Abstract
We report on a home-made high-energy hundred-picosecond fiber-solid hybrid laser system, which consists of a high-stability all-fiber seed source and a high-energy quasi-continuous-wave laser diode side-pumped Nd:YAG regenerative amplifier. With this system, pulse energy of 4 mJ and pulse duration of 302 ps have been achieved at 500 Hz repetition rate. The high-energy picosecond pulses of this laser amplifier are used for the experiments of laser-induced damage in the PIN photodiode. Detection signals and damage morphologies in the damage process have been observed and studied. The failure threshold of 26 GW cm−2 has been obtained under 1.82 mJ laser irradiation. In addition, the density distribution of laser-induced plasma has been simulated based on hydrodynamics theory, which is consistent with the experimental results. Damage behavior indicates that surface damage of the PIN photodiode can be analyzed by deep melting transients and plasma motion. This scheme takes advantage of the combination of fiber and solid laser to achieve efficient and stable energy amplification of picosecond pulses, which provides a better laser irradiation source for studying thermal and plasma damage of laser-induced damage in the PIN photodiode.
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