.
In order to realize the method for above-mentioned filtering, the present invention has adopted a kind of atom filtering device of Raman light amplification, and its technical scheme that adopts is as follows:
(A) the atom filtering device of Raman light amplification is made up of a continuous wave semiconductor laser, λ/2 wave plates, a polarization beam apparatus, two Glan thomson prisms, two atom steam bubbles (one of them bubble outside is added with magnetic field), two temperature control modules, a light barrier and photo-detectors, the continuous wave semiconductor laser links to each other with coupled laser, first atom steam bubble links to each other with first temperature control modules, and second atom steam bubble links to each other with second temperature control modules; First atom steam bubble links to each other with the weak signal light of coupled laser and incident, coupled laser is successively by polarization beam apparatus, λ/2 wave plates and first atom steam bubble, and link to each other with light barrier, coupled laser is vertical mutually with weak signal polarisation of light direction, and intersects at certain low-angle co-propagate in first atom steam bubble; The incident of weak signal light is also passed through first atom steam bubble, subsequently successively by first Glan thomson prism, second atom steam bubble, second Glan thomson prism, and incides on the photo-detector; Two Glan thomson prisms, second atom steam bubble keep coaxial with the direction of propagation of flashlight, the optical axis direction of two Glan thomson prisms is vertical mutually, and wherein the optical axis direction of first Glan thomson prism and the polarization direction of flashlight are consistent.
(B) produce coupled laser (power bracket is from 50mW to 500mW) by the continuous wave semiconductor laser, on this light path, coupled laser by polarization beam apparatus, λ/2 wave plates, first atom steam bubble, is blocked by light barrier successively at last.
(C) the feeble signal light of incident (power bracket from the photon counting horizontal signal to the mW magnitude) at first incides first atom steam bubble (atomicity density is regulated by first temperature control modules), and intersect in the zone of action of atom vapor with coupled laser, need be kept at an angle (angular range is: 0.2 °-3 °) simultaneously, influence the reception of weak signal light to avoid coupled laser.
(D) under the effect of coupled laser, the polarizability of atom can change in the sample bubble, thereby causes the variations in refractive index of weak signal light.
(E) when the frequency of coupled laser and intensity satisfy Raman and amplifies condition, can the weak signal light by atom vapor be amplified.The maximum halfwidth of flashlight live width after the amplification reaches secondary Doppler (sub-Doppler) broadening (MHz magnitude) that approaches atomic spectral line, and its relative intensity can surpass more than ten times of original weak signal light.
(F) flashlight after amplifying from the Raman of first atom steam bubble outgoing, (be added with magnetic field outside the bubble through one by two Glan thomson prisms and second atom steam bubble again, atomicity density is regulated by second temperature control modules) the atom chromatic dispersion filter formed, bias light strong, broad spectrum is suppressed, and final optical filtering signals has kept the relative intensity of amplifying signal light constant substantially simultaneously.The center of each device all should keep the light path coaxial with incoming signal light, and simultaneously, the optical axis direction of these two Glan thomson prisms is vertical mutually.Flashlight after the optical filtering is received by photon counter or photo-detector.
Apparatus of the present invention have the following advantages:
(1) enlargement factor of weak signal light is by factors such as the intensity decision of coupled laser, and the relative intensity that adjusting coupled laser intensity can obtain weak signal light is above the enlargement factor more than ten times, thus the sensitivity that raising detects.
(2) scope of application of weak signal light and coupled laser power is bigger, and weak signal light can be from the photon counting horizontal signal to the mW magnitude; And the coupled laser power bracket is from 50mW to 500mW, when depending on actual use to surveying the required enlargement factor of weak signal light.
(3) because the Raman light amplification is relevant with the transition spectral line of atom, maximum half width of the flashlight bandwidth after the amplification and the final filtering that obtains see through the live width at peak near atomic transition spectral line secondary Doppler line broadening (typically being the MHz magnitude).Than narrow approximately 1 magnitude of bandwidth of operation of existing atomic light filter GHz magnitude, than narrow approximately 4 orders of magnitude of bandwidth of operation of commonly used～nm interference filter.
(4) if suitably regulate the frequency of coupled laser, the amplifying signal light frequency also can change thereupon, thereby realizes the final accurate adjustable purpose of filtering signal light frequency of amplifying, and tuning range is the GHz magnitude.
(5) compare with existing atomic light filter, the atom chromatic dispersion filtering characteristic that comprises among the present invention has also kept high rejection ratio (～10 strong, the wide spectrum optical noise
5).
Therefore, that atom filtering method that Raman light provided by the invention is amplified and device can be used to receive better is strong, the faint optical signal under the wide spectrum bias light (starlight, moonlight or sunlight), greatly improve acquisition of signal sensitivity, all be with a wide range of applications in quantum communications or classical laser communication field.Especially, in the quantum communications communication system, can directly use, effectively reduce the communication bit error rate that causes by background noise, reduce 3-4 the order of magnitude, increase the distance and the efficient of communication, and make its round-the-clock operate as normal become possibility.
Description of drawings:
Fig. 1 is a kind of structural representation of atom filtering device of Raman light amplification.
Wherein: 2 is that continuous wave semiconductor laser, 3 is that polarization beam apparatus, 4 is that λ/2 wave plates, 5 and 9 are that atom steam bubble (wherein second steam bubble 9 outer magnetic field that are added with), 6 and 11 is that temperature control modules, 8 and 12 is that Glan thomson prism, 10 is that light barrier, 13 is a photo-detector.
Embodiment:
The atom filtering method that a kind of Raman light of the present invention is amplified below in conjunction with accompanying drawing elaborates.
In the inventive method, 5 pairs of weak signal light of first atom steam bubble 1 carry out Raman and amplify.Temperature control modules 6 is connected with atom steam bubble 5, preestablishes working temperature (scope: 45 ℃-180 ℃, any one temperature spot all can be worked) the trip temperature control (temperature-controlled precision: ± 0.1 ℃) of going forward side by side.Coupled laser 7 is launched by continuous wave semiconductor laser 2, and successively by polarization beam apparatus 3 (extinction ratio is 1000: 1) and λ/2 wave plates 4, intersects in atom steam bubble 5 with weak signal light 1 subsequently.Coupled laser 7 and weak signal light 1 are before entering atom steam bubble 5, and their polarization direction is mutually vertically to satisfy the requirement that Raman amplifies.Under coupled laser 7 effects, with atomic polarization in the steam bubble, weak signal light 1 can be exaggerated through behind the atom steam bubble 5.
According to the invention described above method, and to use the Rb atom vapor to be example, the atom filtering device that Raman light provided by the present invention is amplified is described in further detail.
Apparatus of the present invention are by continuous wave semiconductor laser 2, polarization beam apparatus 3, λ/2 wave plates 4, first temperature control modules 6 and second temperature control modules 11, first atom steam bubble 5 and second atom steam bubble 9, the first Glan thomson prism 8 and the second Glan thomson prism 12, light barrier 10 and photo-detector 13 are formed, continuous wave semiconductor laser 2 links to each other with coupled laser 7, first atom steam bubble 5 links to each other with first temperature control modules 6, second atom steam bubble 9 links to each other with second temperature control modules 11, first atom steam bubble 5 links to each other with the weak signal light 1 of coupled laser 7 and incident, coupled laser 7 is successively by polarization beam apparatus 3, λ/2 wave plates 4 and first atom steam bubble 5, and link to each other with light barrier 10, the polarization direction of coupled laser 7 and weak signal light 1 is vertical mutually, and (angular range is: 0.2 °-3 ° to intersect at certain low-angle in first atom steam bubble 5, all can work in this angular range any point) co-propagate, 1 incident of weak signal light is also passed through first atom steam bubble 5, subsequently successively by the first Glan thomson prism 8, second atom steam bubble 9, the second Glan thomson prism 12, incide at last on the photo-detector 13, the first Glan thomson prism 8 and the second Glan thomson prism 12, second atom steam bubble 9 keeps coaxial with the direction of propagation of weak signal light 1, the first Glan thomson prism 8, the optical axis direction of the second Glan thomson prism 12 is vertical mutually, and wherein the polarization direction of the optical axis direction of the first Glan thomson prism 8 and weak signal light 1 is consistent.
What continuous wave semiconductor laser 2 adopted is the TA-100 laser instrument of TOPTICA company, output power is adjustable (reaching as high as 500mW), the linear polarization laser bandwidth representative value of output is MHz, and wavelength tuning is used to provide coupled laser 7 near Rb atomic resonance line 780nm.
The narrow band polarization beam splitter that polarization beam apparatus 3 is produced for COHERENT company, extinction ratio is 1000: 1, transparent surface is coated with the 780nm anti-reflection film.
The wavelength of λ/2 wave plates 4 is 780nm, and coupled laser 7 passes through from λ/2 wave plates, 4 central vertical, regulates the optical axis of λ/2 wave plates 4 and the angle of coupled laser 7 polarization directions, can change the polarization direction of inciding the coupled laser 7 in first atom steam bubble 5.
First atom steam bubble 5 is the cylindrical glass bubble, and the long scope of bubble is 5mm-200mm, and diameter range is 5mm-50mm, and two end faces of bubble must keep parallel fully, are filled with alkaline metal Rb atom vapor in the bubble.
Second atom steam bubble 9, the same substantially with size with first atom steam bubble, 5 profiles, material, different is, the outer permanent magnet that is added with of bubble, it produces and weak signal light 1 direction of propagation parallel magnetic field (the magnetic field intensity scope is 0.01Tesla-0.35Tesla).
First temperature control modules 6, second temperature control modules 11 are the temperature controller that holy inferior instrument and meter for automation company produces, its model all is DB-1-111, link to each other with first atom steam bubble 5, second atom steam bubble 9 respectively, can in advance working temperature (for example be configured, range of set temperature is in apparatus of the present invention: 45 ℃-180 ℃), be used for controlling the number density of work atoms in corresponding first atom steam bubble 5, second atom steam bubble 9.
The first Glan thomson prism 8, the second Glan thomson prism 12 all use the product (being numbered 43-6899) of COHERENT company, and its extinction ratio is 10
5, transparent surface plating 780nm anti-reflection film, weak signal light 1 must pass through from the central vertical of the first Glan thomson prism 8, the second Glan thomson prism 12.
Light barrier 10 is surperficial blacking metal plate, is used to block the coupled laser 7 from 5 outgoing of first atom steam bubble.
Photo-detector 13 is the varying strength needs according to weak signal light, selects to use single photon counting module (EG﹠amp; The SPCM-AQ series of G company) or photodiode (S5821 of HAMAMATSU company).
Connection in the atom filtering device that Raman light of the present invention is amplified is described in detail as follows:
Form by continuous wave semiconductor laser 2, polarization beam apparatus 3, λ/2 wave plates 4, first atom steam bubble 5 and second atom steam bubble 9 (wherein second atom steam bubble, the 9 outer magnetic fields that are added with), first temperature control modules 6 and second temperature control modules 11, the first Glan thomson prism 8 and the second Glan thomson prism 12, light barrier 10 and photo-detector 13.Coupled laser 7 then, is blocked successively by polarization beam apparatus 3, λ/2 wave plates 4 and first atom steam bubble 5, and by light barrier 10 by 2 emissions of continuous wave semiconductor laser.The weak signal light 1 of incident at first enters first atom steam bubble 5, and Raman amplifies the back outgoing and successively by the first Glan thomson prism 8, second atom steam bubble 9, the second Glan thomson prism 12, incides at last on the photo-detector 13.The polarization direction of coupled laser 7 and weak signal light 1 is vertical mutually, intersects in first atom steam bubble 5 and transmission in the same way with certain low-angle.First temperature control modules 6 links to each other with first atom steam bubble 5, regulates the atomicity density in the bubble; Second temperature control modules 11 links to each other with second atom steam bubble 9, controls temperature in second atom steam bubble 9, to guarantee the number density of the work atom in second atom steam bubble 9.
The workflow of the atom filtering device that Raman light of the present invention is amplified is:
Coupled laser 7 is produced by continuous wave semiconductor laser 2, and it is vertical with the polarization direction of weak signal light 1 that polarization beam apparatus 3 and λ/2 wave plates 4 are united the polarization direction that is used to regulate coupled laser 7, has guaranteed the pacing items of Raman light amplification.Two orthogonal coupled lasers 7 in polarization direction and weak signal light 1 are gone into to inject in the zone of action of first atom steam bubble 5 at a certain angle and are intersected and along equidirectional propagation, its direction of propagation, back that interacts all remains unchanged.Incident angle between coupled laser 7 and the weak signal light 1 is with the zone that increases both effects and do not influence the reception of weak signal light 1 and determine.The temperature of first steam bubble 5 is regulated by first temperature control modules 6.
The first Glan thomson prism 8 is vertical mutually with the optical axis of the second Glan thomson prism 12, and they and second atom steam bubble 9 and second temperature control modules 11 be common forms an atom chromatic dispersion filter.The optical axis direction of the first Glan thomson prism 8 must be consistent with the polarization direction of weak signal light 1, and vertical with the polarization direction of coupled laser 7.So, by behind first atom steam bubble 5, have only the weak signal light 1 after the amplification can enter second atom steam bubble 9.In second atom steam bubble 9, because the dispersion characteristics of atom vapor, background noise strong, broad spectrum is suppressed, and simultaneously, the amplifying signal light transmission is not exerted an influence.Use photo-detector 13 to receive the final weak signal light 1 that filters, and export after being converted to electric signal.
The atom filtering device that all amplifies with Rb atom Raman light in the foregoing description is an example, in actual applications, the alkaline metal that the present invention relates to (also comprising K and Cs) atom vapor should be selected the intensity in optical device, suitable temperature Control work point and magnetic field of laser instrument, the plating mould of corresponding atomic transition wavelength respectively in concrete enforcement.
Claims (5)
1, a kind of atom filtering method of Raman light amplification the steps include:
(a) atom steam bubble carries out Raman to weak signal light and amplifies, and affacts in the steam bubble on the atom by a branch of coupled laser, makes that atomic ground state energy level particle population changes in the steam bubble, preestablishes working temperature and carries out temperature control;
(b) other a branch of weak signal light is through the steam bubble of this atomic polarization, and refractive index changes;
When (c) coupled laser and weak signal light frequency satisfied atom virtual level two-photon resonance condition, weak signal light can be exaggerated;
(d) flashlight that is exaggerated is by being added with atom steam bubble and two chromatic dispersion filters that Glan thomson prism is formed in magnetic field outward by another, because the characteristic of atom chromatic dispersion, strong, wide spectrum bias light are suppressed, keep the relative intensity of amplified signal light constant;
(e) obtain the flashlight that the light relative intensity is enhanced, the live width pressure is narrow, suppressed background noise strong, wide spectrum simultaneously.
2, a kind of atom filtering device of Raman light amplification, it is made up of continuous wave semiconductor laser (2), polarization beam apparatus (3), λ/2 wave plates (4), temperature control modules (6) and (11), atom steam bubble (5) and (9), Glan thomson prism (8) and (12), light barrier (10) and photo-detector (13), it is characterized in that continuous wave semiconductor laser (2) links to each other with coupled laser (7), first atom steam bubble (5) links to each other with first temperature control modules (6), and second atom steam bubble (9) links to each other with second temperature control modules (11).
3, the atom filtering device of a kind of Raman light amplification according to claim 2, its technical characterictic is: first atom steam bubble (5) links to each other with the weak signal light (1) of coupled laser (7) and incident, coupled laser (7) is successively by polarization beam apparatus (3), λ/2 wave plates (4) and first atom steam bubble (5), and link to each other with light barrier (10), coupled laser (7) is vertical mutually with the polarization direction of weak signal light (1), intersects and co-propagate in first atom steam bubble (5) with 0.2 ° of-3 ° of angle.
4, the atom filtering device of a kind of Raman light amplification according to claim 2, it is characterized in that: weak signal light (1) incides first atom steam bubble (5), Raman amplifies the back outgoing and successively by the first Glan thomson prism (8), second atom steam bubble (9), the second Glan thomson prism (12), incides at last on the photo-detector (13).
5, the atom filtering device of a kind of Raman light amplification according to claim 2, it is characterized in that: the first Glan thomson prism (8), the second Glan thomson prism (12), second atom steam bubble (9) keep coaxial with the direction of propagation of weak signal light (1), the optical axis direction of the first Glan thomson prism (8), the second Glan thomson prism (12) is vertical mutually, and wherein the polarization direction of the optical axis direction of the first Glan thomson prism (8) and weak signal light (1) is consistent.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101656537B (en) * | 2009-07-21 | 2012-04-04 | 中国科学院武汉物理与数学研究所 | Method and device for preparing multi-pulse interference Ramsey-CPT stripe |
| CN102709802A (en) * | 2012-06-05 | 2012-10-03 | 中国科学院武汉物理与数学研究所 | Excited state atom filter receiving device for pumping laser atom frequency stabilization |
| CN102879970A (en) * | 2012-09-28 | 2013-01-16 | 华东师范大学 | Atomic frequency shifter and frequency shifting method thereof |
| CN106444097A (en) * | 2016-11-16 | 2017-02-22 | 浙江大学城市学院 | Ultra-narrow line width atom light filter based on Rb atom 420nm transition |
| US10795171B2 (en) | 2016-07-27 | 2020-10-06 | Wuhan Institute Of Physics And Mathematics Chinese Academy Of Sciences | Optical-fiber atomic light-filtering apparatus |
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| JP3858451B2 (en) * | 1998-06-03 | 2006-12-13 | Ｋｄｄｉ株式会社 | Control signal superimposing device |
| CN1095548C (en) * | 1999-12-30 | 2002-12-04 | 中国科学院武汉物理与数学研究所 | Active rubidium atom resonance light filter |
| CN1295896C (en) * | 2003-11-11 | 2007-01-17 | 中国科学院武汉物理与数学研究所 | Space quantum communication unit using atom light filter |
| CN100386692C (en) * | 2006-04-29 | 2008-05-07 | 中国科学院武汉物理与数学研究所 | Multi-channel photon switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101656537B (en) * | 2009-07-21 | 2012-04-04 | 中国科学院武汉物理与数学研究所 | Method and device for preparing multi-pulse interference Ramsey-CPT stripe |
| CN102709802A (en) * | 2012-06-05 | 2012-10-03 | 中国科学院武汉物理与数学研究所 | Excited state atom filter receiving device for pumping laser atom frequency stabilization |
| CN102879970A (en) * | 2012-09-28 | 2013-01-16 | 华东师范大学 | Atomic frequency shifter and frequency shifting method thereof |
| US10795171B2 (en) | 2016-07-27 | 2020-10-06 | Wuhan Institute Of Physics And Mathematics Chinese Academy Of Sciences | Optical-fiber atomic light-filtering apparatus |
| CN106444097A (en) * | 2016-11-16 | 2017-02-22 | 浙江大学城市学院 | Ultra-narrow line width atom light filter based on Rb atom 420nm transition |
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