Multiple refocusing characterization and critical power measurement using third harmonic generation at interface
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- Liang, F., Sun, Q., Vallée, R. et al. Appl. Phys. B (2010) 99: 235. doi:10.1007/s00340-009-3822-3
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We have studied multiple refocusing in fused silica and measured the critical power for self-focusing using third harmonic generation at an air/glass interface. The third harmonic energy as a function of geometrical focal position obtained at different input energies provides much information, such as the critical power for self-focusing, intensity clamping during filamentation, and evolution of multiple refocusing filaments.