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Structure of single photon detecting element

A single-photon detection, hollow technology, applied in the direction of instruments, etc., can solve the problems of inconvenient replacement of components, small temperature range, inability to change temperature, etc., to achieve the effect of easy maintenance, simple replacement, and simple installation

Inactive Publication Date: 2008-05-28
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The limitations of semiconductor refrigerators are: the temperature range is small, especially the low temperature cannot be lower than -50°C, which is difficult to meet the needs of laboratory research; in order to ensure the stability of temperature control and avoid condensation, the entire device needs to be packaged in a vacuum environment, which is inconvenient Replacement components
The limitations of liquid nitrogen dewars are: generally only with optical windows, samples with pigtails cannot be installed, and the sample chamber also needs to be vacuumed; or simply immerse the sample in liquid nitrogen, and the temperature cannot be changed

Method used

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  • Structure of single photon detecting element
  • Structure of single photon detecting element

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Embodiment

[0052] Such as figure 2 As shown, the tie rod structure 21 is placed in the liquid nitrogen Dewar, and the insertion depth is adjusted so that the plastic insulation plug is closely combined with the inner wall of the Dewar, and the tie rod is fixed by the flange. In this way, the inner cavity of the liquid nitrogen Dewar is divided into two parts by the heat insulation plug: the liquid nitrogen compartment 24 for storing liquid nitrogen; and the sample compartment 26 in which the avalanche diode is placed. A vacuum heat insulation layer 25 is formed on the periphery of the sample chamber 26 by using the air suction port 23 with a sealed air valve to draw air. A proper amount of liquid nitrogen is injected into the liquid nitrogen cabin 24 through the liquid nitrogen injection port 22 . The spiral groove on the surface of the thermal insulation plug becomes the main way for the air enclosed in the sample compartment 26 to exchange heat with the liquid nitrogen in the liquid ...

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Abstract

The single proton detecting device has liquid nitrogen refrigerated avalanche diode with tail fiber and has the structure including mainly one hollow heat insulating plastic plug; one hollow pull rod with one end connected to the hollow heat insulating plastic plug; one avalanche diode fixed to the other end of the hollow heat insulating plastic plug; one metal sleeve set inside the hollow pull rod; one screwed flange fixed to the other end of the hollow pull rod; one electric cable terminal fixed to the other end of the screwed flange; and one single-mode fiber held inside the metal sleeve and with one end fixed to the avalanche diode and the other end leading out via the screwed flange.

Description

technical field [0001] The invention relates to a single photon detection device, which uses a tie rod structure to install an avalanche diode with a pigtail in a liquid nitrogen Dewar, which can respond to an incident light signal containing only a single photon; it can be used for weak light signal measurement , and laboratory research on quantum information and quantum key transmission. Background technique [0002] Because of its sensitivity to extremely weak light signals, single-photon detection technology has a wide range of applications: such as observing sample fluorescence in biology, observing weak light signals in aerospace, and research on semiconductor materials. In particular, quantum information and quantum key transmission, in which information is encoded on a single photon in an entangled state, is currently attracting widespread interest. [0003] As a detection element, an avalanche diode works in a reverse breakdown state. Once triggered by a single pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 刘伟杨富华曾宇昕郑厚植
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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