CN111442837A - Near-infrared up-conversion single photon detector - Google Patents
Near-infrared up-conversion single photon detector Download PDFInfo
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- CN111442837A CN111442837A CN202010267265.3A CN202010267265A CN111442837A CN 111442837 A CN111442837 A CN 111442837A CN 202010267265 A CN202010267265 A CN 202010267265A CN 111442837 A CN111442837 A CN 111442837A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 28
- 238000005086 pumping Methods 0.000 claims abstract description 29
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 20
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011777 magnesium Substances 0.000 claims abstract description 18
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 9
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 3
- 230000010287 polarization Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 16
- 229910052779 Neodymium Inorganic materials 0.000 claims description 9
- 229910052691 Erbium Inorganic materials 0.000 claims description 8
- 229910052775 Thulium Inorganic materials 0.000 claims description 7
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 6
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 6
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052702 rhenium Inorganic materials 0.000 abstract description 4
- 239000013307 optical fiber Substances 0.000 description 10
- 238000001914 filtration Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- PEFIIJCLFMFTEP-UHFFFAOYSA-N [Nd].[Mg] Chemical compound [Nd].[Mg] PEFIIJCLFMFTEP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- OZCSIGAAICFSHZ-UHFFFAOYSA-N erbium magnesium Chemical compound [Mg].[Er] OZCSIGAAICFSHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- MREGQANYZQLVDP-UHFFFAOYSA-N magnesium thulium Chemical compound [Mg].[Tm] MREGQANYZQLVDP-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4413—Type
- G01J2001/442—Single-photon detection or photon counting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4446—Type of detector
- G01J2001/446—Photodiode
- G01J2001/4466—Avalanche
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The application discloses a near-infrared up-conversion single photon detector, which comprises a pumping light source and a waveguide, wherein the waveguide is a periodically polarized rare earth doped lithium niobate waveguide Re, PP L N or a periodically polarized rare earth and magnesium co-doped lithium niobate waveguide Re, Mg, PP L N, the pumping light source is a semiconductor L D laser, L D lasers emitting lasers with different wavelengths are adopted according to different rare earth elements, so that the laser wavelength emitted by the L D laser is matched with the pumping wavelength required by the rare earth elements, rare earth doping in the waveguide realizes that the pumping light source directly utilizes a L D laser, and photons of signal light are converted into photons of visible light through self-pumping sum frequency.
Description
Technical Field
The application relates to the technical field of quantum information, in particular to a near-infrared up-conversion single photon detector.
Background
In quantum information science, laser in a near infrared (1 μm) band has an important application prospect in various fields such as quantum communication, quantum radar, space communication, medical application, single photon cameras and the like. For example, a single photon camera is an ultra-low noise and ultra-high sensitivity photodetector, can detect light intensity of a single photon or several photon levels, and converts the light intensity into a clear image which can be recognized by human eyes or an image sensor through photoelectric conversion, high-performance amplification and the like. The single-photon camera can realize out-of-view imaging and has important application value in the fields of unmanned driving, extreme condition rescue, military reconnaissance, geological exploration and the like. The high-performance practical near-infrared single-photon detector is the premise of applying quantum information science.
The current international universal near-infrared band single photon detectors mainly comprise three types, namely a superconducting single photon detector, an indium gallium arsenic avalanche diode single photon detector and an up-conversion single photon detector, wherein the superconducting single photon detector needs to work at the temperature of liquid helium, the volume of equipment is large, the cost is high, the use scene of the superconducting single photon detector is greatly limited, the indium gallium arsenic avalanche diode single photon detector does not need a refrigerant and can be integrated, however, due to the imperfection of a material process, the dark count and the back pulse are high, the quantum efficiency is low and is only about 10 percent, the up-conversion single photon detector utilizes the high-efficiency sum frequency process of the nonlinear optics of periodically polarized lithium niobate (PP L N) to up-convert the near-infrared band photons into visible photons, meanwhile, the quantum characteristics are kept unchanged, and then the silicon avalanche diode detector is used for detection, and a long-wave pumping technology is adopted, so that the problem of introducing high noise in the nonlinear process of the PP L N waveguide is solved, the noise caused by the spontaneous conversion under the parameter can be eliminated, and the noise caused by the Raman scattering is greatly reduced.
The 1550nm or 1950nm optical fiber laser is generated by a L D laser pump erbium-doped or thulium-doped laser crystal respectively, and is added with an auxiliary optical circuit accessory, compared with a millimeter-scale PP L N waveguide with a millimeter-scale length and a millimeter-scale thickness, the size of the auxiliary optical circuit accessory is only centimeter-scale length and millimeter-scale thickness, so that the realization of a miniaturized single photon detector is a necessary premise for realizing portable quantum information equipment.
Disclosure of Invention
In order to solve the technical problems, the following technical scheme is provided:
in a first aspect, an embodiment of the present application provides a near-infrared up-conversion single photon detector, including a pump light source and a waveguide, where the waveguide is a periodically-polarized rare-earth-doped lithium niobate waveguide Re: PP L N or a periodically-polarized rare-earth-magnesium-codoped lithium niobate waveguide Re: Mg: PP L N, the pump light source is a semiconductor L D laser, and L D lasers emitting lasers with different wavelengths are adopted according to differences of rare earth elements, so that a laser wavelength emitted by the L D laser matches with a pump wavelength required by the rare earth elements.
By adopting the implementation mode, the rare earth is doped in the waveguide, so that the L D laser is directly utilized as a pumping light source, and the photons of the signal light are converted into the photons of the visible light through self-pumping sum frequency.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the rare earth element includes: neodymium element, erbium element, and thulium element.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, corresponding neodymium elements, erbium elements, and thulium elements are doped into the periodically-polarized lithium niobate waveguide, and the laser wavelengths emitted by the L D laser are 813nm, 980nm, and 800nm, respectively.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the wavelength of the fundamental frequency light of the waveguide is greater than the wavelength of the signal light.
With reference to the first aspect or any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, a polarization maintaining wavelength division multiplexer is disposed between the pump light source and the waveguide, and the polarization maintaining wavelength division multiplexer receives the pump light and the signal light emitted by the pump light source through polarization maintaining fibers, and combines and outputs the pump light and the signal light to the waveguide.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the pump light excites fundamental frequency light of the waveguide, and the fundamental frequency light and the signal light perform frequency-sum conversion to convert photons of the signal light into photons of visible light.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the apparatus further includes a single photon counting module, where the single photon counting module is configured to count the photons.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, a filtering module is disposed between the single photon counting module and the waveguide, and the filtering module is configured to eliminate stray light in a self-pumping and frequency nonlinear process.
With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the single photon counting module includes: a silicon avalanche diode detector.
With reference to the first aspect, in a ninth possible implementation manner of the first aspect, the apparatus further includes a temperature control module, where the temperature control module is configured to adjust a temperature of the waveguide.
Drawings
Fig. 1 is a schematic structural diagram of a near-infrared up-conversion single-photon detector provided in an embodiment of the present application.
Detailed Description
The present invention will be described with reference to the accompanying drawings and embodiments.
Fig. 1 is a diagram of a near-infrared up-conversion single-photon detector provided in an embodiment of the present application, and referring to fig. 1, the near-infrared up-conversion single-photon detector provided in the embodiment of the present application includes: the device comprises a pumping light source, a polarization maintaining wavelength division multiplexer, a waveguide, a filtering module and a single photon counting module.
The waveguide in the embodiment is a periodically polarized rare earth doped lithium niobate waveguide Re: PP L N or a periodically polarized rare earth and magnesium co-doped lithium niobate waveguide Re: Mg: PP L N, the pumping light source is a semiconductor L D laser, the rare earth elements comprise neodymium, erbium and thulium, and L D lasers emitting laser with different wavelengths are adopted according to the difference of the rare earth elements, so that the laser wavelength emitted by the L D laser is matched with the pumping wavelength required by the rare earth elements.
Specifically, corresponding neodymium element, erbium element and thulium element are doped into the periodically poled lithium niobate waveguide, and the laser wavelengths emitted by the L D laser are 813nm, 980nm and 800nm respectively.
The polarization maintaining wavelength division multiplexer can respectively receive the pump light pump and the signal light emitted by the pump light source through the polarization maintaining optical fiber, and the combined beams of the pump light and the signal light are output to the waveguides of Re PP L N or Re PP L N.Re PP L N or Re PP L N through the polarization maintaining optical fiber.
The pump light excites the fundamental frequency light Re: PP L N or Re: Mg: PP L N, then the fundamental frequency light and the signal light are subjected to frequency conversion, the photons of the signal light are converted into the photons of visible light, and the wavelength of the fundamental frequency light of the waveguide is larger than that of the signal light.
In order to meet the quasi-phase matching condition of the nonlinear conversion process in the waveguide and achieve the maximum conversion efficiency, a temperature control module can be further arranged and used for adjusting the temperature of the waveguide. Before the single photon counting module is used for measuring sum frequency light, a narrow-band filtering module is arranged to eliminate stray light in the self-pumping and sum frequency nonlinear process. The single photon counting module includes a silicon avalanche diode detector to provide high single photon detection efficiency, and ultra low noise.
In an illustrative embodiment, the waveguide in the embodiment is a neodymium-doped lithium niobate waveguide Nd: PP L N or neodymium-magnesium co-doped lithium niobate waveguide Nd: Mg: PP L N, L D laser, the laser wavelength emitted by the laser is 813nm, the laser wavelength is the central absorption wavelength of Nd: PP L N or Nd: Mg: PP L N, and the pump laser output by the pump light source enters the polarization-maintaining wavelength division multiplexer through the polarization-maintaining optical fiber.
The wavelength of single photon signal light of a near infrared band to be measured is 1064nm, the single photon signal light enters the polarization maintaining wavelength division multiplexer through the polarization maintaining optical fiber, and is combined with pump light into a beam which is output from the wavelength division multiplexer, and the combined beam light output from the wavelength division multiplexer enters an Nd: PP L N or Nd: Mg: PP L N waveguide through the polarization maintaining optical fiber.
The Nd: PP L N or Nd: Mg: PP L N waveguide is used as a nonlinear medium of self-pumping sum frequency, fundamental frequency light 1084nm is excited under the pumping of pump light 813nm, then the fundamental frequency light and 1064nm signal light generate sum frequency based on the quasi-phase matching principle, and 537nm photons are output.
The output 537nm photons are subjected to narrow-band filtering module to eliminate stray light in self-pumping and frequency nonlinear process, and then enter a single photon counting module to count the photons.
In another exemplary embodiment, the waveguide in this embodiment is an erbium-doped lithium niobate waveguide Er: PP L N or erbium-magnesium co-doped lithium niobate waveguide Er: Mg: PP L N, L D laser, which emits a laser wavelength of 980nm and a central absorption wavelength of Er: PP L N or Er: Mg: PP L N, and the pump laser output by the pump light source enters the polarization maintaining wavelength division multiplexer through the polarization maintaining fiber.
The wavelength of single photon signal light of a near infrared band to be detected is 1064nm, the single photon signal light enters the polarization maintaining wavelength division multiplexer through the polarization maintaining optical fiber, and is combined with pump light into a beam which is output from the wavelength division multiplexer, and the combined beam light output from the polarization maintaining wavelength division multiplexer enters Er: PP L N or Er: Mg: PP L N through the polarization maintaining optical fiber.
The Er: PP L N or the Er: Mg: PP L N is used as a nonlinear medium of self-pumping sum frequency, fundamental frequency light 1550nm is excited under pumping of pump light 980nm, then the sum frequency is generated by the fundamental frequency light and 1064nm signal light based on a quasi-phase matching principle, and 631nm photons are output.
Stray light in the self-pumping and frequency nonlinear process of the output 631nm photons is eliminated through a narrow-band filtering module, and then the photons enter a single photon counting module to be counted.
In another exemplary embodiment, the waveguide in this embodiment is a thulium-doped lithium niobate waveguide Tm: PP L N or a thulium-magnesium co-doped lithium niobate waveguide Tm: Mg: PP L N, L D laser, the laser wavelength is 800nm, the laser wavelength is the central absorption wavelength of Tm: PP L N or Tm: Mg: PP L N, and the pump laser output by the pump light source enters the wavelength division multiplexer through the polarization maintaining fiber.
The wavelength of the single photon signal light of the near infrared band to be measured is 1550nm, the single photon signal light enters the polarization maintaining wavelength division multiplexer through the polarization maintaining optical fiber, and is combined with the pump light into a beam which is output from the polarization maintaining wavelength division multiplexer, and the combined beam output from the polarization maintaining wavelength division multiplexer enters the Tm: PP L N or the Tm: Mg: PP L N through the polarization maintaining optical fiber.
And the Tm is PP L N or the Tm is Mg PP L N which is used as a nonlinear medium of self-pumping sum frequency, excites fundamental frequency light 1950nm under the pumping of pumping light 800nm, then generates sum frequency based on the fundamental frequency light and 1550nm signal light of a quasi-phase matching principle, and outputs 863nm photons.
The output 863nm photons are subjected to narrow-band filtering module to eliminate stray light in the self-pumping and frequency nonlinear process, and then enter a single photon counting module to count the photons.
According to the embodiments, the near-infrared up-conversion single photon detector is provided, rare earth is doped in a waveguide, a pumping light source is directly utilized by an L D laser, and photons of signal light are converted into photons of visible light through self-pumping sum frequency.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Of course, the above description is not limited to the above examples, and technical features that are not described in this application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present application and not for limiting the present application, and the present application is only described in detail with reference to the preferred embodiments instead, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present application may be made by those skilled in the art without departing from the spirit of the present application, and the scope of the claims of the present application should also be covered.
Claims (10)
1. A near-infrared up-conversion single photon detector comprises a pumping light source and a waveguide, and is characterized in that the waveguide is a periodically polarized rare earth doped lithium niobate waveguide Re: PP L N or a periodically polarized rare earth and magnesium co-doped lithium niobate waveguide Re: Mg: PP L N, the pumping light source is a semiconductor L D laser, and L D lasers emitting lasers with different wavelengths are adopted according to different rare earth elements, so that the laser wavelength emitted by the L D laser is matched with the pumping wavelength required by the rare earth elements.
2. The near-infrared up-conversion single photon detector of claim 1 in which the rare earth elements comprise: neodymium element, erbium element, and thulium element.
3. The near-infrared up-conversion single photon detector of claim 2, wherein corresponding neodymium element, erbium element and thulium element are doped into said periodically poled lithium niobate waveguide, and the laser wavelengths emitted from said L D laser are 813nm, 980nm and 800nm, respectively.
4. The near-infrared up-conversion single photon detector of claim 1 in which the wavelength of fundamental light of said waveguide is longer than the wavelength of signal light.
5. The near-infrared up-conversion single photon detector according to any one of claims 1-4, wherein a polarization maintaining wavelength division multiplexer is disposed between the pump light source and the waveguide, and the polarization maintaining wavelength division multiplexer receives the pump light and the signal light emitted from the pump light source through a polarization maintaining fiber respectively and outputs the combined pump light and signal light to the waveguide.
6. The near-infrared up-conversion single photon detector of claim 5, wherein said pump light excites fundamental frequency light of said waveguide, said fundamental frequency light and said signal light undergo sum frequency conversion to convert photons of signal light into photons of visible light.
7. The near-infrared up-conversion single photon detector of claim 6 further comprising a single photon counting module for counting the photons.
8. The near-infrared up-conversion single photon detector of claim 7, wherein a filter module is disposed between said single photon counting module and said waveguide, said filter module being configured to eliminate stray light in self-pumping and frequency non-linear processes.
9. The near-infrared up-conversion single photon detector of claim 7 in which said single photon counting module comprises: a silicon avalanche diode detector.
10. The near-infrared up-conversion single photon detector of claim 1 further comprising a temperature control module for adjusting the temperature of said waveguide.
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| CN202010267265.3A CN111442837A (en) | 2020-04-08 | 2020-04-08 | Near-infrared up-conversion single photon detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358218A (en) * | 2021-05-18 | 2021-09-07 | 西安交通大学 | Lithium niobate waveguide infrared two-photon coincidence measurement device and method based on periodic polarization |
| CN114362829A (en) * | 2021-12-21 | 2022-04-15 | 济南量子技术研究院 | PPLN-based polarization-independent frequency conversion method, device and single photon detector |
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| US20060274401A1 (en) * | 2003-04-22 | 2006-12-07 | Shuichiro Inoue | Single-photon generator |
| CN108507689A (en) * | 2017-02-28 | 2018-09-07 | 山东量子科学技术研究院有限公司 | Upper conversion single-photon detector for 1 mu m waveband |
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2020
- 2020-04-08 CN CN202010267265.3A patent/CN111442837A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060274401A1 (en) * | 2003-04-22 | 2006-12-07 | Shuichiro Inoue | Single-photon generator |
| CN108507689A (en) * | 2017-02-28 | 2018-09-07 | 山东量子科学技术研究院有限公司 | Upper conversion single-photon detector for 1 mu m waveband |
Non-Patent Citations (1)
| Title |
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| HEYAN LIU 等: "1514 nm eye-safe passively Q-switched self-optical parametric oscillator based on Nd3+ doped MgO:PPLN", 《CHINESE OPTICS LETTERS》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358218A (en) * | 2021-05-18 | 2021-09-07 | 西安交通大学 | Lithium niobate waveguide infrared two-photon coincidence measurement device and method based on periodic polarization |
| CN113358218B (en) * | 2021-05-18 | 2023-03-28 | 西安交通大学 | Lithium niobate waveguide infrared two-photon coincidence measurement device and method based on periodic polarization |
| CN114362829A (en) * | 2021-12-21 | 2022-04-15 | 济南量子技术研究院 | PPLN-based polarization-independent frequency conversion method, device and single photon detector |
| CN114362829B (en) * | 2021-12-21 | 2024-05-03 | 济南量子技术研究院 | PPLN-based polarization independent frequency conversion method, device and single photon detector |
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