INTERNAL PROCESSING OF LIGHT ABSORPTION MEDIUM BY USE OF SELF-FOCUS INDUCED BY ULTRASHORT PULSE LASER AND ANALYSIS OF PROCESSING PHENOMENA

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The beam diameter, the beam profile and the transmittance of an ultrashort pulse laser propagating in a transparent medium were measured. The optical analysis was performed by considering the beam propagation, the self-focusing and the nonlinear absorption of ultrashort pulse laser in a Kerr medium. Comparing with the experimental results, the nonlinear absorption coefficients of BK7 and fused silica were calculated. Furthermore, the internal processing and the lap welding of glass were conducted with an ultrashort pulse laser. Using the measurement results of the absorption ratio in the inside of glass, heat conduction analysis was carried out, and the processing mechanism was discussed.