CN106681013A - Method and equipment for constructing filtering-frequency reflecting mirror - Google Patents
Method and equipment for constructing filtering-frequency reflecting mirror Download PDFInfo
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- CN106681013A CN106681013A CN201710198173.2A CN201710198173A CN106681013A CN 106681013 A CN106681013 A CN 106681013A CN 201710198173 A CN201710198173 A CN 201710198173A CN 106681013 A CN106681013 A CN 106681013A
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- 238000002156 mixing Methods 0.000 claims abstract description 43
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- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3536—Four-wave interaction
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to a method and equipment for constructing a filtering-frequency reflecting mirror. The invention aims at solving the technical problems that the existing planar reflecting mirror does not have a frequency screening function, and if a resonance cavity technology is utilized for frequency selection, the system is complex and the operating difficulty is large. The invention adopts the technical scheme that an implementation method of the filtering-frequency reflecting mirror is characterized in that two beams of coupling lights with same frequency, polarization and power penetrate through a hot-alkaline metal-atom steam chamber in an opposite and colinear manner so as to form standing waves in the hot-alkaline metal-atom steam chamber; another beam of signal light with continuously-variable frequency enters to penetrate through the hot-alkaline metal-atom steam chamber in the direction opposite to the coupling light and by an incident angle less than 0.6 degree; and the signal light with the frequency meeting the condition of dual-photon resonant transition and the coupling light generate a four-wave mixing effect, and reversely generate a beam of four-wave mixing signal reflecting light with the frequency same with that of the signal light, and incident signal light with other frequency components penetrates through the hot-alkaline metal-atom steam chamber along the original incident direction, so that the function of the filtering-frequency reflecting mirror is achieved.
Description
Technical field
The present invention relates to a kind of method and apparatus for building filter frequency reflecting mirror.
Background technology
Plane mirror is the commonly used a kind of optics of Jing in Experiments of Optics, is mainly used in changing the direction of propagation of light
Or light intensity magnitude.According to wave-length coverage, plane mirror can be divided into Single wavelength reflecting mirror and broadband mirrors；According to reflectance
Size, can be divided into total reflective mirror, the reflecting mirror of 50/50 beam splitter, anti-reflection mirror and any reflectance；According to reflection angle, 0 can be divided into
Degree reflecting mirror, 45 degree of reflecting mirrors etc..
Plane mirror of the prior art mainly by realizing in lens surface plated film, but after plated film, typically
A kind of demand of condition can only be met, function phase is to single.For example, a branch of light reflected by total reflective mirror is transformed to semi-transparent semi-reflecting
When, then need for total reflective mirror to be replaced by 50/50 beam splitter, it is also possible to realize using optics such as wave plate and polarizing prisms above-mentioned
Function, but the device count in light path is increased, adjust loaded down with trivial details, it is unfavorable for the integrated of system.Other more important point is, one
In a little experiments, need to select the frequency in light beam, but receive because the plated film precision of traditional optics can only achieve
Rice magnitude, it is impossible to which light of the frequency in order of megahertz is selected, therefore existing optics does not possess frequency screening work(
Energy.Although line frequency can be entered using resonator cavity technology to select, it is related to lock the technologies such as chamber, frequency stabilization, system complex, to experiment
Environmental requirement is harsh, and operation difficulty is larger.
The content of the invention
Present invention aim to address existing plane mirror is not possessed frequency screening function, is entered using resonator cavity technology
Line frequency selects the system complex for existing and the big technical problem of operation difficulty, there is provided a kind of method of structure filter frequency reflecting mirror and
Equipment.
To solve above-mentioned technical problem, the technical solution adopted in the present invention is：A kind of method for building filter frequency reflecting mirror,
Comprise the steps：
1) the first polarization splitting prism and second are respectively provided with the light path entrance port of thermokalite metallic atom steam chest both sides
Polarization splitting prism, arranges the at the light path entrance port of the first polarization splitting prism and any side of the second polarization splitting prism
One 45 ° of total reflective mirrors, enable flashlight opposing coupler light direction with the incident angles less than 0.6 ° and pass through thermokalite metallic atom vapour
Room；
2) by two beam frequencies, polarization and the power identical coupling light difference polarization splitting prisms of Jing first, the second polarization point
To thermokalite metallic atom steam chest is collinearly passed through, in thermokalite metallic atom steam chest standing wave being formed after light refraction by prism；Will be another
Beam frequency continually varying flashlight opposing coupler light direction Jing after the one 45 ° of total reflective mirror reflection is entered with the angle of incidence less than 0.6 °
It is shot through overheated alkali metal atom steam chest；Meet two-photon resonance transition conditions when flashlight is frequency scanned to the frequency of coupling light
When, four-wave mixing effect is produced, while reversely producing a branch of frequency identical four-wave mixing flashlight, the four-wave mixing flashlight
Reflection direction with coupling light direction formed angle of reflection and flashlight relative to coupling light angle of incidence size it is identical, direction phase
Instead, the flashlight of other incident frequency contents passes through thermokalite metallic atom steam chest along former incident direction, anti-so as to realize filter frequency
Penetrate mirror function.
Further, filled with Cs atom steam in the thermokalite metallic atom steam chest；The coupling light is wavelength 894.5nm
And the laser of continuously-tuning, its frequency effect is in Cs atom D1 line ground state Fg=4 to excited state Fe=4 energy level transition；It is described
Flashlight is the laser of wavelength 894.5nm and continuously-tuning, and its frequency effect is in Cs atom D1 line ground state Fg=3 to excited state
Fe=4 energy level transition and continuous scanning, coupling light, flashlight and Cs atom act on forming the transparent energy level knot of Λ type electromagnetically induceds
Structure.
Further, the flashlight is 0.43 ° relative to the incidence angle θ of coupling light direction.
It is a kind of using above-mentioned structure filter frequency mirror approach equipment, including filter frequency mirror system, signal light system and
Detection system；
The filter frequency mirror system includes the first semiconductor laser, the first optoisolator, beam splitter, the first half-wave
Piece, the 2nd 45 ° of total reflective mirror, the second half-wave plate and by the first polarization splitting prism, the second polarization splitting prism, thermokalite metal raw
The filter frequency reflecting mirror that sub- steam chest and the one 45 ° of total reflective mirror are constituted, the first semiconductor laser is coupling radiant, the first quasiconductor
The first optoisolator and beam splitter are sequentially provided with the emitting light path of laser instrument, in the light path of beam splitter transmission first is sequentially provided with
Half-wave plate and the first polarization splitting prism, the light path of beam splitter reflection is provided with the 2nd 45 ° of total reflective mirror, the 2nd 45 ° of total reflective mirror
The second half-wave plate and the second polarization splitting prism, the first polarization splitting prism and the second polarization spectro are sequentially provided with reflected light path
The reflected light path of prism is provided with thermokalite metallic atom steam chest, and first is arranged at the light path entrance port of the first polarization splitting prism
45 ° of total reflective mirrors enable flashlight opposing coupler light direction and pass through thermokalite metallic atom steam chest with the incident angles less than 0.6 °；
The signal light system includes the second semiconductor laser, the second optoisolator, the 3rd half-wave plate and the 3rd polarization
Amici prism, the second semiconductor laser is signal radiant, and the is sequentially provided with the emitting light path of the second semiconductor laser
Two optoisolators, the 3rd half-wave plate and the 3rd polarization splitting prism；
The detection system includes the first photodetector, the second photodetector and digital storage oscilloscope, the first light
Electric explorer is located at the one 45 ° of total reflective mirror of Jing and reflects and sequentially pass through thermokalite metallic atom steam chest and the second polarization splitting prism
In light path, the second photodetector is located at the light path of the four-wave mixing signaling reflex light for passing back through the first polarization splitting prism
On, the signal output part of the first photodetector and the second photodetector is connected with digital storage oscilloscope jointly.
Further, the equipment also includes temperature control instrument, and the temperature control instrument is located at the periphery of thermokalite metallic atom steam chest and uses
In the temperature for controlling and showing thermokalite metallic atom steam chest, the temperature of thermokalite metallic atom steam chest is 30-70 degree Celsius.
Further, the temperature of the thermokalite metallic atom steam chest is 64 degrees Celsius.
Further, the two ends end face of the thermokalite metallic atom steam chest is coated with the anti-reflection film that relative wavelength is 894.5nm,
Wrap up in the μ paper tinsels that have three layers in the side of thermokalite metallic atom steam chest.
Further, the first photodetector and the second photodetector difference BNC wires of Jing the first and the 2nd BNC wires
Digital storage oscilloscope is connected to, for showing detectable signal and data storage, the trigger of digital storage oscilloscope is by the
Two semiconductor lasers are provided.
Further, the reflectance of the filter frequency reflecting mirror can be adjusted by adjusting the second half-wave plate.
The invention has the beneficial effects as follows：By the achievable reflectance continuously adjustabe of the present invention, reflection efficiency height and width bandwidth
Filter frequency reflector apparatus, the device multichannel quantum information Store, quantum logic door operation and all-optical switch etc. research lead
Domain has important using value.
1st, the present invention has frequency selection：I.e. under standing wave coupling optical condition, with light frequency is coupled two-photon is met
The flashlight of the frequency of resonance condition can be reflected, and the flashlight of other frequency contents then continues to transmit medium, therefore
Serve filter frequency selection；
The reflectance of the filter frequency reflecting mirror that the 2nd, the present invention builds being capable of consecutive variations：I.e. by adjusting the strong of backward coupling light
Degree, it is possible to achieve the continuous control to incoming signal light so as to which reflectance is from 0 consecutive variations to maximum；
3rd, the filter frequency reflecting mirror that the present invention builds has the reflection efficiency of 40%-60%；
4th, apparatus of the present invention core system is simple and compact for structure, it is easy to which miniaturization is integrated；
5th, the method for the present invention may extend to the system that other light and Three-level Atom interact.
Description of the drawings
Fig. 1 is the structural representation of present invention filter frequency reflecting mirror；
Fig. 2 is the structural representation of present device；
In figure：The semiconductor lasers of 1- first, the optoisolators of 2- first, 3- beam splitters, the half-wave plates of 4- first, 5- first is inclined
Shake Amici prism, the 2nd 45 ° of total reflective mirror of 6-, the half-wave plates of 7- second, the polarization splitting prisms of 8- second, 9- thermokalite metallic atom vapour
Room, 10- temperature control instruments, the semiconductor lasers of 11- second, the optoisolators of 12- second, the half-wave plates of 13- the 3rd, the polarizations point of 14- the 3rd
Light prism, the one 45 ° of total reflective mirror of 15-, the photodetectors of 16- first, the photodetectors of 17- second, the BNC lines of 18- the, 19-
2nd BNC lines, 20- digital storage oscilloscopes；
Fig. 3 is light field action Cs atom energy level transition schematic diagram in the present invention；
Fig. 4 is the normalized transmitted signal strength spectrogram in the present invention after the change under coupled field power condition；
Fig. 5 is the normalized reflected signal strength spectrogram in the present invention after the change under coupled field power condition；
Fig. 6 is the changing trend diagram of the reflection efficiency with flashlight incident angle of present invention filter frequency reflecting mirror；
Fig. 7 is the changing trend diagram of the reflection efficiency with Cs atom steam chest temperature change of present invention filter frequency reflecting mirror；
Fig. 8 is the reflected signal spectrogram in the present invention under different coupling light frequency off resonances.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in figure 1, the method that a kind of structure in the present embodiment filters frequency reflecting mirror, comprises the steps：
1) the first polarization splitting prism 5 and are respectively provided with the light path entrance port of the both sides of thermokalite metallic atom steam chest 9
Two polarization splitting prisms 8, at the light path entrance port of the first polarization splitting prism 5 and any side of the second polarization splitting prism 8
Arranging the one 45 ° of total reflective mirror 15 enables flashlight opposing coupler light direction with the incident angles less than 0.6 ° through thermokalite metal
Atom steam chest 9；
2) two beam frequencies, polarization and the first polarization splitting prisms of power identical coupling light difference Jing 5, second are polarized and is divided
To thermokalite metallic atom steam chest 9 is collinearly passed through, standing wave being formed in thermokalite metallic atom steam chest 9 after the refraction of light prism 8；Will be another
A branch of frequency continually varying flashlight Jing after the one 45 ° of total reflective mirror 15 reflects opposing coupler light direction with the incidence less than 0.6 °
Angle is incident to pass through thermokalite metallic atom steam chest 9；Meet two-photon resonance jump when flashlight is frequency scanned to the frequency of coupling light
When moving condition, four-wave mixing effect is produced, while reversely producing a branch of frequency identical four-wave mixing flashlight, the four-wave mixing
The reflection direction of flashlight with coupling light direction formed angle of reflection and flashlight relative to coupling light angle of incidence size it is identical,
In opposite direction, the flashlight of other incident frequency contents passes through thermokalite metallic atom steam chest 9 along former incident direction, so as to realize
Filter frequency mirror function.
As shown in Fig. 2 the equipment that the method for filter frequency reflecting mirror is built in a kind of use above-described embodiment, it is characterised in that：
Including filter frequency mirror system, signal light system and detection system；
The filter frequency mirror system include the first semiconductor laser 1, the first optoisolator 2, beam splitter 3, the first half
The 4, the 2nd 45 ° of total reflective mirror 6 of wave plate, the second half-wave plate 7 and by the first polarization splitting prism 5, the second polarization splitting prism 8, thermokalite
The filter frequency reflecting mirror that metallic atom steam chest 9 and the one 45 ° of total reflective mirror 15 are constituted, the first semiconductor laser 1 is coupling radiant,
The first optoisolator 2 and beam splitter 3, the light path of the transmission of beam splitter 3 are sequentially provided with the emitting light path of the first semiconductor laser 1
On be sequentially provided with the first half-wave plate 4 and the first polarization splitting prism 5, the light path of the reflection of beam splitter 3 is provided with the 2nd 45 ° of total reflective mirror
The second half-wave plate 7 and the second polarization splitting prism 8, the first polarization point are sequentially provided with the reflected light path of the 6, the 2nd 45 ° of total reflective mirror 6
The reflected light path of the polarization splitting prism 8 of light prism 5 and second is provided with the thermokalite metallic atom vapour of internal-filling alkali metal atomic medium
Room 9, arranging the one 45 ° of total reflective mirror 15 at the light path entrance port of the first polarization splitting prism 5 makes flashlight opposing coupler light side
To can with less than 0.6 ° incident angles pass through thermokalite metallic atom steam chest 9；
The signal light system includes the second semiconductor laser 11, the second optoisolator 12, the 3rd half-wave plate 13 and the
Three polarization splitting prisms 14, the second semiconductor laser 11 is signal radiant, the emitting light path of the second semiconductor laser 11
On be sequentially provided with the second optoisolator 12, the 3rd half-wave plate 13 and the 3rd polarization splitting prism 14；
The detection system includes the first photodetector 16, the second photodetector 17 and digital storage oscilloscope 20,
First photodetector 16 is located at that the one 45 ° of total reflective mirror 15 of Jing reflects and to sequentially pass through thermokalite metallic atom steam chest 9 and second inclined
Shake in the light path of Amici prism 8, the second photodetector 17 is located at the four-wave mixing letter for passing back through the first polarization splitting prism 5
In the light path of number reflected light, the signal output part of the first photodetector 16 and the second photodetector 17 is connected with numeral jointly
Memory oscilloscope 20.
The equipment also includes temperature control instrument 10, and the temperature control instrument 10 is located at the periphery of thermokalite metallic atom steam chest 9 to be used to control
The temperature of system and display thermokalite metallic atom steam chest 9, the temperature of thermokalite metallic atom steam chest 9 is 30-70 degree Celsius.
Embodiment 1
The method that a kind of structure in the present embodiment filters frequency reflecting mirror, comprises the steps：1) filled with Cs atom steam
The both sides of thermokalite metallic atom steam chest 9 light path entrance port at be respectively provided with the first polarization splitting prism 5 and the second polarization spectro
Prism 8, arranges the one 45 ° of total reflective mirror 15 at the light path entrance port of the first polarization splitting prism 5, adjusts the one 45 ° of total reflective mirror
15 enable flashlight opposing coupler light direction passes through thermokalite metallic atom steam chest 9 with 0.43 ° of incident angles；2) by two beams frequency
Rate is identical with polarization, the coupling light of the milliwatt of power 20, the wavelength 894.5nm and continuously-tuning difference polarization splitting prisms of Jing first
5th, to collinearly passing through thermokalite metallic atom steam chest 9 after the second polarization splitting prism 8 reflects, the frequency effect of two beams coupling light in
Cs atom D1 line ground state Fg=4 to excited state Fe=4 energy level transition, forms standing wave in thermokalite metallic atom steam chest 9；Will be another
The one 45 ° of total reflective mirror 15 of flashlight Jing of a branch of frequency consecutive variations, the microwatt of power 300, wavelength 894.5nm and continuously-tuning
Opposing coupler light direction passes through thermokalite metallic atom steam chest 9, the frequency effect of flashlight with 0.43 ° of incident angles after refraction
In Cs atom D1 line ground state Fg=3 to excited state Fe=4 energy level transition and continuous scanning, in coupling light, flashlight and Cs atom
The transparent level structure of Λ type electromagnetically induceds is formed under effect；Meet two-photon when flashlight is frequency scanned to the frequency of coupling light
During resonant transition condition, four-wave mixing effect is produced, while reversely producing a branch of frequency identical four-wave mixing flashlight, this four
The reflection direction of wave mixing flashlight is big relative to the angle of incidence of coupling light with the angle of reflection and flashlight that couple light direction formation
Little identical, in opposite direction, the flashlight of other incident frequency contents passes through thermokalite metallic atom steam chest 9 along former incident direction,
So as to realize filtering frequency mirror function.
The equipment of filter frequency mirror approach is built in example using above-mentioned applying, including filters frequency mirror system, signal light system
And detection system；
The filter frequency mirror system include the first semiconductor laser 1, the first optoisolator 2,50/50 beam splitter 3, the
The 4, the 2nd 45 ° of total reflective mirror 6 of half of wave plate, the second half-wave plate 7, temperature controller 10 and polarized point by the first polarization splitting prism 5, second
The filter frequency reflecting mirror that light prism 8, thermokalite metallic atom steam chest 9 and the one 45 ° of total reflective mirror 15 are constituted, adopt output wavelength for
, used as coupling radiant, first semiconductor laser 1 goes out for 894.5nm, the first semiconductor laser 1 of frequency continuously-tuning
Penetrate in light path and be sequentially provided with the first optoisolator 2 and 50/50 beam splitter 3, couple light Jing the first optoisolators 2 and 50/50 beam splitting
It is divided into power identical two-beam after device 3, the first half-wave plate 4 and the first polarization point is sequentially provided with the light path of the transmission of beam splitter 3
Light prism 5, the light path of the reflection of beam splitter 3 is provided with the 2nd 45 ° of total reflective mirror 6, through 50/50 beam splitter 3 and the first half-wave plate 4 simultaneously
For front to coupling light, the light that Jing beam splitters 3 reflect is backward coupling light to the coupling light of the reflection of the first polarization splitting prisms of Jing 5,
Backward coupling optical path is provided with the 2nd 45 ° of total reflective mirror 6, and on the reflected light path of the 2nd 45 ° of total reflective mirror 6 the second half-wave plate is sequentially provided with
7 and second polarization splitting prism 8, the first polarization splitting prism 5 and the second polarization splitting prism 8 reflected light path be provided with fill
The thermokalite metallic atom steam chest 9 of Cs atom medium, in the periphery of thermokalite metallic atom steam chest 9 temperature controller 10 is provided with；Forward direction is coupled
Light and backward coupling light are all from the first semiconductor laser 1, therefore two-beam frequency is identical, and polarization direction is identical, by adjusting
The first half-wave plate 4 and the second half-wave plate 7 are saved, makes the power of two-beam identical, i.e. Pc2=Pc1=20 milliwatts, two-beam superposition shape
Into standing wave coupled field；The one 45 ° of total reflective mirror 15 is arranged at the light path entrance port of the first polarization splitting prism 5 makes flashlight relative
Coupling light direction can pass through thermokalite metallic atom steam chest 9 with 0.43 ° of incident angles；
The signal light system includes the second semiconductor laser 11, two optoisolators 12, the 3rd half-wave plate 13 and the 3rd
Polarization splitting prism 14, adopt output wavelength for 894.5nm, frequency continuously-tuning the second semiconductor laser 11 as letter
Number radiant, is sequentially provided with the second optoisolator 12, the and of the 3rd half-wave plate 13 on the emitting light path of the second semiconductor laser 11
3rd polarization splitting prism 14；The light that second semiconductor laser 11 sends is through the second optoisolator 12, the 3rd half-wave plate 13
With the 3rd polarization splitting prism 14, the light of the horizontal polarization of the transmission of the 3rd polarization splitting prisms of Jing 14 as flashlight, by adjusting
Saving the 3rd half-wave plate 13 makes the power P of flashlights=300 microwatts；Made through the first polarization by adjusting the one 45 ° of total reflective mirror 15
The flashlight of Amici prism 5 relative to couple light direction with 0.43 ° of angle of incidence enter thermokalite metallic atom steam chest 9, and from
Second polarization splitting prism 8 is transmitted into the first photodetector 16；
The detection system includes the first photodetector 16, the second photodetector 17 and digital storage oscilloscope 20；
First photodetector 16 is located at that the one 45 ° of total reflective mirror 15 of Jing reflects and to sequentially pass through thermokalite metallic atom steam chest 9 and second inclined
Shake in the light path of Amici prism 8, the first photodetector 16 pairs is detected through the flashlight of thermokalite metallic atom steam chest 9,
The frequency detuning Δ of the coupling light that the semiconductor lasers of Jing first send also is monitored simultaneouslyc；Second photodetector 17 is located at instead
To in the light path through the four-wave mixing signaling reflex light of the first polarization splitting prism 5, the four-wave mixing for detecting reflection is believed
Number intensity with flashlight frequency detuning change；The signal output part of the first photodetector 16 and the second photodetector 17 point
Not Tong Guo a BNC lines 18 and the 2nd BNC lines 19 be connected to the signal input part of digital storage oscilloscope 20, two photodetections
Device is direct current detector, and performance parameter is identical, and the signal for detecting is input into stored digital and shows by BNC wires respectively
Show and gathered data in ripple device 20, the trigger of digital storage oscilloscope 20 is provided by the second semiconductor laser 11.
In the present embodiment, the length of thermokalite metallic atom steam chest 9 is 75mm, at the two ends end of thermokalite metallic atom steam chest 9
Face is coated with the anti-reflection film that wavelength is 894.5nm, can reduce transmission and reflected signal light and be produced by glass surface when through steam chest
Reflection loss, while wrapping up in the μ paper tinsels that have three layers in the side of thermokalite metallic atom steam chest 9, maskable external magnetic field is to medium in steam chest
The impact of energy level；The temperature of thermokalite metallic atom steam chest 9 is 64 degrees Celsius.
Fig. 3 acts on the schematic diagram of Cs atom energy level transition for light field.In figure, forward direction coupling optical frequencyc1With backward coupling
Closing light frequencies omegac2It is identical, i.e. ωc1=ωc2, by the frequency lock of two coupling light in Cs atom D1 lines ground state 62S1/2, Fg=4
To excited state 62P1/2, FeNear=4 energy level transition, the frequency detuning for coupling light relative atom resonance centre is Δc, Δc=
ωc1-ω44, ω44For Cs atom energy level Fg=4 arrive Fe=4 jump frequency；Signal light frequency is in Cs atom D1 line ground state
62S1/2, Fg=3 to excited state 62P1/2, Fe=4 resonance centre scanning, the frequency detuning of flashlight relative atom resonance centre
For Δs, Δs=ωs-ω34, ω34For Cs atom energy level Fg=3 arrive Fe=4 jump frequency, flashlight and coupling light and atom
Interact, define the transparent level structure of Λ type three-level electromagnetically induceds.
Fig. 4 is that under conditions of the present embodiment, when changing backward coupled optical power, the normalization transmission signal of flashlight is strong
Degree spectrogram.In figure：(1) it is backward coupled optical power Pc2When=0, the normalization transmitted signal strength T of flashlight is with signal optical frequency
Rate off resonance ΔsChange curve；(2) it is equal to for backward coupled optical power front to coupled optical power half, i.e. Pc2=0.5Pc1When,
The normalization transmitted signal strength T of flashlight is with flashlight frequency detuning ΔsChange curve；(3) it is backward coupled optical power
Equal to front to coupled optical power, i.e. Pc2=Pc1When, the normalization transmitted signal strength T of flashlight is with flashlight frequency detuning Δs
Change curve；First photodetectors of normalization transmitted signal strength T=Jing 16 of flashlight detect transmission signal light intensity
The one 45 ° of reflecting mirror 15 of degree/Jing is reflected into the signal light intensity of Cs atom steam chest 9；Signal light frequency is in Cs atom D1 line bases
State 62S1/2, Fg=3 to excited state 62P1/2, Fe=4 energy level transition immediate vicinity scanning；By adjusting the second semiconductor laser
The voltage of device 11 makes flashlight frequency detuning ΔsWhen=0, there is peak value in (1), (2) and (3) curve in Fig. 4, peak in (1)
Value is maximum, illustrates backward coupled optical power Pc2When=0, at most, (3) are negative peak to the flashlight of transmission, illustrate Pc2=Pc1When, thoroughly
The flashlight penetrated is minimum.
Fig. 5 is on the basis of Fig. 4, to change backward coupled field power condition, the normalization reflection of four-wave mixing flashlight
Signal intensity is composed.In figure：(1) it is backward coupled optical power Pc2When=0, the normalization reflected signal strength of four-wave mixing flashlight
R is with flashlight frequency detuning ΔsChange curve；(2) it is backward coupled optical power Pc2=0.5Pc1When, four-wave mixing flashlight
Normalization reflected signal strength R with flashlight frequency detuning ΔsChange curve；(3) it is backward coupled optical power Pc2=Pc1
When, the normalization reflected signal strength R of four-wave mixing flashlight is with flashlight frequency detuning ΔsChange curve；Four-wave mixing
The reflection letter of the four-wave mixing flashlight that second photodetectors of normalization reflected signal strength R=Jing 17 of flashlight are detected
Number the one 45 ° of reflecting mirror 15 of intensity/Jing is reflected into the signal light intensity of Cs atom steam chest 9.As shown in Figure 5, when backward coupling
Luminous power Pc2When=0, incident flashlight is transmitted from Cs atom steam chest 9, is now produced without four-wave mixing reflected signal, former
Sub- medium system is transparent for the flashlight that frequency meets two-photon resonance；The second half-wave plate 7 is adjusted, makes to couple light backward
When power gradually increases, reflected signal is gradually produced on two-photon resonance immediate vicinity, the reflection direction of four-wave mixing signal
And gradually strengthen, work as Pc2=0.5Pc1When, atomic medium now relative to the signal near two-photon resonance, just as half
Saturating semi-reflective mirror；Work as Pc2=Pc1When, the intensity of four-wave mixing reflected signal reaches maximum, illustrates that now Cs atom medium is to double light
The reflectance of the flashlight at sub-resonance center reaches maximum, equivalent to total reflective mirror.
Can be seen that when signal light frequency and coupling light frequency meet two-photon resonance condition by Fig. 4 and Fig. 5, pass through
Adjust the second half-wave plate 7 to control to couple backward the watt level of light, thus it is possible to vary reflectance of the filter frequency reflecting mirror to flashlight
(absorbance), and work as Pc2=Pc1When, the reflectance of the filter frequency reflecting mirror is maximum.And the flashlight of other frequency contents is not produced
Any impact of life, it is achieved thereby that the continuously adjustable filter frequency reflection function of reflectance.
Embodiment 2
In the present embodiment a kind of structure filter frequency reflecting mirror method with it is identical in embodiment 1, wherein the one 45 ° is all-trans
Mirror 15 makes flashlight opposing coupler light direction with 0.14 ° of incident angles through thermokalite metallic atom steam chest 9, couples the work(of light
Rate be 30 milliwatts, the power P of flashlights=400 microwatts.
Using the above-mentioned equipment and identical in embodiment 1, wherein thermokalite metal applied and filter frequency mirror approach is built in example
The temperature of atom steam chest 9 is 30 degrees Celsius.
Embodiment 3
In the present embodiment a kind of structure filter frequency reflecting mirror method with it is identical in embodiment 1, wherein the one 45 ° is all-trans
Mirror 15 makes flashlight opposing coupler light direction with 0.6 ° of incident angles through thermokalite metallic atom steam chest 9, couples the work(of light
Rate be 5 milliwatts, the power P of flashlights=500 microwatts.
Using the above-mentioned equipment and identical in embodiment 1, wherein thermokalite metal applied and filter frequency mirror approach is built in example
The temperature of atom steam chest 9 is 70 degrees Celsius.
Filled with Cs atom steam in thermokalite metallic atom steam chest 9 in above-described embodiment, the Cs atom can also use rubidium, sodium
Replace Deng otheralkali metal.As long as the atom with multilevel system, and correspond to the relevant sharp of energy level transition with exciting
Radiant, forms Λ type three-level transition structures, can realize filtering frequency mirror function under the method for the invention.
Fig. 6 be Cs atom steam chest 9 length be 75mm, temperature be 30 DEG C, the forward direction coupling light of injection Cs atom steam chest 9
With backward coupled optical power 20 milliwatts, signal light power are for 300 microwatts, coupling light frequency off resonance ΔcUnder conditions of=0,
The present invention filters the changing trend diagram of the reflection efficiency with flashlight incident angle of frequency reflecting mirror.Filtering the reflection efficiency of frequency reflecting mirror is
Refer to when the reflectance of the filter frequency reflecting mirror is equal to 1, reflected signal strength and the incoming signal light intensity of four-wave mixing flashlight
Ratio, can be reflected by the normalization reflected signal peak value R of four-wave mixing flashlight.It will be appreciated from fig. 6 that changing entering for flashlight
Firing angle, the filter frequency reflecting mirror also changes therewith to the reflection efficiency of flashlight, when signal angle of light is 0.43 °, reflection effect
Rate is maximum.This is because the four-wave mixing process for producing the reflected signal follows the law of conservation of momentum, when flashlight and coupling light
Frequency effect when atomic energy level transition, reflection efficiency under the angle is maximum.When flashlight and coupling light action are in difference
Atomic energy level system or when selecting different atomic mediums, optimal incident angle is also different.
Fig. 7 be Cs atom steam chest 9 length be 75mm, the forward direction coupling light of injection Cs atom steam chest 9 and after to coupling
Luminous power is 20 milliwatts, signal light power for 300 microwatts and coupling light frequency off resonance ΔcUnder conditions of=0, present invention filter frequency
The reflection efficiency of reflecting mirror with Cs atom steam chest temperature change changing trend diagram；Reflection efficiency is by four-wave mixing flashlight
Normalization reflected signal peak value R is reflecting.In figure：(1) for 0.43 ° of flashlight incidence angle θ=when, filter the reflection effect of frequency reflecting mirror
Rate with the temperature change of thermokalite metallic atom steam chest variation tendency；(2) for 0.28 ° of flashlight incidence angle θ=when, filter frequency reflects
The reflection efficiency of mirror with the temperature change of thermokalite metallic atom steam chest 9 variation tendency；(3) it is 0.57 ° of flashlight incidence angle θ=
When, filter the variation tendency of the reflection efficiency with the temperature change of thermokalite metallic atom steam chest of frequency reflecting mirror.As shown in Figure 7, letter is worked as
Number angle of light θ=0.43 °, reflection efficiency is maximum, and when angle of incidence is more than or less than 0.43 °, reflection efficiency has declined；
As the reflection efficiency under the rising of temperature, incidence angles degree has been lifted, and the temperature in Cs atom steam chest 9 reaches 64
DEG C or so when, the reflection efficiency under incidence angles degree reaches maximum.It is 64 DEG C when the temperature of hot Cs atom steam chest 9 reaches,
During 0.43 ° of flashlight incidence angle θ=, reflection efficiency about 60%, when θ=0.28 °, reflection efficiency about 57%, θ=0.57 ° when,
Reflection efficiency about 45%, illustrates when the temperature of Cs atom steam chest 9 is higher, centered on 0.43 ° of angle of incidence, 0.2 ° of scope of just breaking a promise
It is interior, can obtain reflection spectrum signal of the reflection efficiency more than 40%.
Fig. 8 be Cs atom steam chest 9 length be 75mm, temperature be 35 DEG C, the forward direction coupling light of injection Cs atom steam chest 9
It is P with backward coupled optical powerc1=Pc2=20 milliwatts, the power of flashlight are Ps=300 microwatts, flashlight incidence angle θ=
Reflected signal spectrogram under conditions of 0.43 °, under difference coupling light frequency off resonance.In figure：(1) it is coupling light frequency off resonance Δc
During=8MHz, the normalization reflected signal strength R of four-wave mixing flashlight with flashlight frequency detuning change curve；(2) it is
Coupling light frequency off resonance ΔcDuring=41.4MHz, the normalization reflected signal strength R of four-wave mixing flashlight is with signal light frequency
The change curve of off resonance；(3) it is coupling light frequency off resonance ΔcDuring=82.3MHz, the normalization reflection letter of four-wave mixing flashlight
Number intensity R with flashlight frequency detuning change curve；(4) it is coupling light frequency off resonance ΔcDuring=123.3MHz, four-wave mixing
The normalization reflected signal strength R of signal with flashlight frequency detuning change curve；(5) it is coupling light frequency off resonance Δc=-
During 16.7MHz, the normalization reflected signal strength R of four-wave mixing flashlight with flashlight frequency detuning change curve；(6) it is
Coupling light frequency off resonance ΔcDuring=- 45.8MHz, the normalization reflected signal strength R of four-wave mixing flashlight is with signal light frequency
The change curve of off resonance；(7) it is coupling light frequency off resonance ΔcDuring=- 81MHz, the normalization reflection letter of four-wave mixing flashlight
Number intensity R with flashlight frequency detuning change curve；(8) it is coupling light frequency off resonance ΔcDuring=- 126.9MHz, four ripples are mixed
The normalization reflected signal strength R of frequency flashlight with flashlight frequency detuning change curve.As shown in Figure 8, four ripples of generation
The frequency location of mixing reflected signal peaks can be with the frequency detuning Δ of coupling lightcIt is mobile, but two-photon resonance bar is met all the time
Part, i.e. flashlight frequency detuning Δs=coupling light frequency mismatching angle Δc.Simultaneously when coupling light frequency off resonance ΔcWhen larger, produce
The peak efficiencies of raw reflected signal can be gradually lowered, but still may be used in the range of positive and negative 120MHz in coupling light frequency off resonance
With obtain reflection efficiency reach 40% reflected signal, illustrate the reflecting mirror can obtain broad spectrum reflection efficiency it is higher
Filter frequency reflected signal.Coupling light frequency off resonance ΔcCan be adjusted by adjusting the voltage of the first semiconductor laser 1, be passed through
Change the output of first laser device 1, the i.e. general power of standing wave coupling light to realize the company to filtering frequency reflecting mirror reflection efficiency
Continuous control.
Also filter frequency reflection can be adjusted to change the intensity of input signal light by adjusting the 3rd half-wave plate 13 in the present invention
The reflection efficiency of mirror.Realized to filter frequency by the output for changing first laser device 1, the i.e. general power of standing wave coupling light
The continuous control of reflecting mirror reflection efficiency, is 5-30 milliwatts in coupled optical power, and signal light power is the scope of 50-500 microwatts
It is interior, it is capable of achieving the present invention.
The present invention principle be：Four-wave mixing effect is the process that wave mixing signal is produced based on atomic coberent effect, is had
When body refers to that the standing wave coupled field of the last a pair acts on atomic medium, atomic medium is set to produce periodically the refractive index of flashlight
Modulation, while improve the third-order nonlinear susceptibility of medium, when signal light frequency is with coupling light and meeting two-photon resonance,
Atomic medium produces excited absorption to the flashlight of the frequency content, and produces four bundles light by stimulated radiation transition form,
That is four-wave mixing signal, preservation of energy determines that the new frequency for producing light is identical with absorbed incoming signal light, and frequency is not
This part signal light for meeting two-photon resonance condition then will not continue to propagate by excited absorption along the former direction of propagation, but can receive
To the resonance absorption and Doppler's absorption effect of hot atom random motion generation of Trapped ion；Meet the phase of the conservation of momentum
Position matching condition determines that four bundles light can be projected with incident illumination opposing coupler light direction symmetrical reverse, anti-so as to define filter frequency
Penetrate mirror effect.
Claims (9)
1. it is a kind of to build the method for filtering frequency reflecting mirror, it is characterised in that to comprise the steps：
1) the first polarization splitting prism (5) and are respectively provided with the light path entrance port of thermokalite metallic atom steam chest (9) both sides
Two polarization splitting prisms (8), the light path in the first polarization splitting prism (5) and the second polarization splitting prism (8) arbitrarily side enters
The incident angles that arranging the one 45 ° of total reflective mirror (15) at loophole enables flashlight opposing coupler light direction to be less than 0.6 ° are passed through
Thermokalite metallic atom steam chest (9)；
2) by two beam frequencies, polarization and the power identical coupling light difference polarization splitting prisms of Jing first (5), the second polarization spectro
To thermokalite metallic atom steam chest (9) is collinearly passed through, standing wave being formed in thermokalite metallic atom steam chest (9) after prism (8) reflection；
By another beam frequency continually varying flashlight Jing after the reflection of the one 45 ° of total reflective mirror (15) opposing coupler light direction with less than 0.6 °
Incident angles pass through thermokalite metallic atom steam chest (9)；Meet double light when flashlight is frequency scanned to the frequency of coupling light
During sub-resonance transition conditions, four-wave mixing effect is produced, while a branch of frequency identical four-wave mixing flashlight is reversely produced, should
The reflection direction of four-wave mixing flashlight and the angle of incidence of angle of reflection and flashlight relative to coupling light for coupling light direction formation
Size is identical, in opposite direction, and the flashlight of other incident frequency contents passes through thermokalite metallic atom steam chest along former incident direction
(9), so as to realize filter frequency mirror function.
2. the method that a kind of structure according to claim 1 filters frequency reflecting mirror, it is characterised in that：The thermokalite metallic atom
Filled with Cs atom steam in steam chest；The coupling light is the laser of wavelength 894.5nm and continuously-tuning, and its frequency effect is in caesium
Atom D1 line ground state Fg=4 to excited state Fe=4 energy level transition；The flashlight is wavelength 894.5nm and continuously-tuning
Laser, its frequency effect is in Cs atom D1 line ground state Fg=3 to excited state Fe=4 energy level transition and continuous scanning, in coupling
The transparent level structure of Λ type electromagnetically induceds is formed under the effect of light, flashlight and Cs atom.
3. the method that a kind of structure according to claim 1 filters frequency reflecting mirror, it is characterised in that：The flashlight relative to
The incidence angle θ of coupling light direction is 0.43 °.
4. the equipment that a kind of usage right requires the method that filter frequency reflecting mirror is built described in 1-3 any one, it is characterised in that：Bag
Include filter frequency mirror system, signal light system and detection system；
The filter frequency mirror system include the first semiconductor laser (1), the first optoisolator (2), beam splitter (3), first
Half-wave plate (4), the 2nd 45 ° of total reflective mirror (6), the second half-wave plate (7) and by the first polarization splitting prism (5), the second polarization spectro
The filter frequency reflecting mirror that prism (8), thermokalite metallic atom steam chest (9) and the one 45 ° of total reflective mirror (15) are constituted, the first semiconductor laser
Device (1) is sequentially provided with the first optoisolator (2) and divides to couple radiant on the emitting light path of the first semiconductor laser (1)
Beam device (3), in the light path of beam splitter (3) transmission the first half-wave plate (4) and the first polarization splitting prism (5), beam splitting are sequentially provided with
The light path of device (3) reflection is provided with the 2nd 45 ° of total reflective mirror (6), and the is sequentially provided with the reflected light path of the 2nd 45 ° of total reflective mirror (6)
Two half-wave plates (7) and the second polarization splitting prism (8), the first polarization splitting prism (5) and the second polarization splitting prism (8) it is anti-
Penetrate light path and be provided with thermokalite metallic atom steam chest (9), first is arranged at the light path entrance port of the first polarization splitting prism (5)
45 ° of total reflective mirrors (15) enable flashlight opposing coupler light direction and pass through thermokalite metallic atom vapour with the incident angles less than 0.6 °
Room (9)；
The signal light system include the second semiconductor laser (11), the second optoisolator (12), the 3rd half-wave plate (13) and
The semiconductor laser (11) of 3rd polarization splitting prism (14) second is signal radiant, and the second semiconductor laser (11) go out
Penetrate in light path and be sequentially provided with the second optoisolator (12), the 3rd half-wave plate (13) and the 3rd polarization splitting prism (14)；
The detection system includes the first photodetector (16), the second photodetector (17) and digital storage oscilloscope
(20), the first photodetector (16) is located at Jing the 1st°Total reflective mirror (15) reflects and sequentially passes through thermokalite metallic atom steam chest
(9) and in the light path of the second polarization splitting prism (8), the second photodetector (17) is located at and passes back through the first polarization spectro rib
In the light path of the four-wave mixing signaling reflex light of mirror (5), the letter of the first photodetector (16) and the second photodetector (17)
Number outfan is connected with digital storage oscilloscope (20) jointly.
5. equipment according to claim 4, it is characterised in that：Also include temperature control instrument (10), the temperature control instrument (10) is located at
The periphery of thermokalite metallic atom steam chest (9) is used to controlling and showing the temperature of thermokalite metallic atom steam chest (9), thermokalite metallic atom
The temperature of steam chest (9) is 30-70 degree Celsius.
6. equipment according to claim 5, it is characterised in that：The temperature of the thermokalite metallic atom steam chest (9) is taken the photograph for 64
Family name's degree.
7. equipment according to claim 4, it is characterised in that：The two ends end face plating of the thermokalite metallic atom steam chest (9)
There is the anti-reflection film that relative wavelength is 894.5nm, the μ paper tinsels that have three layers are wrapped up in the side of thermokalite metallic atom steam chest (9).
8. equipment according to claim 4, it is characterised in that：First photodetector (16) and the second photodetector
(17) respectively the BNC wires (18) of Jing the first and the 2nd BNC wires (19) are connected to digital storage oscilloscope (20), for showing spy
Signal and data storage are surveyed, the trigger of digital storage oscilloscope (20) is provided by the second semiconductor laser (11).
9. equipment according to claim 4, it is characterised in that：The reflectance of the filter frequency reflecting mirror can be by adjusting second
Half-wave plate (7) is adjusting.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110940418A (en) * | 2019-12-23 | 2020-03-31 | 中国科学技术大学 | Method and device for regulating and controlling electromagnetic induction transparency in cesium atom two-photon absorption spectrum |
| CN113325614A (en) * | 2021-05-14 | 2021-08-31 | 山西大学 | Narrow-band filtering device and method based on filtering medium |
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| CN104882783A (en) * | 2015-04-16 | 2015-09-02 | 山西大学 | Method of realizing bidirectional optical diode and device of realizing bidirectional optical diode |
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| CN105375250A (en) * | 2015-12-02 | 2016-03-02 | 山西大学 | Method and device for generation of higher-order transverse modes on the basis of atom-cavity coupling |
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| JPH03161083A (en) * | 1989-11-17 | 1991-07-11 | Aisin Seiki Co Ltd | Driving mechanism for piezoelectric vibrator and water drop removing device using same driving mechanism |
| WO2012101391A1 (en) * | 2011-01-24 | 2012-08-02 | University Of Southampton | Optical fiber lasers |
| CN104882783A (en) * | 2015-04-16 | 2015-09-02 | 山西大学 | Method of realizing bidirectional optical diode and device of realizing bidirectional optical diode |
| CN105356293A (en) * | 2015-10-30 | 2016-02-24 | 北京航天控制仪器研究所 | Acousto-optic modulation system of semiconductor laser saturated-absorption frequency stabilization device |
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| CN110940418A (en) * | 2019-12-23 | 2020-03-31 | 中国科学技术大学 | Method and device for regulating and controlling electromagnetic induction transparency in cesium atom two-photon absorption spectrum |
| CN110940418B (en) * | 2019-12-23 | 2024-02-09 | 中国科学技术大学 | Method and device for regulating and controlling electromagnetic induction transparency in cesium atom two-photon absorption spectrum |
| CN113325614A (en) * | 2021-05-14 | 2021-08-31 | 山西大学 | Narrow-band filtering device and method based on filtering medium |
| CN113325614B (en) * | 2021-05-14 | 2023-03-24 | 山西大学 | Narrow-band filtering device and method based on filtering medium |
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