Diamond detection using coherent anti-stokes raman spectroscopy

Details Diamond detection using coherent anti-stokes raman spectroscopy Diamond detection using coherent anti-stokes raman spectroscopy

G - Physics

01

N

G01N 21/87 (2006.01) G01J 3/44 (2006.01) G01N 21/65 (2006.01)

Patent

CA 2418858

The invention concerns a method and apparatus for detecting diamonds using the phenomenon of coherent anti-Stokes Raman spectroscopy (CARS). Each particle (46) which is to be analysed is irradiated by a focused particle irradiating beam (44) of laser light formed by combining initial laser beams (35, 36) having frequencies differing from one another by a value characteristic for diamond. Components of the initial laser beams are coherently phase-matched to produce, in diamond particles, a CARS signal characteristic of diamond. The scattered signal from the particle is then collected and analysed for the presence of the characteristic CARS signal. The irradiating beam and/or at least one of the initial laser beams is focused by a lens system including a cylindrical lens. This feature has been found to give an enhanced result compared to conventional CARS analysis.

L'invention concerne un procédé et un appareil permettant de détecter des diamants par spectroscopie Raman anti-Stokes cohérente (CARS). Chaque particule (46) à analyser est irradiée au moyen d'un faisceau d'irradiation (44) de particules focalisé de lumière laser formé par combinaison de faisceaux laser (35, 36) initiaux possédant des fréquences différant les unes des autres d'une caractéristique de valeur pour un diamant. Les composants des faisceaux laser sont adaptés en phase de manière cohérente afin de produire une caractéristique de signal CARS du diamant dans les particules dudit diamant. Le signal dispersé à partir des particules est ensuite collecté et analysé afin de déterminer la présence du signal de caractéristique CARS. Le faisceau d'irradiation et/ou au moins le faisceau laser initial est focalisé au moyen d'un système de lentille comprenant une lentille cylindrique. On a découvert que cette caractéristique permettait d'améliorer les résultats par rapport à une analyse CARS classique.

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