CN210005837U - Dual-color marking photon source generation module and dual-compatible communication device comprising same - Google Patents
Dual-color marking photon source generation module and dual-compatible communication device comprising same Download PDFInfo
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- CN210005837U CN210005837U CN201920773239.0U CN201920773239U CN210005837U CN 210005837 U CN210005837 U CN 210005837U CN 201920773239 U CN201920773239 U CN 201920773239U CN 210005837 U CN210005837 U CN 210005837U
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Abstract
The utility model relates to a laser technology, nonlinear optics physics technique, quantum optics and quantum communication technical field especially relate to double-colored mark photon source and produce module and including the two compatible communication device of this module, wherein double-colored mark photon source produces the module and includes the inclined to one side that is used for adjusting input pulse light that sets gradually on the light pathThe optical sheet component comprises a vibrating and focusing optical sheet component and a third quasi-phase matching crystal PPKTP3, wherein third pump light with set wavelength is input at the input end of the optical sheet component, the third pump light is converted into pairs of signal photons and idler frequency photons through the spontaneous yield of the third quasi-phase matching crystal PPKTP3, and the wavelength and the bandwidth of the signal photons and the idler frequency photons conform to an energy conservation and momentum conservation formula and are converted into omegap＝ωs+ωi(1)Δk＝kp‑ks‑ki+2 pi/Λ ═ 0 (2). The utility model discloses well double-colored mark photon source that accords with formula (1) and formula (2) produces the module and can produce two way pulse photon signals simultaneously to the wavelength can be compatible underwater communication window and fiber communication window simultaneously.
Description
Technical Field
The utility model relates to a laser technology, nonlinear optics physics technique, quantum optics and quantum communication technical field especially relate to double-colored mark photon source produces module and reaches two compatible communication device including this module.
Background
At present, the channels for communication mainly comprise optical fibers, free space and underwater channels, and the optical wavelength required to be coded is in a low-loss window of the channel in order to increase the communication distance. The low-loss window of the optical fiber channel is positioned in a 1.5-micrometer wave band, and the low-loss window of the underwater communication channel is positioned in a blue-green laser wave band (the range is 450 nm-530 nm).
In the field of quantum communication, marking a dual-photon source is an important resource for researching quantum communication technology. Future quantum communication systems need to be compatible with different communication channels, so that preparing photon sources in different types of communication channel window bands is an important basis for realizing mixed quantum networks. The existing bicolor photon source is mainly used for connecting a quantum memory and a low-loss optical fiber communication window, but no report about the bicolor photon source compatible with an underwater communication window and an optical fiber communication window at the same time exists. The development of the bicolor photon pair can provide convenience for the construction of future optical fibers and underwater hybrid quantum communication networks.
In view of this, there is a need to develop high-quality bicolor photon sources compatible with both underwater and fiber channel, which will help to construct a hybrid quantum network, and facilitates the photon source to also play an advantage in a bicolor ghost imaging system.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies of the prior art, the utility model provides a two-color marking photon source produces module and includes two compatible communication device of this module for this reason.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the double-color marking photon source generation module comprises an optical sheet component, a third quasi-phase matching crystal PPKTP3, wherein the optical sheet component and the third quasi-phase matching crystal PPKTP3 are sequentially arranged on an optical path and used for adjusting the polarization state and the focus of input pulsed light, the input end of the optical sheet component inputs third pump light with set wavelength, the third pump light is converted into pairs of signal photons and idler photons under the spontaneous yield of the third quasi-phase matching crystal PPKTP3, and the wavelength and the bandwidth of the signal photons and the idler photons accord with an energy conservation and momentum conservation formula and are converted into:
ωp＝ωs+ωi(1)
Δk＝kp-ks-ki+2π/Λ＝0 (2)
wherein k isq＝2πnq/λq(q＝p,s,i)，kp、ks、kiWave vectors of the third pump light, the signal photon and the idler photon respectively, and Λ is the polarization period of the third quasi-phase matching crystal PPKTP3, omegap、ωs、ωiThe vibration frequencies, n, of the third pump light, the signal photon and the idler photon in the quasi-phase matching crystalp、ns、niRefractive indices, λ, of the third pump, signal and idler photons, respectively, in the quasi-phase-matched crystalp、λs、λiThe wavelengths of the third pump light, the signal photon and the idler photon are respectively, and the bandwidths of the signal photon and the idler photon can be obtained according to the vibration frequency.
Optimally, the third quasi-phase matching crystal PPKTP3 is a quasi-phase matching second-class phase matching crystal.
Optimally, two end faces of the third quasi-phase matching crystal PPKTP3 are plated with antireflection films with three wavelengths corresponding to the third pump light, the signal photons and the idler photons.
Preferably, the optical sheet assembly comprises a polarization adjusting unit and a focusing unit which are arranged on the optical path.
Preferably, the module further comprises a temperature control furnace, and the third quasi-phase matching crystal PPKTP3 is arranged in the temperature control furnace.
The dual-compatible communication device comprises the dual-color marking photon source generation module and further comprises a photon receiving module, wherein the photon receiving module comprises a second dichroic mirror DM2, a channel communication component and a second channel communication component, the second dichroic mirror DM2 transmits signal photons and idler frequency photons into a optical branch and a second optical branch and correspondingly transmits the signal photons and the idler frequency photons into the channel communication component and the second optical branch respectively, the channel communication component comprises a long pass filter LPF and a second collimation component which are arranged on the optical branch and used for filtering third pump light, and the second channel communication component comprises a band pass filter BPF and a third collimation component which are arranged on the second optical branch and used for filtering the third pump light.
Preferably, the photon receiving module further comprises a coincidence counting unit, the coincidence counting unit comprises a single-photon detector SPD1, a second single-photon detector SP2 and a coincidence counter, the single-photon detector SPD1 and the second single-photon detector SP2 are correspondingly arranged at the output ends of the optical branch and the second optical branch, and the output ends of the single-photon detector SPD1 and the second single-photon detector SP2 are respectively connected with the coincidence counter.
Preferably, the device further comprises a frequency doubling module, the frequency doubling module comprises an th pump light source Laser, a transmission dimming unit, a th frequency doubling unit, a th dichroic mirror DM1 and a second frequency doubling unit, which are sequentially arranged along the light path, and the th frequency doubling unit and the second frequency doubling unit both comprise a lens and a periodically polarized crystal, which play a role in focusing.
Preferably, the frequency doubling units and the periodic polarization crystals in the second frequency doubling units are type phase-matched periodic polarization crystals.
Preferably, the th pump light source Laser outputs 1560nm pump light, the th frequency doubling unit outputs 780nm frequency doubling light, the second frequency doubling unit outputs 390nm quadruple frequency light, the quadruple frequency light is used as third pump light and is transmitted into a third quasi-phase matching crystal PPKTP3 after passing through a th collimation transmission component and an optical sheet component in sequence, and the th collimation transmission component comprises a violet single-mode fiber SMF and a second collimation unit and a third collimation unit which are respectively arranged at two ends of the violet single-mode fiber SMF.
The utility model has the advantages that:
(1) the utility model discloses well double-colored mark photon source that accords with formula (1) and formula (2) produces the module and can produce two way pulse photon signals simultaneously to the wavelength can be compatible underwater communication window and fiber communication window simultaneously.
(2) The utility model provides a tuningout unit is arranged in adjusting the polarization state that gets into the pump light of the accurate phase matching crystal PPKTP3 of third, and the focus unit is arranged in focusing the pump light to the accurate phase matching crystal PPKTP3 of third.
(3) The utility model discloses be provided with the temperature control stove, adjust the polarization cycle of third accurate phase matching crystal PPKTP3 through the temperature regulation.
(4) The utility model provides a two compatible communication device application double-colored mark photon source produces the module and specifically realizes compatible underwater communication and optical fiber communication, wherein the sweetgum fruit that way communication components formed communicates the light path and is located the blue-green laser window of the low loss of underwater communication, and the second communication light path that second way communication components formed is located the optical fiber communication wave band window of low loss.
(5) The coincidence counting unit is used for representing the quality of the light source generated by the double-color marking photon source generating module.
(6) Wherein pump light source Laser is optic fibre picosecond Laser, the utility model discloses a frequency doubling module can obtain the ultraviolet Laser who is used for pump parameter down-conversion, third pump light promptly because optic fibre pulse Laser has small, characteristics such as power height, through the frequency doubling process in two type quasi-phase matching crystals, can be with the Laser direct conversion of the optic fibre picosecond Laser that the optical wavelength is 1560nm for the third pump light that the wavelength is 390nm, the advantage of utilizing ultrafast Laser is that its peak power is high, the nonlinear conversion efficiency that the single passes through is high, thereby can avoid complicated exocoel frequency doubling process, make entire system's structure simpler and compact.
(7) The utility model discloses well frequency multiplication unit and the interior periodic polarization crystal of second frequency multiplication unit and the accurate phase matching crystal PPKTP3 of third all use accurate phase matching crystal, and accurate phase matching crystal has nonlinear conversion efficiency height for the angle matching crystal, does not have the space to walk away from the effect.
(8) Purple light single mode fiber SMF has two aspects effects, the aspect can effectual filtering 1560nm pump light and 780 nm's frequency doubling light, avoids complicated composite filter, and single mode fiber has fine mode filtering effect in addition, can guarantee that the facula of outgoing is close to ideal gaussian beam.
(9) The utility model provides a compatible underwater and the two-color mark light source of hi-lite of optic fibre low-loss channel simultaneously, its utensil dual wavelength output, luminance is high, has very big potentiality in the aspect of constructing remote mixed quantum communication network and two-color ghost imaging.
(10) The utility model discloses a conversion process preparation double-colored mark photon is right under the parameter of sending out based on in the third accurate phase matching crystal PPKTP3, its pump light utilizes high repetition frequency, the optic fibre picosecond laser of high power produces quadruple frequency pump laser in the periodic polarization crystal of type phase matching, the quadruple frequency pump laser of production is collected through single mode fiber SMF for the purple light, thereby can efficient filtering pump light and double frequency laser, can carry out the spatial mode filtering to ultraviolet pump light simultaneously, thereby can be efficient pump parameter down the conversion crystal, produce the double-colored photon of hi-lite right double-colored photon, double-colored photon is in blue-green laser wave band to photons, be used for low-loss underwater light-passing window, wavelength is located optical fiber communication window, double-colored photon will establish the basis for constructing mixed quantum communication network, meanwhile, this kind of high-luminance photon source can also be used for double-colored ghost imaging experiment research, the detection advantage and the infrared light field of utilizing visible light detector are at the transmission advantage of spatial channel, therefore this double-colored photon mixed quantum communication network and ghost imaging research have important meaning to double-colored research.
Drawings
Fig. 1 is a schematic diagram of an optical path structure of high-brightness bicolor marker light sources compatible with underwater and optical fiber low-loss channels simultaneously according to an embodiment of the present invention.
Fig. 2 is a graph of the single-pass count of the two-color photon pairs generated in the present invention as a function of pump power.
Fig. 3 is a graph of the ratio of coincidence count to dark coincidence CAR of photons with pump power in the present invention.
Fig. 4 is a graph of the signal-to-noise ratio of two-photon coincidence with the pumping power according to an embodiment of the present invention.
Detailed Description
Example 1
As shown in FIG. 1, the dual-color flag photon source generating module comprises an optical sheet assembly and a third quasi-phase matching crystal PPKTP3, which are sequentially arranged on an optical path and used for adjusting the polarization state and focusing of input pulsed light, wherein the input end of the optical sheet assembly inputs third pump light with a set wavelength, the optical sheet assembly comprises a polarization adjusting unit and a focusing unit, the polarization adjusting unit comprises a half-wave plate HWP2 and a quarter-wave plate QWP, which are sequentially arranged on the optical path, the focusing unit is a third collimating lens L4, the half-wave plate HWP2 and the quarter-wave plate QWP are used for adjusting the third pump light to a proper polarization state, and a lens L4 is used for focusing and transmitting the third pump light after polarization adjustment to the third quasi-phase matching crystal PPKTP 3.
The third pump light is down-converted into pairs of signal photons and idler photons by the spontaneous yield of a third quasi-phase matching crystal PPKTP3, the wavelengths and bandwidths of the signal photons and the idler photons conform to the energy conservation and momentum conservation formulas, and the third pump light is converted into:
ωp＝ωs+ωi(1)
Δk＝kp-ks-ki+2π/Λ＝0 (2)
wherein k isq＝2πnq/λq(q＝p,s,i)，kp、ks、kiWave vectors of the third pump light, the signal photon and the idler photon respectively, and Λ is the polarization period of the third quasi-phase matching crystal PPKTP3, omegap、ωs、ωiThe vibration frequencies, n, of the third pump light, the signal photon and the idler photon in the quasi-phase matching crystalp、ns、niRefractive indices, λ, of the third pump, signal and idler photons, respectively, in the quasi-phase-matched crystalp、λs、λiThe wavelengths of the third pump light, the signal photon and the idler photon are respectively, and the bandwidths of the signal photon and the idler photon can be obtained according to the vibration frequency, wherein the wavelength of the signal photon is of 1560nm and 520nm, and the wavelength of the idler photon is another of 1560nm and 520 nm.
And two end faces of the third quasi-phase matching crystal PPKTP3 are plated with antireflection films with three wavelengths corresponding to third pump light, signal photons and idler photons. Namely, the antireflection films with 390nm, 520nm and 1560nm wavelength are coated.
The module further comprises a temperature control furnace, and the third quasi-phase matching crystal PPKTP3 is arranged in the temperature control furnace. Thereby adjusting the polarization period of the third quasi-phase matching crystal PPKTP3 in equation (2). In this embodiment, the temperature control range is 15 to 70 degrees centigrade, and the temperature control precision is 2mK.
Example 2
As shown in fig. 1, the dual-compatible communication device including the dual-color labeled photon source generation module according to embodiment 1 further includes a frequency doubling module disposed at a front end of the dual-color labeled photon source generation module, and a photon receiving module disposed behind the dual-color labeled photon source generation module.
The frequency doubling module comprises an pumping light source Laser, a transmission dimming unit, a frequency doubling unit, a dichroic mirror DM1 and a second frequency doubling unit which are sequentially arranged along an optical path, wherein the frequency doubling unit and the second frequency doubling unit respectively comprise a lens and a periodic polarized crystal which play a focusing role, the periodic polarized crystal in the frequency doubling unit and the second frequency doubling unit is an type phase-matched periodic polarized crystal, the type matching has the advantages that the maximum nonlinear coefficient of the crystal can be utilized, the conversion efficiency is high, and the pumping light source Laser is a pulse Laser with the center wavelength of 1560nm, the pulse width of 1ps, the repetition frequency of 80MHz and the average power of 1W.
The transmission dimming unit comprises a polarization maintaining fiber PMF, a fiber collimator FC1, a half-wave plate HWP1 and a polarization beam splitter PBS, wherein the polarization maintaining fiber PMF is used for transmitting pump light with the wavelength of 1560nm output by an th pump light source Laser, the polarization maintaining fiber PMF is used for maintaining the output polarization state of the fiber Laser, and the output pump light is collimated by a collimator FC1 and then sequentially passes through the half-wave plate HWP1 and the polarization beam splitter PBS to adjust the light intensity of the pump light with the wavelength of 1560 nm.
The th frequency doubling unit comprises a lens L1 and a th quasi-phase matching crystal PPKTP1, pump light penetrating through the polarizing beam splitter PBS is focused into a th quasi-phase matching crystal PPKTP1 through the 1560nm lens L1, antireflection films of 1560nm and 780nm are plated on two end faces of the th quasi-phase matching crystal PPKTP1 along the optical path direction, and the th frequency doubling unit is used for outputting 780nm frequency doubled light.
The dichroic mirror DM1 is used for reflecting pump light with the wavelength of 780nm into the second frequency doubling unit.
The second frequency doubling unit comprises a lens L2, a second quasi-phase matching crystal PPKTP2, 780nm pump light is focused into the second quasi-phase matching crystal PPKTP2 through a 780nm lens L2, the quasi-phase matching crystal PPKTP1 and the second quasi-phase matching crystal PPKTP2 are both provided with temperature control furnaces, the temperature control range is 15-70 ℃, the temperature control precision is 2mK., 390nm and 780nm antireflection films are plated on two end faces of the second quasi-phase matching crystal PPKTP2 along the optical path direction, and the second frequency doubling unit outputs 390nm quadruple frequency light.
The four-octave light sequentially passes through the th collimation transmission component and the light sheet component and then is transmitted into the third quasi-phase matching crystal PPKTP3, the th collimation transmission component comprises a purple light single-mode fiber SMF, and a second collimation unit and a third collimation unit which are arranged on two sides of the purple light single-mode fiber SMF, the second collimation unit comprises a collimation lens L3 and a second fiber collimator FC2 which are sequentially arranged, and the third collimation unit is a third fiber collimator FC 3.
The quarter-frequency 390nm laser is coupled into a single-mode fiber SMF through a second collimation unit and then is emitted through a third fiber collimator FC3, the polarization of the emitted laser is adjusted to a proper polarization state through a half-wave plate HWP2 and a quarter-wave wave plate QWP, and then is focused into a parameter down-conversion crystal PPKTP3 through a lens L4 to generate a two-color photon pair.
The photon receiving module comprises a second dichroic mirror DM2, a path communication component and a second path communication component, wherein the second dichroic mirror DM2 transmits signal photons and idler frequency photons to a optical branch and a second optical branch, and correspondingly transmits the signal photons and the idler frequency photons to the path communication component and the second path communication component respectively, the path communication component comprises a long pass filter LPF and a second collimation component which are arranged on a optical branch and used for filtering third pump light, the second collimation component comprises a collimating lens L5 and a fourth fiber collimator FC4, the second path communication component comprises a band pass filter BPF and a third collimation component which are arranged on the second optical branch and used for filtering the third pump light, and the third collimation component comprises a collimating lens L6 and a fifth fiber collimator FC 5.
Example 3
In order to characterize the quality of the light source generated by the two-color labeled photon source generation module, as shown in fig. 1, in addition to the structure in embodiment 2, the photon receiving module further includes a coincidence counting unit, which includes a th single-photon detector SPD1, a second single-photon detector SP2 and a coincidence counter, wherein the th single-photon detector SPD1 and the second single-photon detector SP2 are correspondingly disposed at the output ends of the th optical branch and the second optical branch, the th single-photon detector SPD1 and the second single-photon detector SP2 are respectively connected with the coincidence counter, and photons with wavelengths of 520nm and 1560nm are respectively collected into single-mode fibers through a fourth optical fiber collimator FC4 and a fifth optical fiber FC5 on the th optical branch and the second optical branch, and are detected and coincidently measured by the visible single-photon detector SPD1 and the infrared single-photon detector SPD 2.
In the present embodiment, the following parameters of the photon source need to be measured in order to characterize the quality of the generated bi-color marker light source, first, the wavelength needs to be measured as the relationship between the generation rate of the signal photons and the idler photons and the pump power, as shown in fig. 2 and 3, the single-path count rate of the photons in the present embodiment can reach 110kHz/mW, the coincidence count rate can reach 13.1 kHz/mW., and then the relationship between the ratio of the coincidence count of the photons and the dark coincidence CAR with the power needs to be characterized, as shown in fig. 4, in the present embodiment, the ratio of the coincidence count of the photons and the dark coincidence CAR can reach 161 at 0.86mW pump, the marker efficiency of the photon source under needs to be calculated for the marker light source,
in the formula, NccIndicating coincidence of the count value, N, at the set powersFor one-way counting of signal photons at a set power, NiTo set the one-way count of idler photons at power, the labeling efficiency can reach a higher level by optimizing the collection parameters.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. Double-colored mark photon source produces module, its characterized in that includes the optical sheet subassembly, the third accurate phase matching crystal PPKTP3 that are used for adjusting the polarization state and the focus of input pulse light that set gradually on the light path, the third pump light of wavelength is set for in the optical sheet subassembly input, and the spontaneous output down conversion that the third pump light passes through the third accurate phase matching crystal PPKTP3 becomes to signal photon and idle frequency photon, the wavelength and the bandwidth of signal photon and idle frequency photon accord with energy conservation and momentum conservation formula, convert into:
ωp＝ωs+ωi(1)
Δk＝kp-ks-ki+2π/Λ＝0 (2)
wherein k isq＝2πnq/λq(q＝p,s,i)，kp、ks、kiWave vectors of the third pump light, the signal photon and the idler photon respectively, and Λ is the polarization period of the third quasi-phase matching crystal PPKTP3, omegap、ωs、ωiThe vibration frequencies, n, of the third pump light, the signal photon and the idler photon in the quasi-phase matching crystalp、ns、niRefractive indices, λ, of the third pump, signal and idler photons, respectively, in the quasi-phase-matched crystalp、λs、λiThe wavelengths of the third pump light, the signal photon and the idler photon are respectively, and the bandwidths of the signal photon and the idler photon can be obtained according to the vibration frequency.
2. A bi-color tagged photon source generating module as claimed in claim 1 wherein said third quasi-phase matched crystal PPKTP3 is a quasi-phase matched two-class phase matched crystal.
3. The generation module of a bi-color marker photon source of claim 1, wherein two end faces of the third quasi-phase matching crystal PPKTP3 are coated with antireflection films for three wavelengths corresponding to the third pump light, the signal photons and the idler photons.
4. A bi-color marker photon source generating module as claimed in claim 1 wherein said light sheet assembly comprises a polarization adjusting unit and a focusing unit disposed on the light path.
5. A bi-color tagged photon source generation module as claimed in claim 1, wherein the module further comprises a temperature controlled oven, said third quasi-phase matched crystal PPKTP3 being disposed within the temperature controlled oven.
6. The dual compatible communication device comprising the dual color photon source generating module of any of claims 1-5, further comprising a photon receiving module, wherein the photon receiving module comprises a second dichroic mirror DM2, a th communication module and a second communication module, the second dichroic mirror DM2 emits signal photons and idler photons into a th optical branch and the second optical branch for transmission to a th communication module and the second communication module, respectively, the th communication module comprises a Long Pass Filter (LPF) disposed on a th optical branch for filtering out the third pump light and a second collimating module, and the second communication module comprises a Band Pass Filter (BPF) disposed on the second optical branch for filtering out the third pump light and a third collimating module.
7. The dual-compatibility communication device according to claim 6, wherein the photon receiving module further comprises a coincidence counting unit, the coincidence counting unit comprises single-photon detector SPD1, a second single-photon detector SP2 and a coincidence counter, a single-photon detector SPD1 and a second single-photon detector SP2 are correspondingly arranged at the output ends of the optical branch and the second optical branch, and the output ends of the single-photon detector SPD1 and the second single-photon detector SP2 are respectively connected with the coincidence counter.
8. The apparatus according to claim 6, further comprising a frequency doubling module, wherein the frequency doubling module comprises pump light source, transmission dimming unit, frequency doubling unit, dichroic mirror DM1, and second frequency doubling unit, which are sequentially arranged along the optical path, and each of the frequency doubling unit and the second frequency doubling unit comprises a lens for focusing and a periodically poled crystal.
9. The apparatus according to claim 8, wherein the frequency doubling units and the periodically poled crystals in the second frequency doubling unit are type phase matched periodically poled crystals.
10. The apparatus according to claim 8, wherein the th pump light source Laser outputs 1560nm pump light, the th frequency doubling unit outputs 780nm double-frequency light, the second frequency doubling unit outputs 390nm quadruple-frequency light, the quadruple-frequency light passes through the th collimating transmission module and the optical sheet module as the third pump light and is transmitted to the third quasi-phase-matching crystal PPKTP3, and the th collimating transmission module includes a violet single-mode fiber SMF, and a second collimating unit and a third collimating unit respectively disposed at two ends of the violet single-mode fiber SMF.
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Effective date of registration: 20210517 Address after: 266109 16 / F, block B, building 1, No.151 huizhiqiao Road, high tech Zone, Qingdao City, Shandong Province Patentee after: QINGDAO QUANTUM APPLICATION TECHNOLOGY Co.,Ltd. Patentee after: Hefei Hengyuan Quantum Technology Co.,Ltd. Address before: 266109 16 / F, block B, building 1, No.151 huizhiqiao Road, high tech Zone, Qingdao City, Shandong Province Patentee before: QINGDAO QUANTUM APPLICATION TECHNOLOGY Co.,Ltd. |