Research On Wide-waveband Photon Detection Technology And Application

Single photon detection technology belongs to weak light detection and has a wide range of applications in high-resolution spectral measurement,bioluminescence,quantum information and other fields.Accurately grasping the quantum efficiency of a single photon detector is a condition to ensure its good application.In the calibration process of a single photon detector,the traditional method needs to use a standard radiation source or a standard detector as a reference standard,which will lead to an increase in the uncertainty of the calibration result.Correlation photon-based calibration methods do not rely on any reference standards and transfer chains,which provides a new direction for detector calibration.With the expansion of the application field of single-photon detectors,the coverage band is continuously increasing.In order to meet the needs of the calibration of quantum efficiency of detectors in different bands,it is of great significance to study the detector measurement system based on the adjustable photon source associated with the band.This paper focuses on the research of wideband photon detection technology and calibration applications,and designs a quantum efficiency measurement system based on the wideband correlation photon source of BBO crystal.Key problems such as BBO crystal parameter design,band adjustment system design,associated photon optical path configuration,and measurement system design and optimization were solved,and a quantum efficiency measurement experiment based on a band-tunable correlated photon source was completed.Associated photon sources with wavelengths of 1550 nm and 460 nm and 1310 nm and 487 nm were prepared using BBO crystals,the reference channels and the number of photons corresponding to the channels were obtained,the experimental data was analyzed,and the quantum efficiency of the detector to be measured at the wavelength of 1550 nm was 9.28% and the deviation from the factory data at the corresponding wavelength is 0.72%,the uncertainty is 2.92%.The quantum efficiency of the detector at the wavelength of 1310 nm is measured and calculated to be 11.35% and the deviation from the factory data at the corresponding wavelength is 0.65%,the uncertainty is 2.74%.The experimental results are in good agreement with the data provided by the detector manufacturers,which verifies the feasibility of the method and lays the foundation for further research on high-precision wide-band quantum efficiency measurement systems.At the same time,we also designed a highly efficient correlated photon source with adjustable bands based on the PPLN crystal temperature tuning method.The light source is a high-power laser with a wavelength of 532 nm,and the polarization period of the PPLN crystal is 7.4 ?m.The temperature tuning curve was calculated.At 118 ° C tuning temperature,correlated photon pairs of 1550 nm and 810 nm were generated.Through the established experimental system,the preliminary measurement results of the reference optical channel and the conforming channel were obtained,and the quantum efficiency of the detector to be calibrated was calculated to be 8.9%.In addition,compared with a photon source using a BBO crystal,the coincidence count of the associated photon source at the same wavelength position is about four times that of the photon source.It shows that the system has higher conversion efficiency,and provides a solution for the further development of high-brightness and wide-band quantum efficiency measurement technology.