CN102243107A - High-sensitivity up-conversion single photon detection system - Google Patents
High-sensitivity up-conversion single photon detection system Download PDFInfo
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- CN102243107A CN102243107A CN2011100989551A CN201110098955A CN102243107A CN 102243107 A CN102243107 A CN 102243107A CN 2011100989551 A CN2011100989551 A CN 2011100989551A CN 201110098955 A CN201110098955 A CN 201110098955A CN 102243107 A CN102243107 A CN 102243107A
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Abstract
The invention relates to a high-sensitivity up-conversion single photon detection system. The system comprises an adjustable attenuator for receiving pumping laser emitted by a laser device; an output end of the adjustable attenuator is connected with an input end of a beam splitter; the output end of the beam splitter is respectively connected with a power meter and a wavelength-division multiplexer which is used for receiving signal light to be coupled; the output end of the wavelength-division multiplexer is connected with the input end of a nonlinear waveguide; and a single photon detector is arranged at the output end of the nonlinear waveguide. In the invention, the pumping laser enters into the nonlinear waveguide with the signal light by wavelength-division multiplexing, and the nonlinear waveguide can eliminate Raman noise to a great extent. In the nonlinear waveguide, the signal light can be converted up into visible light, and the up converted visible photons are collected in the single photo detector for detection.
Description
Technical field
The present invention relates to a kind of single-photon detecting examining system, conversion single-photon detecting examining system on especially a kind of high sensitivity.
Background technology
Single-photon detector is the main tool of carrying out superweak photodetection, has a wide range of applications in various fields.The core devices in fields such as the quantum communications especially of the single-photon detector of communication band, quantum cryptography, optical fiber time-domain reflectomer, communication band single-photon detector commonly used have three kinds of superconductor detector, indium gallium arsenic avalanche diode single-photon detector and last conversion detectors.
Superconductor detector has the low advantage of noise, yet that its needs is bulky, complex operation and expensive ultralow temperature cooling system, is difficult to use in actual applications, and in addition, the detection efficiency of commercial superconductor detector is on the low side, has also limited its application.Commercial indium gallium arsenic avalanche diode single-photon detector has that volume is little, cost is low, can be integrated etc. advantage, yet it has detection efficiency shortcoming on the low side equally, simultaneously, its significant afterpulse effect has also been brought strong noise, makes its application have a greatly reduced quality.Last conversion detector utilizes nonlinear waveguide that the communication band light frequency is changed, on be converted into visible light, and use the avalanche silicon diode single-photon detector to survey, it has the detection efficiency height, advantages such as working and room temperature, its shortcoming is the Raman too noisy that produces at non-linear frequency transfer process medium and low frequency pumping laser, and this has seriously limited the performance of detector and application system.
Summary of the invention
The object of the present invention is to provide conversion single-photon detecting examining system on a kind of high sensitivity that can strict suppress to go up conversion detector Raman scattering influence.
For achieving the above object, the present invention has adopted following technical scheme: conversion single-photon detecting examining system on a kind of high sensitivity, comprise the adjustable attenuator that is used to receive pumping laser that laser instrument is launched, the output terminal of adjustable attenuator links to each other with the input end of beam splitter, the output terminal of beam splitter respectively with power meter, be used to receive the wavelength division multiplexer for the treatment of coupled signal light and link to each other, the output terminal of wavelength division multiplexer links to each other with the input end of nonlinear waveguide, and single-photon detector is positioned at the output terminal of nonlinear waveguide.
As shown from the above technical solution, the pumping laser among the present invention enters nonlinear waveguide by wavelength-division multiplex with flashlight, and nonlinear waveguide can be eliminated the Raman noise to a great extent.In nonlinear waveguide, flashlight can on be converted into visible light, the light photon of last conversion will be collected into single-photon detector, survey.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Conversion single-photon detecting examining system on a kind of high sensitivity, comprise the adjustable attenuator 3 that is used to receive pumping laser that laser instrument is launched, the output terminal of adjustable attenuator 3 links to each other with the input end of beam splitter 4, the output terminal of beam splitter 4 respectively with power meter 1, be used to receive the wavelength division multiplexer 5 for the treatment of coupled signal light and link to each other, the output terminal of wavelength division multiplexer 5 links to each other with the input end of nonlinear waveguide, single-photon detector is positioned at the output terminal of nonlinear waveguide, as shown in Figure 1.Adjustable attenuator 3 is regulated and is input to the power of nonlinear waveguide, thereby can regulate the detection efficiency and the noise of conversion detector.
As shown in Figure 1, described laser instrument is for mixing thulium or mixing the holmium fiber laser, and the wavelength of mixing thulium or mixing the pumping laser that the holmium fiber laser launched is 1.9 μ m～2.1 μ m, and described single-photon detector is an avalanche silicon diode single-photon detector 11.Described nonlinear waveguide is periodically poled lithium niobate waveguide 2, the output terminal of adjustable attenuator 3 links to each other by the input end of optical fiber with beam splitter 4, the output terminal of beam splitter 4 links to each other with power meter 1, wavelength division multiplexer 5 respectively by optical fiber, and the output terminal of wavelength division multiplexer 5 links to each other by the fibre-optical splice of optical fiber with periodically poled lithium niobate waveguide 2.The manufacturing process of periodically poled lithium niobate waveguide 2 is, at first on the lithium niobate sample, use photoengraving delimiting period sequence, form period polarized then by high voltage, method with photoengraving defines the waveguide model again, then it is immersed niobic acid, lithium ion in the waveguide is replaced with the proton in the niobic acid, the sample refractive index of replacing is higher than the sample that does not have displacement, form periodically poled lithium niobate waveguide 2, only can propagate TM pattern light wave in the periodically poled lithium niobate ripple 2, above conversion detector is a polarization sensitive type detector.Described beam splitter 4 is the 99:1 beam splitter, its output power of 99% is connected to wavelength division multiplexer 5, enter periodically poled lithium niobate waveguide 2 at last as pump light, its output power of 1% is connected to power meter 1, thereby monitoring enters the pump power of periodically poled lithium niobate waveguide 2.
As shown in Figure 1, the output terminal of described periodically poled lithium niobate waveguide 2 sets gradually first microcobjective 6, filter, second microcobjective 10 and avalanche silicon diode single-photon detector 11, avalanche silicon diode single-photon detector 11 is placed on three-dimensional the adjustment on the platform, at three dimension adjusted avalanche silicon diode single-photon detectors 11, thereby obtain maximum detection efficiency.Described periodically poled lithium niobate waveguide 2 is placed in the semiconductor temperature-control device, be pasted with thermopair and refrigeration module on the semiconductor temperature-control device, the output terminal of thermopair links to each other with the input end of controller, the output terminal of controller links to each other with the refrigeration module, thermopair is used for detected temperatures, and detected temperature signal is sent to controller, and output control signals to the refrigeration module by controller, regulate the high/low of temperature.The temperature of periodically poled lithium niobate waveguide 2 is by the control of semiconductor temperature-control device, and the temperature-controlled precision of semiconductor temperature-control device can reach+/-0.2 degree.Under fixed temperature, the length of the spectral bandwidth of last conversion detector and periodically poled lithium niobate waveguide 2 is inversely proportional to, and along with the temperature variation of periodically poled lithium niobate waveguide 2, spectral centroid will be moved.
As shown in Figure 1, described filter is made up of low pass filters 7, high permeability coherent filtering sheet 8 and diaphragm 9, and low pass filters 7, high permeability coherent filtering sheet 8, diaphragm 9 are placed between first microcobjective 6 and second microcobjective 10 successively.Described periodically poled lithium niobate waveguide 2, first microcobjective 6, low pass filters 7, high permeability coherent filtering sheet 8, diaphragm 9, second microcobjective 10 and avalanche silicon diode single-photon detector 11 are positioned on the same central horizontal axis.First microcobjective 6 is used for the light that periodically poled lithium niobate waveguide 2 is sent is collimated, low pass filters 7 is used to eliminate the noise that the pump light the second harmonic brings, high permeability coherent filtering sheet 8 is used to eliminate the Raman noise that pump light brings, diaphragm 9 is used to remove parasitic light, and second microcobjective 10 is used for last convert light is collected avalanche silicon diode single-photon detector 11.
Pumping laser among the present invention enters periodically poled lithium niobate waveguide 2 by wavelength-division multiplex with flashlight, and periodically poled lithium niobate waveguide 2 can be eliminated the Raman noise to a great extent.In periodically poled lithium niobate waveguide 2, flashlight can on be converted into visible light, the light photon of last conversion will be collected into avalanche silicon diode single-photon detector 11 and survey.In addition, high permeability coherent filtering sheet 8 also can further be eliminated the Raman noise that pump light brings.
Claims (6)
1. change the single-photon detecting examining system on a high sensitivity, it is characterized in that: comprise the adjustable attenuator (3) that is used to receive pumping laser that laser instrument is launched, the output terminal of adjustable attenuator (3) links to each other with the input end of beam splitter (4), the output terminal of beam splitter (4) respectively with power meter (1), be used to receive the wavelength division multiplexer (5) for the treatment of coupled signal light and link to each other, the output terminal of wavelength division multiplexer (5) links to each other with the input end of nonlinear waveguide, and single-photon detector is positioned at the output terminal of nonlinear waveguide.
2. conversion single-photon detecting examining system on the high sensitivity according to claim 1, it is characterized in that: described laser instrument is for mixing thulium or mixing the holmium fiber laser, the wavelength of mixing thulium or mixing the pumping laser that the holmium fiber laser launched is 1.9 μ m～2.1 μ m, described single-photon detector is avalanche silicon diode single-photon detector (11), described beam splitter (4) is the 99:1 beam splitter, described nonlinear waveguide is periodically poled lithium niobate waveguide (2), the output terminal of adjustable attenuator (3) links to each other by the input end of optical fiber with beam splitter (4), the output terminal of beam splitter (4) by optical fiber respectively with power meter (1), wavelength division multiplexer (5) links to each other, and the output terminal of wavelength division multiplexer (5) links to each other by the fibre-optical splice of optical fiber with periodically poled lithium niobate waveguide (2).
3. conversion single-photon detecting examining system on the high sensitivity according to claim 2, it is characterized in that: the output terminal of described periodically poled lithium niobate waveguide (2) sets gradually first microcobjective (6), filter, second microcobjective (10) and avalanche silicon diode single-photon detector (11), and avalanche silicon diode single-photon detector (11) is placed on three-dimensional the adjustment on the platform.
4. conversion single-photon detecting examining system on the high sensitivity according to claim 2, it is characterized in that: described periodically poled lithium niobate waveguide (2) is placed in the semiconductor temperature-control device, be pasted with thermopair and refrigeration module on the semiconductor temperature-control device, the output terminal of thermopair links to each other with the signal input part of controller, and the signal output part of controller links to each other with the refrigeration module.
5. conversion single-photon detecting examining system on the high sensitivity according to claim 3, it is characterized in that: described filter is made up of low pass filters (7), high permeability coherent filtering sheet (8) and diaphragm (9), and low pass filters (7), high permeability coherent filtering sheet (8), diaphragm (9) are placed between first microcobjective (6) and second microcobjective (10) successively.
6. conversion single-photon detecting examining system on the high sensitivity according to claim 5, it is characterized in that: described periodically poled lithium niobate waveguide (2), first microcobjective (6), low pass filters (7), high permeability coherent filtering sheet (8), diaphragm (9), second microcobjective (10) and avalanche silicon diode single-photon detector (11) are positioned on the same central horizontal axis.
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| CN2011100989551A CN102243107A (en) | 2011-04-20 | 2011-04-20 | High-sensitivity up-conversion single photon detection system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090971A (en) * | 2013-01-24 | 2013-05-08 | 中国科学院空间科学与应用研究中心 | Ultra-sensitive time resolution imaging spectrometer and time resolution imaging method thereof |
| CN105762615A (en) * | 2016-04-25 | 2016-07-13 | 天津大学 | Single frequency fiber laser mode jump monitoring system based on single-photon detection |
| CN104426602B (en) * | 2013-08-27 | 2017-08-29 | 张强 | A kind of fiber optical time domain reflection instrument |
| CN107485359A (en) * | 2017-09-21 | 2017-12-19 | 王俊铎 | Diagnostor is peeped in a kind of clinical medicine |
| CN107548453A (en) * | 2015-02-06 | 2018-01-05 | 生命技术公司 | System and method for evaluating biological specimen |
| CN108375774A (en) * | 2018-02-28 | 2018-08-07 | 中国科学技术大学 | A kind of single photon image detecting laser radar of no-raster |
| CN109521282A (en) * | 2018-11-16 | 2019-03-26 | 中国电子科技集团公司第三十九研究所 | Microwave list quantum detector based on Microwave Optics modulator |
| CN110411586A (en) * | 2018-04-28 | 2019-11-05 | 山东量子科学技术研究院有限公司 | Single-photon detector is converted in a kind of miniaturization |
| CN112985596A (en) * | 2021-01-26 | 2021-06-18 | 济南量子技术研究院 | 10.6 mu m single photon detector based on frequency up-conversion and performance test experimental device thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149288A (en) * | 2007-11-14 | 2008-03-26 | 华东师范大学 | Highly effective infrared single photon detection method |
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2011
- 2011-04-20 CN CN2011100989551A patent/CN102243107A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149288A (en) * | 2007-11-14 | 2008-03-26 | 华东师范大学 | Highly effective infrared single photon detection method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090971A (en) * | 2013-01-24 | 2013-05-08 | 中国科学院空间科学与应用研究中心 | Ultra-sensitive time resolution imaging spectrometer and time resolution imaging method thereof |
| CN104426602B (en) * | 2013-08-27 | 2017-08-29 | 张强 | A kind of fiber optical time domain reflection instrument |
| CN107548453A (en) * | 2015-02-06 | 2018-01-05 | 生命技术公司 | System and method for evaluating biological specimen |
| US11920191B2 (en) | 2015-02-06 | 2024-03-05 | Life Technologies Corporation | Systems and methods for assessing biological samples |
| CN105762615A (en) * | 2016-04-25 | 2016-07-13 | 天津大学 | Single frequency fiber laser mode jump monitoring system based on single-photon detection |
| CN105762615B (en) * | 2016-04-25 | 2019-02-22 | 天津大学 | A kind of single frequency optical fiber laser mode hopping monitoring system based on single photon detection |
| CN107485359A (en) * | 2017-09-21 | 2017-12-19 | 王俊铎 | Diagnostor is peeped in a kind of clinical medicine |
| CN108375774A (en) * | 2018-02-28 | 2018-08-07 | 中国科学技术大学 | A kind of single photon image detecting laser radar of no-raster |
| CN110411586A (en) * | 2018-04-28 | 2019-11-05 | 山东量子科学技术研究院有限公司 | Single-photon detector is converted in a kind of miniaturization |
| CN109521282A (en) * | 2018-11-16 | 2019-03-26 | 中国电子科技集团公司第三十九研究所 | Microwave list quantum detector based on Microwave Optics modulator |
| CN112985596A (en) * | 2021-01-26 | 2021-06-18 | 济南量子技术研究院 | 10.6 mu m single photon detector based on frequency up-conversion and performance test experimental device thereof |
| CN112985596B (en) * | 2021-01-26 | 2022-12-23 | 济南量子技术研究院 | 10.6 mu m single photon detector based on frequency up-conversion and performance test experimental device thereof |
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Application publication date: 20111116 |