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Method for Measuring Optical Second-Order Correlation Function Based on Single Photon Detector

A single-photon detector and second-order correlation technology, which is applied in photometry, photometry, and optical radiation measurement using electric radiation detectors, can solve the problems of incomplete acquisition of second-order correlation functions and high cost, and achieve structural Simple, high counting efficiency, and wide application range

Active Publication Date: 2022-07-19
ZHEJIANG UNIV
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Problems solved by technology

The currently existing schemes in the world that use a single detector to measure the second-order correlation function need to use ultra-short "dead time" and low "afterpulse" detectors, which are very expensive, and still cannot completely obtain the second-order correlation function within the "dead time". order correlation function

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  • Method for Measuring Optical Second-Order Correlation Function Based on Single Photon Detector
  • Method for Measuring Optical Second-Order Correlation Function Based on Single Photon Detector
  • Method for Measuring Optical Second-Order Correlation Function Based on Single Photon Detector

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Embodiment Construction

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like figure 1 Shown is a schematic diagram of the structure principle of the present invention. The present invention uses a beam splitter to divide the beam to be measured into two paths and couple them into two paths of single-mode fibers respectively, and the beam splitting ratio of the beam splitter is 50%:50% . The optical fiber length of optical path 2 is longer than that of optical path 1; in this embodiment, the difference in the length of the two optical fibers is about 80 m, which is equivalent to an optical delay (Δt) of 373 ns.

[0020] The two beams of light emerging from the fiber are collimated by a 90° blade mirror to be parallel to each other, and then focused and measured with a single commercial single-photon detector. The typical "dead time" of the single-photon detector used in this example is 22ns, and the "post-pulse" range...

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Abstract

The invention discloses a method for measuring photon second-order correlation function based on a single single photon detector. The optical signal to be measured is divided into two paths, and a long optical delay is introduced into one of the optical paths, so that the information of the second-order correlation function at the zero delay is retained and shifted to the corresponding time delay, avoiding the need for The "dead time" and "post-pulse" problems of a single single-photon detector, so that the second-order correlation function value can be accurately obtained. It can currently be used to detect the emission purity of single-photon sources, and the system cost is more than 30% lower than the traditional method using two detectors.

Description

technical field [0001] The invention relates to an optical correlation test technology method, in particular to a second-order correlation function test method based on a single detector. Background technique [0002] Optical second-order correlation function test is a test method that occupies an important position in the fields of single-molecule spectroscopy, quantum optics and quantum information technology. [0003] In the traditional test scheme, the optical signal to be measured must be divided into two beams, and two detectors are used to detect the two optical signals respectively, and then the cross-correlation calculation is performed on the photon detection event, so as to avoid the "dead" of the single-photon detector. time" and "post-pulse" issues. The selling price of single-photon detectors is in the range of tens of thousands to hundreds of thousands per unit. Obviously, the solution of using two detectors greatly increases the system cost. The current int...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00G01J1/44G01J1/08G01J1/04
CPCG01J11/00G01J1/44G01J1/08G01J1/0425G01J2001/442
Inventor 林星刘少杰
Owner ZHEJIANG UNIV
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