Using a picosecond laser that delivers bursts of ultrashort pulses may improve thermal effects and limit side effects, compared to a sub-nanosecond laser. This study aims to analyse how the temperature increases on agar with or without black ink and on human skin. Results showed that large beams, and so long macropulses, present higher peaks of temperature than the small ones, as well as when fluencies and frequencies increase. Besides, higher thermal loading occurred with the nanosecond pulses. These results may explain why picosecond laser induces less side effects than sub-nanosecond laser.
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