Forward degenerate four-wave mixing based isotope detection method with ultrahigh sensitivity

Abstract

The invention discloses an isotope detection method based on FDFWM spectrum technology: dividing a beam of laser light into three beams of light with equal optical paths; adjusting the spatial positions of the three beams of light; focusing the three beams of light, and the three beams of light The FDFWM signal is generated by the interaction of the isotope sample to be measured at the point; the center frequency of the laser is scanned, and the FDFWM signal of the isotope sample to be measured is measured with a photodetector to obtain the FDFWM signal spectrum in which the FDFWM signal changes with the center frequency of the laser; Measure the content information of isotopic samples. The method of the invention can improve the sensitivity of isotope detection and realize near-nondestructive detection. Using the method of the invention to detect isotopes can reduce the detection limit and the amount of sampling, and the equipment is relatively simple, easy to operate, and has ultra-high sensitivity and detection accuracy .

Description

technical field [0001] The invention belongs to the category of nonlinear spectroscopy technology, and relates to an isotope detection method, in particular to an ultrahigh-sensitivity isotope detection method based on forward degenerate four-wave mixing (FDFWM). Background technique [0002] Isotope analysis has important applications in geology, archaeology, nuclear technology, biomedical tracing, environmental science and other fields. Isotope analysis is a major method for dating rocks and geological events. With the help of U-Pb, K-Ar, Rb-Sr and some other isotopes used for age determination, it provides a time-series study of geological events or processes. data of. Similarly, isotope dating technology also has obvious significance in archeology, such as: C-14 dating method, Pb isotope ratio method to measure the age of cultural relics and the method of origin. In the nuclear industry, people monitor the burnup in the nuclear fuel cycle by analyzing the identificatio...

AI Technical Summary

Problems solved by technology

However, mass spectrometry has many shortcomings, such as high cost, complicated sample pretreatment, and long detection time.

Mass spectrometry consumes a large amount of sample (microgram level), which makes it far from meeting the requirements of non-destructive and near-non-destructive testing, such as precious cultural relics, etc.

Another fatal flaw of mass spectrometry is isobaric element interference, which makes many isotopes unable to be resolved (Dominic Lariviere, Vivien F. Taylor, R. Douglas Evans, R. Jack Cornett. Spectrochimica. Acta Part B 2006, 61 877.)

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