Recently, it was learned from the Chinese Academy of Metrology that the national “Eleventh Five-Year†scientific and technological support project undertaken by the Institute “Research on the establishment of photoelectric detector quantum efficiency measurement devices using related photon measurement technology†has recently passed the acceptance of experts. The entangled photon detector quantum efficiency absolute calibration device independently developed by the project successfully extended the range capability of China's optical radiation power measurement to the photon level, and redefine the candela (cd) value of one of the international basic units for the number of photons Recurring research has laid an important foundation.
The successful development of this subject has shortened the gap between China and developed countries in the realization of benchmark research on the power of optical radiation based on quantum physics; at the same time, it is used to study quantum information, biomedicine, sky detectors, astrophysics, environmental science and other fields The photon detection technology involved in provides the technical support for photon level measurement.
According to Lu Liang, the person in charge of the subject and the Institute of Optics of the Chinese Institute of Metrology, the subject lasted 4 years. On the basis of theoretical calculations, the phase matching parameters of nonlinear crystals were determined, and the wavelength and space of entangled photon pairs were derived through the phase matching conditions. Distribution calculation method; solved the core technical problems such as optical path design, photon detection, conformance measurement system design, coincidence width setting, accidental coincidence measurement method, dark count measurement method, etc., and realized Type-I phase matching related photon field in the actual device And established a photoelectric detector quantum efficiency measurement device based on related photons. The uncertainty of the quantum efficiency measurement of the photomultiplier tube device of this device is 0.7%, reaching the international advanced level.
Lu Liang introduced that the method of calibrating photodetectors based on spontaneous parameter down-conversion related photon method, in addition to being a brand-new optical radiation measurement method, has its own special technical advantages. First, the traditional methods of measuring the quantum efficiency and even the responsivity of the detector rely on the accurate measurements of standard lamps or lasers. The correlation photon method does not depend on any base standardizer, and the transfer process of its value completely realizes the calibration without traceability. The second is that the device can be directly applied to the calibration services in the fields of bioluminescence, medical instruments, laser long-distance detection, etc., providing high-accuracy quantum measurement technology for research in the field of new technologies. The third is that the related photon method for developing the device is directly related to quantum key, tunable laser and other technologies, and is the technical basis for the preparation of single photon source.
Pvc Horse Fence,Vinyl Ranch Fence,Black Pvc Horse Fence,3 Rail Vinyl Horse Fence
ZHEJIANG DEQING GONAT FENCE CO.,LTD , https://www.gonatpvcfence.com