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Author Vartapetov, S. K. ♦ Ganin, D. V. ♦ Lapshin, K. E. ♦ Obidin, A. Z.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ASPECT RATIO ♦ BEAMS ♦ BIOLOGICAL MATERIALS ♦ CRYSTALS ♦ CUTTING ♦ DIELECTRIC MATERIALS ♦ FOCUSING ♦ GLASS ♦ LASER RADIATION ♦ OPHTHALMOLOGY ♦ POLYCARBONATES ♦ PULSES ♦ REFRACTIVE INDEX ♦ SILICA ♦ SURFACES
Abstract We report the results of the experiments on developing precision micromachining technology, obtained under the conditions of focusing the pulses of a femtosecond (FS) laser into the volume of a transparent material, which is important, particularly, in the processing of biomaterials in ophthalmology. The implementation conditions and some characteristic features of the special regime of micromachining are determined, when at a definite relation between the sample scanning velocity and the repetition rate of FS pulses the region, destroyed by the laser radiation, is shifted along the optical axis towards the objective and back, forming cyclic patterns inside the sample. It is supposed that the main causes of the damage region shift are the induced modification of the refractive index and the reduction of the damage threshold due to the change in the material density and structure in the microscopic domain, adjacent to the boundary of the cavity produced by the previous pulse. The results of the performed study with the above regime taken into account were used in the technology of precision cutting of crystals, glasses and polymers. The best quality of the cut surface is achieved under the conditions, eliminating the appearance of the cyclic regime. In the samples of polycarbonate, polymethyl methacrylate and fused silica the cylindrical cavities were obtained with the aspect ratio higher than 200, directed along the laser beam, and microcapillaries with the diameter 1 – 2 μm in the direction, perpendicular to this beam. (interaction of laser radiation with matter)
ISSN 10637818
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-08-31
Publisher Place United States
Journal Quantum Electronics
Volume Number 45
Issue Number 8


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