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A superconducting nanowire single-photon detection system in the mid-infrared band

A superconducting nanowire and single-photon detection technology, which is applied in photometry, optical radiation measurement, photometry using electric radiation detectors, etc., can solve problems such as the inability to apply mid-infrared wavelengths, and achieve system detection efficiency. The effect of high-efficiency absorption

Active Publication Date: 2021-11-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. There is currently no vacuum feedthrough device for mid-infrared optical fibers on the market, so the test system first needs to achieve vacuum-sealed lossless transmission of mid-infrared fibers;
[0006] 2. The optical cavity structure currently used in the near infrared cannot be applied to the mid-infrared wavelength, so the detector chip needs to redesign the optical cavity structure for the mid-infrared to achieve high-efficiency light absorption in the mid-infrared;

Method used

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  • A superconducting nanowire single-photon detection system in the mid-infrared band
  • A superconducting nanowire single-photon detection system in the mid-infrared band
  • A superconducting nanowire single-photon detection system in the mid-infrared band

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Embodiment 1

[0040] The overall technical solution of the superconducting nanowire single-photon detection system for mid-infrared wavelengths is divided into the following aspects:

[0041] The first technology is to build an overall test system for mid-infrared wavelengths, focusing on the realization of the fiber vacuum penetration seal design for mid-infrared wavelengths, to achieve lossless transmission of mid-infrared optical fibers connected to high vacuum and ultra-low temperature environments; the second technology is for mid-infrared wavelengths. The optical design and simulation of the device realize the high-efficiency absorption of the detector at the mid-infrared wavelength; the third technology is the self-alignment packaging of the detector chip at the mid-infrared wavelength to realize the high coupling efficiency of the detector at the mid-infrared wavelength. Describe in detail below in conjunction with accompanying drawing:

[0042] Technology 1: The overall test system...

Embodiment 2

[0048] 1. Design of vacuum feed-through sealer for mid-infrared optical fiber

[0049] At present, the size of the vacuum joint used in the refrigerator system is a clamp type blind plate sealing KF25 interface, so the KF25 interface is taken as an example to make a vacuum sealer for the mid-infrared optical fiber. First of all, the two ends of the mid-infrared optical fiber used in the system are FC / PC interfaces, and the outer diameter of the protective layer of the optical fiber is 2mm, and the protective layer of the optical fiber is not sealed after testing.

[0050] Therefore, the current method is to first punch a 11 mm diameter through hole on the KF25 blind plate, so that the fc / pc port of the mid-infrared fiber can pass through, and then peel off the outer protective layer of the mid-infrared fiber at the through hole to expose the mid-infrared fiber coating layer. Then dig a 2mm deep groove on the edge of a flexible sealing rubber plug with a diameter of 12mm, plac...

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Abstract

The invention discloses a superconducting nanowire single-photon detection system in the mid-infrared band, comprising: the emitted light of the mid-infrared laser is coupled to the mid-infrared optical fiber through a lens; the mid-infrared optical fiber is connected to a G-M refrigerator through a vacuum sealer, And insert it into the ceramic sleeve of the chip packaging device; the chip packaging device is placed in a high-vacuum G-M refrigerator and cooled to the liquid helium temperature zone; the voltage source passes through a 100kΩ resistor, a DC terminal of a T-shaped bias The axial cable provides bias current for the superconducting nanowire single photon detector; the electric pulse generated after the superconducting nanowire single photon detector detects photons passes through the coaxial cable, the RF end of the T-shaped biaser and the amplifier, and then accesses the counter or oscilloscope, read the probe signal on a counter or oscilloscope. The invention provides a method for realizing a lossless mid-infrared optical fiber vacuum sealer, improves the system detection efficiency of superconducting nanowire single-photon detectors at mid-infrared wavelengths, and expands the application wavelength of superconducting nanowire single-photon detectors .

Description

technical field [0001] The invention relates to the field of optoelectronic devices, in particular to a superconducting nanowire single-photon detection system in the mid-infrared band. Background technique [0002] At present, superconducting nanowire single photon detectors (SNSPDs) have become the best single photon detectors in the near-infrared field, with high efficiency (93% system detection efficiency at 1550nm wavelength), low time domain jitter (less than 20 pico seconds), low dark count rate (1 per second) and other excellent performance. The system detection efficiency of superconducting nanowires refers to the product of the coupling efficiency of the incident light to the device, the absorption efficiency of the device to the incident light, and the intrinsic internal quantum efficiency of the device, and the detection efficiency of the device is the absorption of the incident light by the device The product of the efficiency and the intrinsic quantum efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42G01J1/44G01J11/00
CPCG01J1/42G01J1/44G01J11/00G01J2001/4238G01J2001/442
Inventor 胡小龙许亮邹锴孟赟兰潇健王昭胡南曹许慧
Owner TIANJIN UNIV
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