CN203595881U - Precise quantum wavelength tuning unit - Google Patents
Precise quantum wavelength tuning unit Download PDFInfo
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- CN203595881U CN203595881U CN201320781505.7U CN201320781505U CN203595881U CN 203595881 U CN203595881 U CN 203595881U CN 201320781505 U CN201320781505 U CN 201320781505U CN 203595881 U CN203595881 U CN 203595881U
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Abstract
The utility model relates to the field of optics wavelength converting and tuning, in particular to a precise quantum wavelength tuning unit which is suitable for a visible wave band and a near-infrared band. The precise quantum wavelength tuning unit is characterized in that one end of the tuning unit is an input end, the other end of the tuning unit is an output end, a light path between the input end and the output end is at least connected with a first coincidence frequency converting device and a second coincidence frequency converting device. The output end of the first coincidence frequency device and the input end of the second coincidence frequency device are connected. The precise quantum wavelength tuning unit has the advantages that signal light wavelength tuning precision is high, and the original quantum feature of signal light can be kept. The shortcoming that signal light wavelength fine tuning of a single coincidence upper converting or coincidence lower converting cannot be achieved is overcome, the shortcoming that four-wave-mixing-based quantum wavelength tuning efficiency is not high is overcome, in contrast, through the method, converting efficiency is higher, and the dynamitic adjusting range is larger.
Description
Technical field
The utility model relates to optical wavelength conversion and tuning field, is specifically related to a kind of accurate quantum wavelength tuner that is applicable to visible waveband and near-infrared band.
Background technology
Along with the develop rapidly of quantum information science technology, it is very urgent that the demand of quantum network becomes.Because photon is difficult for loss and is difficult for the characteristic of eliminating coherence, make it in quantum information transmission, bring into play irreplaceable effect.But in quantum network, the general alkali atom that adopts of quantum storage, its applicable photon wavelength is very harsh, and general single-photon light source can not be in this wavelength.In order to obtain optimum coupling wavelength, just need urgently the device that can realize photon state quantum wavelength tuning.This continuously adjustable quantum frequency conversion device need to meet following three aspects: 1, can realize the frequency translation of arbitrary size being found in near-infrared band, thereby meet the operation wavelength of different quantum device optimums in quantum communications.2, the photon after frequency displacement can keep all Quantum Properties of original state, comprises Entanglement, photon number statistical distribution, time correlation etc.3, must can realize high conversion efficiency, and in transfer process, can not introduce any extra noise photon.
At present, the second order nonlinear effect utilizing with frequently or difference frequency process, only meet two conditions below, it can only be realized photon state and separate distant frequency from a frequency translation to another, in general be all that visible light wave range is transformed into near-infrared band, otherwise or, can not realize wavelength conversion and wavelength tuning in visible light wave range or near-infrared band.Four-wave mixing process based on third-order non-linear effect, although can meet in theory three above aspects, because the nonlinear effect of high-order needs very strong pumping light intensity, is experimentally difficult to realize higher conversion efficiency.
Summary of the invention
The purpose of this utility model is according to above-mentioned the deficiencies in the prior art, a kind of quantum wavelength tuner of precision is provided, the second order nonlinear effect that this device utilizes with frequently or difference frequency process, realize the fine setting of signal light wavelength in visible and near-infrared band, and keep its original Quantum Properties.
The utility model object realizes and being completed by following technical scheme:
A kind of quantum wavelength tuner of precision, in order to the accurate quantum wavelength of tuning visible waveband and near-infrared band, it is characterized in that: described tuner one end is input end, the other end is output terminal, described input end is at least connected with first, second coincidence frequency conversion equipment to the light path between described output terminal, and the output terminal of the described first relevant frequency conversion apparatus is connected with the input end of the described second relevant frequency conversion apparatus.
The described first relevant frequency conversion apparatus is conversion equipment in coincidence frequency, and the described second relevant frequency conversion apparatus is conversion equipment under coincidence frequency.
The described first relevant frequency conversion apparatus is conversion equipment under coincidence frequency, and the described second relevant frequency conversion apparatus is conversion equipment in coincidence frequency.
Described coincidence frequency conversion equipment is made up of to mirror, pump light, second order nonlinear crystal, wave filter double-colored, wherein said bidirectional color mirror is by the flashlight of described input end and described pumping combiner, this closes Shu Guang produces and frequency light or difference frequency light its beam waist position via a lens focus in described second order nonlinear crystal center, then is connected to described wave filter through lens.
Described input end is optical fiber input, described coincidence frequency conversion equipment is made up of wavelength division multiplexer, pump light, second order nonlinear crystal, wave filter, wherein said wavelength division multiplexer is by the flashlight of described input end and described pumping combiner, this closes Shu Guang produces and frequency light or difference frequency light its beam waist position via a lens focus in described second order nonlinear crystal center, then is connected to described wave filter through lens.
The utility model has the advantages that: signal light wavelength tuning precision is high, can the original Quantum Properties of holding signal light.Overcome the defect that can not realize signal light wavelength fine setting of single relevant upper conversion or relevant lower transfer process, also overcome based on the not high shortcoming of four-wave mixing quantum wavelength tuning efficiency, Comparatively speaking, this method conversion efficiency is higher, and dynamic adjustments scope is larger.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram of the present utility model;
Fig. 2 is the utility model principle schematic.
Embodiment
The utility model feature and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
As shown in Figure 1-2, in figure, mark 1-16 is respectively: input end 1, double-colored to mirror 2, pump light 3, lens 4, second order nonlinear crystal 5, lens 6, wave filter 7, double-colored to mirror 8, pump light 9, lens 10, second order nonlinear crystal 11, lens 12, wave filter 13, output terminal 14, coincidence frequency conversion equipment 15, coincidence frequency conversion equipment 16.
Embodiment: as shown in Figure 1, quantum wavelength tuner one end in the present embodiment is input end 1, the other end is output terminal 14, in light path between input end 1 and output terminal 14, be provided with coincidence frequency conversion equipment 15 and coincidence frequency conversion equipment 16, the input end of coincidence frequency conversion equipment 15 is connected with input end 1, output terminal is connected with the input end of coincidence frequency conversion equipment 16, and the output terminal of coincidence frequency conversion equipment 16 is connected with output terminal 14; When the quantum light wave in visible light wave range or near-infrared band via input end 1 successively through coincidence frequency conversion equipment 15,16 to output terminal 14, keeping in original Quantum Properties, realizing the wavelength tuning in visible light wave range or near-infrared band.
Coincidence frequency conversion equipment 15 is identical with the structure composition of coincidence frequency conversion equipment 16, but in the present embodiment, coincidence frequency conversion equipment 15 carries out in frequency changing in order to the first input light to input end 1 for conversion equipment in coincidence frequency, and coincidence frequency conversion equipment 16 carries out changing under frequency in order to the output light to coincidence frequency conversion equipment 15 for lower conversion equipment.
Coincidence frequency conversion equipment 15 comprises double-colored to mirror 2, pump light 3, lens 4, second order nonlinear crystal 5, lens 6, wave filter 7.Double-coloredly to mirror 2, the quantum light wave of being inputted by input end 1 and pump light 3 are closed to bundle, the input light of input end 1 and pump light 3 need the space coupling of light beam, even if the hot spot of pump light 3 is more bigger than the hot spot of input light, pump light 3 both can cover whole flashlight hot spot like this, can obtain again high as far as possible light intensity, thereby improve conversion efficiency.The Shu Guang that closes of input light and pump light 3 focuses on second order nonlinear crystal 5 via lens 4, and the focal length of lens 4 is selected to weigh the high three-dimensional parameter of second order nonlinear crystal 5 length and width, closes Shu Guang and in second order nonlinear crystal 5, passes through to produce and frequency light with effect frequently.Wherein, depend on mode (angle automatching, Temperature Matching or the accurate phase matching) difference of nonlinear crystal phase matching, may need angles to crystal, working temperature, polarization cycle etc. select accordingly and control.Become directional light with frequency light scioptics 6 collimations, wherein the focus in object space of lens 6 is in the center of second order nonlinear crystal 5.In order to remove pump light and other parasitic lights, and light is again by wave filter 7 after scioptics 6 frequently, and wave filter 7 can coordinate many middle filtering modes, as dispersion light splitting (prism or grating), spatial filter, spectrum filter etc.
Coincidence frequency conversion equipment 16 comprises double-colored to mirror 8, pump light 9, lens 10, second order nonlinear crystal 11, lens 12, wave filter 13.Double-coloredly will close bundle with frequency light and pump light 9 by wave filter 7 is that export to mirror 2.This closes Shu Guang and focuses on second order nonlinear crystal 11 via lens 10, utilizes nonlinear difference process to produce difference frequency light, and wherein, lower transfer process also needs the coupling of flashlight and pump light 9 space hot spots.Then, difference frequency light scioptics 12, are collimated into directional light.Then by the wave filter 13 of corresponding wave band, remove the noise photon of its all band, finally export to output terminal 14.By the centre wavelength of tuning pump light 3 or pump light 9, just can obtain the fine tune of input center wavelength of light.
The present embodiment is in the specific implementation: as shown in Figure 2, coincidence frequency conversion equipment 15 adopts switch technology in coincidence frequency, first the signal of input carried out changing in frequency.Be under the effect of pump light 3 of ω p1 in centre frequency, what flashlight was concerned with from frequencies omega 1 is transformed into ω 2, meets law of conservation of energy: ω 1+ ω P1=ω 2 in transfer process.Relevant upper switch technology, has kept all coherence messages and the Quantum Properties of input light.
Coincidence frequency conversion equipment 16 adopts switch technology under coincidence frequency, and the frequency that coincidence frequency conversion equipment 15 is produced is that the light of ω 2 carries out conversion operations under frequency.Be under the effect of pump light 9 of ω p2 in centre frequency, input light from frequencies omega 2 relevant be transformed into ω 3, in transfer process, meet law of conservation of energy: ω 2-ω P2=ω 3.Relevant lower switch technology, has kept all coherence messages and the Quantum Properties of input light.In lower transfer process, because the frequencies omega P2 of pump light 9 is less than input light frequency ω 2, therefore photon energy is relatively also little, thereby suppresses the noise photon of changing under the Spontaneous Parametric of heavy pumping field, and final acquisition under approximate muting coincidence frequency changed.
Frequency is ω 1 initial input signal, and more than process, after two coincidence frequency transfer processes, final incoming frequency is ω 3.And, utilize law of conservation of energy to find out, Δ=ω 3-ω 1=ω P1-ω P2.So just can carry out by controlling the frequency interval of two pump lights the size of conditioning signal optical frequency shift.By the wavelength of in accurate tuning pump light 3 or pump light 9, just can realize the accurate quantum wavelength tuning of input optical signal.For the ground unrest that the heavy pumping field reducing in relevant upper conversion or lower transfer process causes, can adopt the scheme of long wavelength's pumping.
In general, utilize the rear lower cascade transfer process of changing of first upper conversion to be suitable for input wavelength into infrared band.Certainly, the also cascade transfer process of upper conversion after first lower conversion, so the size of flashlight frequency displacement is Δ=ω 3-ω 1=ω P2-ω P1.Adopting the cascade coincidence frequency transfer process of this order to be suitable for input wavelength is visible waveband.
The input of optical fiber that input end 1 adopts, double-coloredly also can be substituted with wavelength division multiplexer (WDM) to mirror.
The maximum feature of this tuner and advantage are that signal light wavelength tuning precision is high, can the original Quantum Properties of holding signal light.Overcome the defect that can not realize signal light wavelength fine setting of single relevant upper conversion or relevant lower transfer process, also overcome based on the not high shortcoming of four-wave mixing quantum wavelength tuning efficiency, Comparatively speaking, this tuner transition efficiency is higher, regulates dynamic range larger.
Claims (5)
1. an accurate quantum wavelength tuner, in order to the accurate quantum wavelength of tuning visible waveband and near-infrared band, it is characterized in that: described tuner one end is input end, the other end is output terminal, described input end is at least connected with first, second coincidence frequency conversion equipment to the light path between described output terminal, and the output terminal of the described first relevant frequency conversion apparatus is connected with the input end of the described second relevant frequency conversion apparatus.
2. the quantum wavelength tuner of a kind of precision according to claim 1, is characterized in that: the described first relevant frequency conversion apparatus is conversion equipment in coincidence frequency, and the described second relevant frequency conversion apparatus is conversion equipment under coincidence frequency.
3. the quantum wavelength tuner of a kind of precision according to claim 1, is characterized in that: the described first relevant frequency conversion apparatus is conversion equipment under coincidence frequency, and the described second relevant frequency conversion apparatus is conversion equipment in coincidence frequency.
4. according to the quantum wavelength tuner of a kind of precision described in claim 1,2 or 3, it is characterized in that: described coincidence frequency conversion equipment is made up of to mirror, pump light, second order nonlinear crystal, wave filter double-colored, wherein said bidirectional color mirror is by the flashlight of described input end and described pumping combiner, this closes Shu Guang produces and frequency light or difference frequency light its beam waist position via a lens focus in described second order nonlinear crystal center, then is connected to described wave filter through lens.
5. according to the quantum wavelength tuner of a kind of precision described in claim 1,2 or 3, it is characterized in that: described input end is optical fiber input, described coincidence frequency conversion equipment is made up of wavelength division multiplexer, pump light, second order nonlinear crystal, wave filter, wherein said wavelength division multiplexer is by the flashlight of described input end and described pumping combiner, this closes Shu Guang produces and frequency light or difference frequency light its beam waist position via a lens focus in described second order nonlinear crystal center, then is connected to described wave filter through lens.
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| CN201320781505.7U CN203595881U (en) | 2013-12-03 | 2013-12-03 | Precise quantum wavelength tuning unit |
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| CN201320781505.7U CN203595881U (en) | 2013-12-03 | 2013-12-03 | Precise quantum wavelength tuning unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285488A (en) * | 2021-12-09 | 2022-04-05 | 中国电子科技集团公司第五十四研究所 | Wavelength conversion interface device and method for light quantum communication and storage |
| CN115683365A (en) * | 2022-12-28 | 2023-02-03 | 安徽鲲腾量子科技有限公司 | Tunable quantum beat frequency interference device based on quantum frequency up-conversion |
-
2013
- 2013-12-03 CN CN201320781505.7U patent/CN203595881U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285488A (en) * | 2021-12-09 | 2022-04-05 | 中国电子科技集团公司第五十四研究所 | Wavelength conversion interface device and method for light quantum communication and storage |
| CN115683365A (en) * | 2022-12-28 | 2023-02-03 | 安徽鲲腾量子科技有限公司 | Tunable quantum beat frequency interference device based on quantum frequency up-conversion |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 Termination date: 20151203 |
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| EXPY | Termination of patent right or utility model |