METHOD FOR INFORMATION RECORDING INSIDE DIAMOND CRYSTAL Russian patent published in 2021 - IPC C30B29/04 C30B33/04 C01B32/28 G09F3/00 B23K26/622 B23K26/64 B23K26/66 B23K26/67 B23K26/08 B23K26/53 B28D5/00 B44B3/00 G01N21/64 G01N21/65 G01N21/87 A44C17/00 

FIELD: information recording.

SUBSTANCE: invention relates to technology of creating images inside diamonds carrying information for various purposes, for example, identification code or diamond identifying marks. Method for information recording inside diamond crystal 1 includes information element projection in the form of a mark using device 10, crystal surface preparation, crystal positioning using means 2, 5, 6, 7, 8, 9 for creating information element, information element formation by exposing crystal to laser 11 radiation, control of information element creation and information element adjustment. Diamond crystal 1 is previously marked up into brilliants. Crystal is examined for macroscopic defects. The volumetric digital model of crystal is created taking into account crystal internal defectiveness, including surface topology. Information element projection is performed in such a way that it is placed in the required place of the future brilliant. Information element recorded inside crystal volume is virtually bound, positioned and oriented relatively to cut elements of the future brilliants. After the projection, trajectory of rays 12 is calculated, parameters are set including dimensions and geometry of radiation focal area by selecting radiation application points, the ray is divided into parts in device 16, all ray parts are set up at different angles, the part of the ray profile is disguised. Based on the calculation, integral fluence is selected in a recording place below the threshold fluence, at which local transformation of diamond into graphite or other non-diamond shape of carbon is occurred or cracks and splits are formed in the crystal. The crystal surface preparation is performed. When positioning a crystal, its three-dimensional model is combined with its real location. The information element formation is performed by lens system 19 by creation of interference field inside crystal 1 by intersection of two or more beams of laser coherent radiation with ultrashort pulses with duration of 30 fs to 10 ps and energy of 1 nJ to 40 mcJ with wavelength of 240 to 2200 nm leading to the occurrence of submicron periodic structures in the recorded area. After that, the control of information element creation is performed by device 21 based on crystal surface topology by calculation of ray course and their refraction for accurate information element positioning for eliminating the effect of apparent change in information element position and shape.

EFFECT: proposed are information element recording in form of a mark both entirely and elementwise, an increase in depth, locality and, accordingly, density of recording inside crystals, as well as reliability of creation of optically permeable image inside crystals with different content of atomic and microscopic defects and its following detection.

45 cl, 6 dwg